Improve process API

Prefix symbols and constants names and improve documentation.

README.md

@@ -582,6 +582,14 @@ scrcpy --turn-screen-off --stay-awake
 scrcpy -Sw
 ```
 
+#### Power off on close
+
+To turn the device screen off when closing scrcpy:
+
+```bash
+scrcpy --power-off-on-close
+```
+
 
 #### Show touches
 
@@ -838,6 +846,8 @@ _<kbd>[Super]</kbd> is typically the <kbd>Windows</kbd> or <kbd>Cmd</kbd> key._
  | Inject computer clipboard text              | <kbd>MOD</kbd>+<kbd>Shift</kbd>+<kbd>v</kbd>
  | Enable/disable FPS counter (on stdout)      | <kbd>MOD</kbd>+<kbd>i</kbd>
  | Pinch-to-zoom                               | <kbd>Ctrl</kbd>+_click-and-move_
+ | Drag & drop APK file                        | Install APK from computer
+ | Drag & drop non-APK file                    | [Push file to device](#push-file-to-device)
 
 _¹Double-click on black borders to remove them._  
 _²Right-click turns the screen on if it was off, presses BACK otherwise._  

app/meson.build

@@ -24,18 +24,27 @@ src = [
     'src/server.c',
     'src/stream.c',
     'src/video_buffer.c',
+    'src/util/file.c',
     'src/util/log.c',
     'src/util/net.c',
     'src/util/process.c',
+    'src/util/strbuf.c',
     'src/util/str_util.c',
+    'src/util/term.c',
     'src/util/thread.c',
     'src/util/tick.c',
 ]
 
 if host_machine.system() == 'windows'
-    src += [ 'src/sys/win/process.c' ]
+    src += [
+        'src/sys/win/file.c',
+        'src/sys/win/process.c',
+    ]
 else
-    src += [ 'src/sys/unix/process.c' ]
+    src += [
+        'src/sys/unix/file.c',
+        'src/sys/unix/process.c',
+    ]
 endif
 
 v4l2_support = host_machine.system() == 'linux'
@@ -186,7 +195,9 @@ if get_option('buildtype') == 'debug'
             'tests/test_cli.c',
             'src/cli.c',
             'src/options.c',
+            'src/util/strbuf.c',
             'src/util/str_util.c',
+            'src/util/term.c',
         ]],
         ['test_clock', [
             'tests/test_clock.c',
@@ -195,6 +206,7 @@ if get_option('buildtype') == 'debug'
         ['test_control_msg_serialize', [
             'tests/test_control_msg_serialize.c',
             'src/control_msg.c',
+            'src/util/strbuf.c',
             'src/util/str_util.c',
         ]],
         ['test_device_msg_deserialize', [
@@ -204,8 +216,13 @@ if get_option('buildtype') == 'debug'
         ['test_queue', [
             'tests/test_queue.c',
         ]],
+        ['test_strbuf', [
+            'tests/test_strbuf.c',
+            'src/util/strbuf.c',
+        ]],
         ['test_strutil', [
             'tests/test_strutil.c',
+            'src/util/strbuf.c',
             'src/util/str_util.c',
         ]],
     ]

app/scrcpy.1

@@ -136,6 +136,10 @@ Set the TCP port (range) used by the client to listen.
 
 Default is 27183:27199.
 
+.TP
+.B \-\-power\-off\-on\-close
+Turn the device screen off when closing scrcpy.
+
 .TP
 .B \-\-prefer\-text
 Inject alpha characters and space as text events instead of key events.
@@ -364,6 +368,10 @@ Pinch-to-zoom from the center of the screen
 .B Drag & drop APK file
 Install APK from computer
 
+.TP
+.B Drag & drop non-APK file
+Push file to device (see \fB\-\-push\-target\fR)
+
 
 .SH Environment variables
 

app/src/adb.c

@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "util/file.h"
 #include "util/log.h"
 #include "util/str_util.h"
 
@@ -68,7 +69,7 @@ show_adb_installation_msg() {
         {"pacman", "pacman -S android-tools"},
     };
     for (size_t i = 0; i < ARRAY_LEN(pkg_managers); ++i) {
-        if (search_executable(pkg_managers[i].binary)) {
+        if (sc_file_executable_exists(pkg_managers[i].binary)) {
             LOGI("You may install 'adb' by \"%s\"", pkg_managers[i].command);
             return;
         }
@@ -80,7 +81,7 @@ show_adb_installation_msg() {
 }
 
 static void
-show_adb_err_msg(enum process_result err, const char *const argv[]) {
+show_adb_err_msg(enum sc_process_result err, const char *const argv[]) {
 #define MAX_COMMAND_STRING_LEN 1024
     char *buf = malloc(MAX_COMMAND_STRING_LEN);
     if (!buf) {
@@ -89,18 +90,18 @@ show_adb_err_msg(enum process_result err, const char *const argv[]) {
     }
 
     switch (err) {
-        case PROCESS_ERROR_GENERIC:
+        case SC_PROCESS_ERROR_GENERIC:
             argv_to_string(argv, buf, MAX_COMMAND_STRING_LEN);
             LOGE("Failed to execute: %s", buf);
             break;
-        case PROCESS_ERROR_MISSING_BINARY:
+        case SC_PROCESS_ERROR_MISSING_BINARY:
             argv_to_string(argv, buf, MAX_COMMAND_STRING_LEN);
             LOGE("Command not found: %s", buf);
             LOGE("(make 'adb' accessible from your PATH or define its full"
                  "path in the ADB environment variable)");
             show_adb_installation_msg();
             break;
-        case PROCESS_SUCCESS:
+        case SC_PROCESS_SUCCESS:
             // do nothing
             break;
     }
@@ -108,16 +109,15 @@ show_adb_err_msg(enum process_result err, const char *const argv[]) {
     free(buf);
 }
 
-process_t
+sc_pid
-adb_execute_redirect(const char *serial, const char *const adb_cmd[],
+adb_execute_p(const char *serial, const char *const adb_cmd[],
-                     size_t len, pipe_t *pipe_stdin, pipe_t *pipe_stdout,
+              size_t len, sc_pipe *pin, sc_pipe *pout, sc_pipe *perr) {
-                     pipe_t *pipe_stderr) {
     int i;
-    process_t process;
+    sc_pid pid;
 
     const char **argv = malloc((len + 4) * sizeof(*argv));
     if (!argv) {
-        return PROCESS_NONE;
+        return SC_PROCESS_NONE;
     }
 
     argv[0] = get_adb_command();
@@ -131,24 +131,23 @@ adb_execute_redirect(const char *serial, const char *const adb_cmd[],
 
     memcpy(&argv[i], adb_cmd, len * sizeof(const char *));
     argv[len + i] = NULL;
-    enum process_result r =
+    enum sc_process_result r =
-        process_execute_redirect(argv, &process, pipe_stdin, pipe_stdout,
+        sc_process_execute_p(argv, &pid, pin, pout, perr);
-                                 pipe_stderr);
+    if (r != SC_PROCESS_SUCCESS) {
-    if (r != PROCESS_SUCCESS) {
         show_adb_err_msg(r, argv);
-        process = PROCESS_NONE;
+        pid = SC_PROCESS_NONE;
     }
 
     free(argv);
-    return process;
+    return pid;
 }
 
-process_t
+sc_pid
 adb_execute(const char *serial, const char *const adb_cmd[], size_t len) {
-    return adb_execute_redirect(serial, adb_cmd, len, NULL, NULL, NULL);
+    return adb_execute_p(serial, adb_cmd, len, NULL, NULL, NULL);
 }
 
-process_t
+sc_pid
 adb_forward(const char *serial, uint16_t local_port,
             const char *device_socket_name) {
     char local[4 + 5 + 1]; // tcp:PORT
@@ -159,7 +158,7 @@ adb_forward(const char *serial, uint16_t local_port,
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-process_t
+sc_pid
 adb_forward_remove(const char *serial, uint16_t local_port) {
     char local[4 + 5 + 1]; // tcp:PORT
     sprintf(local, "tcp:%" PRIu16, local_port);
@@ -167,7 +166,7 @@ adb_forward_remove(const char *serial, uint16_t local_port) {
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-process_t
+sc_pid
 adb_reverse(const char *serial, const char *device_socket_name,
             uint16_t local_port) {
     char local[4 + 5 + 1]; // tcp:PORT
@@ -178,7 +177,7 @@ adb_reverse(const char *serial, const char *device_socket_name,
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-process_t
+sc_pid
 adb_reverse_remove(const char *serial, const char *device_socket_name) {
     char remote[108 + 14 + 1]; // localabstract:NAME
     snprintf(remote, sizeof(remote), "localabstract:%s", device_socket_name);
@@ -186,66 +185,65 @@ adb_reverse_remove(const char *serial, const char *device_socket_name) {
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-process_t
+sc_pid
 adb_push(const char *serial, const char *local, const char *remote) {
 #ifdef __WINDOWS__
     // Windows will parse the string, so the paths must be quoted
     // (see sys/win/command.c)
     local = strquote(local);
     if (!local) {
-        return PROCESS_NONE;
+        return SC_PROCESS_NONE;
     }
     remote = strquote(remote);
     if (!remote) {
         free((void *) local);
-        return PROCESS_NONE;
+        return SC_PROCESS_NONE;
     }
 #endif
 
     const char *const adb_cmd[] = {"push", local, remote};
-    process_t proc = adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
+    sc_pid pid = adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 
 #ifdef __WINDOWS__
     free((void *) remote);
     free((void *) local);
 #endif
 
-    return proc;
+    return pid;
 }
 
-process_t
+sc_pid
 adb_install(const char *serial, const char *local) {
 #ifdef __WINDOWS__
     // Windows will parse the string, so the local name must be quoted
     // (see sys/win/command.c)
     local = strquote(local);
     if (!local) {
-        return PROCESS_NONE;
+        return SC_PROCESS_NONE;
     }
 #endif
 
     const char *const adb_cmd[] = {"install", "-r", local};
-    process_t proc = adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
+    sc_pid pid = adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 
 #ifdef __WINDOWS__
     free((void *) local);
 #endif
 
-    return proc;
+    return pid;
 }
 
 static ssize_t
 adb_execute_for_output(const char *serial, const char *const adb_cmd[],
                        size_t adb_cmd_len, char *buf, size_t buf_len,
                        const char *name) {
-    pipe_t pipe_stdout;
+    sc_pipe pout;
-    process_t proc = adb_execute_redirect(serial, adb_cmd, adb_cmd_len, NULL,
+    sc_pid pid = adb_execute_p(serial, adb_cmd, adb_cmd_len, NULL, &pout, NULL);
-                                          &pipe_stdout, NULL);
 
-    ssize_t r = read_pipe_all(pipe_stdout, buf, buf_len);
+    ssize_t r = sc_pipe_read_all(pout, buf, buf_len);
-    close_pipe(pipe_stdout);
+    sc_pipe_close(pout);
 
-    if (!process_check_success(proc, name, true)) {
+    if (!sc_process_check_success(pid, name, true)) {
         return -1;
     }
 

app/src/adb.h

@@ -8,32 +8,31 @@
 
 #include "util/process.h"
 
-process_t
+sc_pid
 adb_execute(const char *serial, const char *const adb_cmd[], size_t len);
 
-process_t
+sc_pid
-adb_execute_redirect(const char *serial, const char *const adb_cmd[],
+adb_execute_p(const char *serial, const char *const adb_cmd[],
-                     size_t len, pipe_t *pipe_stdin, pipe_t *pipe_stdout,
+              size_t len, sc_pipe *pin, sc_pipe *pout, sc_pipe *perr);
-                     pipe_t *pipe_stderr);
 
-process_t
+sc_pid
 adb_forward(const char *serial, uint16_t local_port,
             const char *device_socket_name);
 
-process_t
+sc_pid
 adb_forward_remove(const char *serial, uint16_t local_port);
 
-process_t
+sc_pid
 adb_reverse(const char *serial, const char *device_socket_name,
             uint16_t local_port);
 
-process_t
+sc_pid
 adb_reverse_remove(const char *serial, const char *device_socket_name);
 
-process_t
+sc_pid
 adb_push(const char *serial, const char *local, const char *remote);
 
-process_t
+sc_pid
 adb_install(const char *serial, const char *local);
 
 // Return the result of "adb get-serialno".

app/src/events.h

@@ -1,4 +1,2 @@
 #define EVENT_NEW_FRAME       SDL_USEREVENT
 #define EVENT_STREAM_STOPPED (SDL_USEREVENT + 1)
-#define EVENT_SERVER_CONNECTION_FAILED (SDL_USEREVENT + 2)
-#define EVENT_SERVER_CONNECTED         (SDL_USEREVENT + 3)

app/src/file_handler.c

@@ -46,7 +46,7 @@ file_handler_init(struct file_handler *file_handler, const char *serial,
     file_handler->initialized = false;
 
     file_handler->stopped = false;
-    file_handler->current_process = PROCESS_NONE;
+    file_handler->current_process = SC_PROCESS_NONE;
 
     file_handler->push_target = push_target ? push_target : DEFAULT_PUSH_TARGET;
 
@@ -65,12 +65,12 @@ file_handler_destroy(struct file_handler *file_handler) {
     }
 }
 
-static process_t
+static sc_pid
 install_apk(const char *serial, const char *file) {
     return adb_install(serial, file);
 }
 
-static process_t
+static sc_pid
 push_file(const char *serial, const char *file, const char *push_target) {
     return adb_push(serial, file, push_target);
 }
@@ -109,7 +109,7 @@ run_file_handler(void *data) {
 
     for (;;) {
         sc_mutex_lock(&file_handler->mutex);
-        file_handler->current_process = PROCESS_NONE;
+        file_handler->current_process = SC_PROCESS_NONE;
         while (!file_handler->stopped && cbuf_is_empty(&file_handler->queue)) {
             sc_cond_wait(&file_handler->event_cond, &file_handler->mutex);
         }
@@ -123,26 +123,26 @@ run_file_handler(void *data) {
         assert(non_empty);
         (void) non_empty;
 
-        process_t process;
+        sc_pid pid;
         if (req.action == ACTION_INSTALL_APK) {
             LOGI("Installing %s...", req.file);
-            process = install_apk(file_handler->serial, req.file);
+            pid = install_apk(file_handler->serial, req.file);
         } else {
             LOGI("Pushing %s...", req.file);
-            process = push_file(file_handler->serial, req.file,
+            pid = push_file(file_handler->serial, req.file,
                             file_handler->push_target);
         }
-        file_handler->current_process = process;
+        file_handler->current_process = pid;
         sc_mutex_unlock(&file_handler->mutex);
 
         if (req.action == ACTION_INSTALL_APK) {
-            if (process_check_success(process, "adb install", false)) {
+            if (sc_process_check_success(pid, "adb install", false)) {
                 LOGI("%s successfully installed", req.file);
             } else {
                 LOGE("Failed to install %s", req.file);
             }
         } else {
-            if (process_check_success(process, "adb push", false)) {
+            if (sc_process_check_success(pid, "adb push", false)) {
                 LOGI("%s successfully pushed to %s", req.file,
                                                      file_handler->push_target);
             } else {
@@ -152,11 +152,11 @@ run_file_handler(void *data) {
         }
 
         sc_mutex_lock(&file_handler->mutex);
-        // Close the process (it is necessary already terminated)
+        // Close the process (it is necessarily already terminated)
         // Execute this call with mutex locked to avoid race conditions with
         // file_handler_stop()
-        process_close(file_handler->current_process);
+        sc_process_close(file_handler->current_process);
-        file_handler->current_process = PROCESS_NONE;
+        file_handler->current_process = SC_PROCESS_NONE;
         sc_mutex_unlock(&file_handler->mutex);
 
         file_handler_request_destroy(&req);
@@ -183,8 +183,8 @@ file_handler_stop(struct file_handler *file_handler) {
     sc_mutex_lock(&file_handler->mutex);
     file_handler->stopped = true;
     sc_cond_signal(&file_handler->event_cond);
-    if (file_handler->current_process != PROCESS_NONE) {
+    if (file_handler->current_process != SC_PROCESS_NONE) {
-        if (!process_terminate(file_handler->current_process)) {
+        if (!sc_process_terminate(file_handler->current_process)) {
             LOGW("Could not terminate push/install process");
         }
     }

app/src/file_handler.h

@@ -29,7 +29,7 @@ struct file_handler {
     sc_cond event_cond;
     bool stopped;
     bool initialized;
-    process_t current_process;
+    sc_pid current_process;
     struct file_handler_request_queue queue;
 };
 

app/src/icon.c

@@ -8,8 +8,8 @@
 
 #include "config.h"
 #include "compat.h"
+#include "util/file.h"
 #include "util/log.h"
-#include "util/process.h"
 #include "util/str_util.h"
 
 #define SCRCPY_PORTABLE_ICON_FILENAME "icon.png"
@@ -46,7 +46,7 @@ get_icon_path(void) {
         return NULL;
     }
 #else
-    char *icon_path = get_local_file_path(SCRCPY_PORTABLE_ICON_FILENAME);
+    char *icon_path = sc_file_get_local_path(SCRCPY_PORTABLE_ICON_FILENAME);
     if (!icon_path) {
         LOGE("Could not get icon path");
         return NULL;

app/src/scrcpy.c

@@ -217,29 +217,6 @@ event_loop(struct scrcpy *s, const struct scrcpy_options *options) {
     return false;
 }
 
-static bool
-await_for_server(void) {
-    SDL_Event event;
-    while (SDL_WaitEvent(&event)) {
-        switch (event.type) {
-            case SDL_QUIT:
-                LOGD("User requested to quit");
-                return false;
-            case EVENT_SERVER_CONNECTION_FAILED:
-                LOGE("Server connection failed");
-                return false;
-            case EVENT_SERVER_CONNECTED:
-                LOGD("Server connected");
-                return true;
-            default:
-                break;
-        }
-    }
-
-    LOGE("SDL_WaitEvent() error: %s", SDL_GetError());
-    return false;
-}
-
 static SDL_LogPriority
 sdl_priority_from_av_level(int level) {
     switch (level) {
@@ -285,31 +262,6 @@ stream_on_eos(struct stream *stream, void *userdata) {
     PUSH_EVENT(EVENT_STREAM_STOPPED);
 }
 
-static void
-server_on_connection_failed(struct server *server, void *userdata) {
-    (void) server;
-    (void) userdata;
-
-    PUSH_EVENT(EVENT_SERVER_CONNECTION_FAILED);
-}
-
-static void
-server_on_connected(struct server *server, void *userdata) {
-    (void) server;
-    (void) userdata;
-
-    PUSH_EVENT(EVENT_SERVER_CONNECTED);
-}
-
-static void
-server_on_disconnected(struct server *server, void *userdata) {
-    (void) server;
-    (void) userdata;
-
-    LOGD("Server disconnected");
-    // Do nothing, will be managed by the "stream stopped" event
-}
-
 bool
 scrcpy(struct scrcpy_options *options) {
     static struct scrcpy scrcpy;
@@ -323,6 +275,10 @@ scrcpy(struct scrcpy_options *options) {
 
     atexit(SDL_Quit);
 
+    if (!server_init(&s->server)) {
+        return false;
+    }
+
     bool ret = false;
 
     bool server_started = false;
@@ -357,17 +313,7 @@ scrcpy(struct scrcpy_options *options) {
         .force_adb_forward = options->force_adb_forward,
         .power_off_on_close = options->power_off_on_close,
     };
-
+    if (!server_start(&s->server, &params)) {
-    static const struct server_callbacks cbs = {
-        .on_connection_failed = server_on_connection_failed,
-        .on_connected = server_on_connected,
-        .on_disconnected = server_on_disconnected,
-    };
-    if (!server_init(&s->server, &params, &cbs, NULL)) {
-        return false;
-    }
-
-    if (!server_start(&s->server)) {
         goto end;
     }
 
@@ -385,15 +331,14 @@ scrcpy(struct scrcpy_options *options) {
 
     sdl_configure(options->display, options->disable_screensaver);
 
-    // Await for server without blocking Ctrl+C handling
+    struct server_info info;
-    if (!await_for_server()) {
+
+    if (!server_connect_to(&s->server, &info)) {
         goto end;
     }
 
-    struct server_info *info = &s->server.info;
-
     if (options->display && options->control) {
-        if (!file_handler_init(&s->file_handler, options->serial,
+        if (!file_handler_init(&s->file_handler, s->server.serial,
                                options->push_target)) {
             goto end;
         }
@@ -415,7 +360,7 @@ scrcpy(struct scrcpy_options *options) {
         if (!recorder_init(&s->recorder,
                            options->record_filename,
                            options->record_format,
-                           info->frame_size)) {
+                           info.frame_size)) {
             goto end;
         }
         rec = &s->recorder;
@@ -461,11 +406,11 @@ scrcpy(struct scrcpy_options *options) {
 
     if (options->display) {
         const char *window_title =
-            options->window_title ? options->window_title : info->device_name;
+            options->window_title ? options->window_title : info.device_name;
 
         struct screen_params screen_params = {
             .window_title = window_title,
-            .frame_size = info->frame_size,
+            .frame_size = info.frame_size,
             .always_on_top = options->always_on_top,
             .window_x = options->window_x,
             .window_y = options->window_y,
@@ -489,7 +434,7 @@ scrcpy(struct scrcpy_options *options) {
 #ifdef HAVE_V4L2
     if (options->v4l2_device) {
         if (!sc_v4l2_sink_init(&s->v4l2_sink, options->v4l2_device,
-                               info->frame_size, options->v4l2_buffer)) {
+                               info.frame_size, options->v4l2_buffer)) {
             goto end;
         }
 

app/src/server.c

@@ -8,6 +8,7 @@
 #include <SDL2/SDL_platform.h>
 
 #include "adb.h"
+#include "util/file.h"
 #include "util/log.h"
 #include "util/net.h"
 #include "util/str_util.h"
@@ -48,7 +49,7 @@ get_server_path(void) {
         return NULL;
     }
 #else
-    char *server_path = get_local_file_path(SERVER_FILENAME);
+    char *server_path = sc_file_get_local_path(SERVER_FILENAME);
     if (!server_path) {
         LOGE("Could not get local file path, "
              "using " SERVER_FILENAME " from current directory");
@@ -61,106 +62,66 @@ get_server_path(void) {
     return server_path;
 }
 
-static void
-server_params_destroy(struct server_params *params) {
-    // The server stores a copy of the params provided by the user
-    free((char *) params->serial);
-    free((char *) params->crop);
-    free((char *) params->codec_options);
-    free((char *) params->encoder_name);
-}
-
-static bool
-server_params_copy(struct server_params *dst, const struct server_params *src) {
-    *dst = *src;
-
-    // The params reference user-allocated memory, so we must copy them to
-    // handle them from another thread
-
-#define COPY(FIELD) \
-    dst->FIELD = NULL; \
-    if (src->FIELD) { \
-        dst->FIELD = strdup(src->FIELD); \
-        if (!dst->FIELD) { \
-            goto error; \
-        } \
-    }
-
-    COPY(serial);
-    COPY(crop);
-    COPY(codec_options);
-    COPY(encoder_name);
-#undef COPY
-
-    return true;
-
-error:
-    server_params_destroy(dst);
-    return false;
-}
-
 static bool
 push_server(const char *serial) {
     char *server_path = get_server_path();
     if (!server_path) {
         return false;
     }
-    if (!is_regular_file(server_path)) {
+    if (!sc_file_is_regular(server_path)) {
         LOGE("'%s' does not exist or is not a regular file\n", server_path);
         free(server_path);
         return false;
     }
-    process_t process = adb_push(serial, server_path, DEVICE_SERVER_PATH);
+    sc_pid pid = adb_push(serial, server_path, DEVICE_SERVER_PATH);
     free(server_path);
-    return process_check_success(process, "adb push", true);
+    return sc_process_check_success(pid, "adb push", true);
 }
 
 static bool
 enable_tunnel_reverse(const char *serial, uint16_t local_port) {
-    process_t process = adb_reverse(serial, SOCKET_NAME, local_port);
+    sc_pid pid = adb_reverse(serial, SOCKET_NAME, local_port);
-    return process_check_success(process, "adb reverse", true);
+    return sc_process_check_success(pid, "adb reverse", true);
 }
 
 static bool
 disable_tunnel_reverse(const char *serial) {
-    process_t process = adb_reverse_remove(serial, SOCKET_NAME);
+    sc_pid pid = adb_reverse_remove(serial, SOCKET_NAME);
-    return process_check_success(process, "adb reverse --remove", true);
+    return sc_process_check_success(pid, "adb reverse --remove", true);
 }
 
 static bool
 enable_tunnel_forward(const char *serial, uint16_t local_port) {
-    process_t process = adb_forward(serial, local_port, SOCKET_NAME);
+    sc_pid pid = adb_forward(serial, local_port, SOCKET_NAME);
-    return process_check_success(process, "adb forward", true);
+    return sc_process_check_success(pid, "adb forward", true);
 }
 
 static bool
 disable_tunnel_forward(const char *serial, uint16_t local_port) {
-    process_t process = adb_forward_remove(serial, local_port);
+    sc_pid pid = adb_forward_remove(serial, local_port);
-    return process_check_success(process, "adb forward --remove", true);
+    return sc_process_check_success(pid, "adb forward --remove", true);
 }
 
 static bool
 disable_tunnel(struct server *server) {
-    const char *serial = server->params.serial;
     if (server->tunnel_forward) {
-        return disable_tunnel_forward(serial, server->local_port);
+        return disable_tunnel_forward(server->serial, server->local_port);
     }
-    return disable_tunnel_reverse(serial);
+    return disable_tunnel_reverse(server->serial);
 }
 
-static bool
+static sc_socket
-listen_on_port(sc_socket socket, uint16_t port) {
+listen_on_port(uint16_t port) {
 #define IPV4_LOCALHOST 0x7F000001
-    return net_listen(socket, IPV4_LOCALHOST, port, 1);
+    return net_listen(IPV4_LOCALHOST, port, 1);
 }
 
 static bool
 enable_tunnel_reverse_any_port(struct server *server,
                                struct sc_port_range port_range) {
-    const char *serial = server->params.serial;
     uint16_t port = port_range.first;
     for (;;) {
-        if (!enable_tunnel_reverse(serial, port)) {
+        if (!enable_tunnel_reverse(server->serial, port)) {
             // the command itself failed, it will fail on any port
             return false;
         }
@@ -171,21 +132,15 @@ enable_tunnel_reverse_any_port(struct server *server,
         // client can listen before starting the server app, so there is no
         // need to try to connect until the server socket is listening on the
         // device.
-        sc_socket server_socket = net_socket();
+        server->server_socket = listen_on_port(port);
-        if (server_socket != SC_INVALID_SOCKET) {
+        if (server->server_socket != SC_INVALID_SOCKET) {
-            bool ok = listen_on_port(server_socket, port);
-            if (ok) {
             // success
-                server->server_socket = server_socket;
             server->local_port = port;
             return true;
         }
 
-            net_close(server_socket);
-        }
-
         // failure, disable tunnel and try another port
-        if (!disable_tunnel_reverse(serial)) {
+        if (!disable_tunnel_reverse(server->serial)) {
             LOGW("Could not remove reverse tunnel on port %" PRIu16, port);
         }
 
@@ -211,11 +166,9 @@ static bool
 enable_tunnel_forward_any_port(struct server *server,
                                struct sc_port_range port_range) {
     server->tunnel_forward = true;
-
-    const char *serial = server->params.serial;
     uint16_t port = port_range.first;
     for (;;) {
-        if (enable_tunnel_forward(serial, port)) {
+        if (enable_tunnel_forward(server->serial, port)) {
             // success
             server->local_port = port;
             return true;
@@ -275,10 +228,8 @@ log_level_to_server_string(enum sc_log_level level) {
     }
 }
 
-static process_t
+static sc_pid
 execute_server(struct server *server, const struct server_params *params) {
-    const char *serial = server->params.serial;
-
     char max_size_string[6];
     char bit_rate_string[11];
     char max_fps_string[6];
@@ -336,22 +287,16 @@ execute_server(struct server *server, const struct server_params *params) {
     //     Port: 5005
     // Then click on "Debug"
 #endif
-    return adb_execute(serial, cmd, ARRAY_LEN(cmd));
+    return adb_execute(server->serial, cmd, ARRAY_LEN(cmd));
 }
 
 static sc_socket
 connect_and_read_byte(uint16_t port) {
-    sc_socket socket = net_socket();
+    sc_socket socket = net_connect(IPV4_LOCALHOST, port);
     if (socket == SC_INVALID_SOCKET) {
         return SC_INVALID_SOCKET;
     }
 
-    bool ok = net_connect(socket, IPV4_LOCALHOST, port);
-    if (!ok) {
-        net_close(socket);
-        return SC_INVALID_SOCKET;
-    }
-
     char byte;
     // the connection may succeed even if the server behind the "adb tunnel"
     // is not listening, so read one byte to detect a working connection
@@ -364,8 +309,7 @@ connect_and_read_byte(uint16_t port) {
 }
 
 static sc_socket
-connect_to_server(struct server *server, uint32_t attempts, sc_tick delay) {
+connect_to_server(uint16_t port, uint32_t attempts, uint32_t delay) {
-    uint16_t port = server->local_port;
     do {
         LOGD("Remaining connection attempts: %d", (int) attempts);
         sc_socket socket = connect_and_read_byte(port);
@@ -374,56 +318,29 @@ connect_to_server(struct server *server, uint32_t attempts, sc_tick delay) {
             return socket;
         }
         if (attempts) {
-            sc_mutex_lock(&server->mutex);
+            SDL_Delay(delay);
-            // Ignore timedwait return (spurious wake ups are harmless)
-            sc_cond_timedwait(&server->stopped_cond, &server->mutex,
-                              sc_tick_now() + delay);
-            bool stopped = server->stopped;
-            sc_mutex_unlock(&server->mutex);
-            if (stopped) {
-                LOGI("Connection attempt stopped");
-                break;
-            }
         }
     } while (--attempts > 0);
     return SC_INVALID_SOCKET;
 }
 
 bool
-server_init(struct server *server, const struct server_params *params,
+server_init(struct server *server) {
-            const struct server_callbacks *cbs, void *cbs_userdata) {
+    server->serial = NULL;
-    bool ok = server_params_copy(&server->params, params);
+    server->process = SC_PROCESS_NONE;
-    if (!ok) {
-        LOGE("Could not copy server params");
-        return false;
-    }
 
-    server->process = PROCESS_NONE;
+    bool ok = sc_mutex_init(&server->mutex);
-
-    ok = sc_mutex_init(&server->mutex);
     if (!ok) {
-        server_params_destroy(&server->params);
         return false;
     }
 
     ok = sc_cond_init(&server->process_terminated_cond);
     if (!ok) {
         sc_mutex_destroy(&server->mutex);
-        server_params_destroy(&server->params);
-        return false;
-    }
-
-    ok = sc_cond_init(&server->stopped_cond);
-    if (!ok) {
-        sc_cond_destroy(&server->process_terminated_cond);
-        sc_mutex_destroy(&server->mutex);
-        server_params_destroy(&server->params);
         return false;
     }
 
     server->process_terminated = false;
-    server->stopped = false;
-    server->connected = false;
 
     server->server_socket = SC_INVALID_SOCKET;
     server->video_socket = SC_INVALID_SOCKET;
@@ -434,69 +351,13 @@ server_init(struct server *server, const struct server_params *params,
     server->tunnel_enabled = false;
     server->tunnel_forward = false;
 
-    assert(cbs);
-    assert(cbs->on_connection_failed);
-    assert(cbs->on_connected);
-    assert(cbs->on_disconnected);
-
-    server->cbs = cbs;
-    server->cbs_userdata = cbs_userdata;
-
     return true;
 }
 
 static int
-run_server_connect(void *data) {
+run_wait_server(void *data) {
     struct server *server = data;
-
+    sc_process_wait(server->process, false); // ignore exit code
-    if (!server_connect_to(server, &server->info)) {
-        server->cbs->on_connection_failed(server, server->cbs_userdata);
-        goto end;
-    }
-
-    server->connected = true;
-    server->cbs->on_connected(server, server->cbs_userdata);
-
-end:
-    return 0;
-}
-
-static int
-run_server(void *data) {
-    struct server *server = data;
-
-    const struct server_params *params = &server->params;
-
-    if (!push_server(params->serial)) {
-        server->cbs->on_connection_failed(server, server->cbs_userdata);
-        goto end;
-    }
-
-    if (!enable_tunnel_any_port(server, params->port_range,
-                                params->force_adb_forward)) {
-        server->cbs->on_connection_failed(server, server->cbs_userdata);
-        goto end;
-    }
-
-    server->process = execute_server(server, params);
-    if (server->process == PROCESS_NONE) {
-        server->cbs->on_connection_failed(server, server->cbs_userdata);
-        goto end;
-    }
-
-    sc_thread connect_thread;
-    bool ok = sc_thread_create(&connect_thread, run_server_connect,
-                               "server-connect", server);
-    if (!ok) {
-        LOGW("Could not create thread, killing the server...");
-        process_terminate(server->process);
-        server->cbs->on_connection_failed(server, server->cbs_userdata);
-        process_wait(server->process, false); // ignore exit code
-        goto end;
-    }
-
-    process_wait(server->process, false); // ignore exit code
-    LOGD("Server terminated");
 
     sc_mutex_lock(&server->mutex);
     server->process_terminated = true;
@@ -510,22 +371,59 @@ run_server(void *data) {
         net_interrupt(server->server_socket);
     }
 
-    sc_thread_join(&connect_thread, NULL);
+    LOGD("Server terminated");
-
-    // Written by connect_thread, sc_thread_join() provides the necessary
-    // memory barrier
-    if (server->connected) {
-        server->cbs->on_disconnected(server, server->cbs_userdata);
-    }
-    // Otherwise, ->on_connection_failed() is already called
-
-end:
     return 0;
 }
 
 bool
-server_start(struct server *server) {
+server_start(struct server *server, const struct server_params *params) {
-    return sc_thread_create(&server->thread, run_server, "server", server);
+    if (params->serial) {
+        server->serial = strdup(params->serial);
+        if (!server->serial) {
+            return false;
+        }
+    }
+
+    if (!push_server(params->serial)) {
+        /* server->serial will be freed on server_destroy() */
+        return false;
+    }
+
+    if (!enable_tunnel_any_port(server, params->port_range,
+                                params->force_adb_forward)) {
+        return false;
+    }
+
+    // server will connect to our server socket
+    server->process = execute_server(server, params);
+    if (server->process == SC_PROCESS_NONE) {
+        goto error;
+    }
+
+    // If the server process dies before connecting to the server socket, then
+    // the client will be stuck forever on accept(). To avoid the problem, we
+    // must be able to wake up the accept() call when the server dies. To keep
+    // things simple and multiplatform, just spawn a new thread waiting for the
+    // server process and calling shutdown()/close() on the server socket if
+    // necessary to wake up any accept() blocking call.
+    bool ok = sc_thread_create(&server->wait_server_thread, run_wait_server,
+                               "wait-server", server);
+    if (!ok) {
+        sc_process_terminate(server->process);
+        sc_process_wait(server->process, true); // ignore exit code
+        goto error;
+    }
+
+    server->tunnel_enabled = true;
+
+    return true;
+
+error:
+    // The server socket (if any) will be closed on server_destroy()
+
+    disable_tunnel(server);
+
+    return false;
 }
 
 static bool
@@ -569,23 +467,19 @@ server_connect_to(struct server *server, struct server_info *info) {
         server->server_socket = SC_INVALID_SOCKET;
     } else {
         uint32_t attempts = 100;
-        sc_tick delay = SC_TICK_FROM_MS(100);
+        uint32_t delay = 100; // ms
-        server->video_socket = connect_to_server(server, attempts, delay);
+        server->video_socket =
+            connect_to_server(server->local_port, attempts, delay);
         if (server->video_socket == SC_INVALID_SOCKET) {
             return false;
         }
 
         // we know that the device is listening, we don't need several attempts
-        server->control_socket = net_socket();
+        server->control_socket =
+            net_connect(IPV4_LOCALHOST, server->local_port);
         if (server->control_socket == SC_INVALID_SOCKET) {
             return false;
         }
-        bool ok = net_connect(server->control_socket, IPV4_LOCALHOST,
-                              server->local_port);
-        if (!ok) {
-            net_close(server->control_socket);
-            return false;
-        }
     }
 
     // we don't need the adb tunnel anymore
@@ -598,11 +492,6 @@ server_connect_to(struct server *server, struct server_info *info) {
 
 void
 server_stop(struct server *server) {
-    sc_mutex_lock(&server->mutex);
-    server->stopped = true;
-    sc_cond_signal(&server->stopped_cond);
-    sc_mutex_unlock(&server->mutex);
-
     if (server->server_socket != SC_INVALID_SOCKET) {
         if (!net_interrupt(server->server_socket)) {
             LOGW("Could not interrupt server socket");
@@ -619,7 +508,7 @@ server_stop(struct server *server) {
         }
     }
 
-    assert(server->process != PROCESS_NONE);
+    assert(server->process != SC_PROCESS_NONE);
 
     if (server->tunnel_enabled) {
         // ignore failure
@@ -644,11 +533,11 @@ server_stop(struct server *server) {
         // The process is terminated, but not reaped (closed) yet, so its PID
         // is still valid.
         LOGW("Killing the server...");
-        process_terminate(server->process);
+        sc_process_terminate(server->process);
     }
 
-    sc_thread_join(&server->thread, NULL);
+    sc_thread_join(&server->wait_server_thread, NULL);
-    process_close(server->process);
+    sc_process_close(server->process);
 }
 
 void
@@ -668,9 +557,7 @@ server_destroy(struct server *server) {
             LOGW("Could not close control socket");
         }
     }
-
+    free(server->serial);
-    server_params_destroy(&server->params);
-    sc_cond_destroy(&server->stopped_cond);
     sc_cond_destroy(&server->process_terminated_cond);
     sc_mutex_destroy(&server->mutex);
 }

app/src/server.h

@@ -20,6 +20,23 @@ struct server_info {
     struct sc_size frame_size;
 };
 
+struct server {
+    char *serial;
+    sc_pid process;
+    sc_thread wait_server_thread;
+
+    sc_mutex mutex;
+    sc_cond process_terminated_cond;
+    bool process_terminated;
+
+    sc_socket server_socket; // only used if !tunnel_forward
+    sc_socket video_socket;
+    sc_socket control_socket;
+    uint16_t local_port; // selected from port_range
+    bool tunnel_enabled;
+    bool tunnel_forward; // use "adb forward" instead of "adb reverse"
+};
+
 struct server_params {
     const char *serial;
     enum sc_log_level log_level;
@@ -39,52 +56,15 @@ struct server_params {
     bool power_off_on_close;
 };
 
-struct server {
+// init default values
-    // The internal allocated strings are copies owned by the server
-    struct server_params params;
-
-    process_t process;
-    sc_thread thread;
-
-    sc_mutex mutex;
-
-    sc_cond process_terminated_cond;
-    bool process_terminated;
-
-    sc_cond stopped_cond;
-    bool stopped;
-
-    bool connected; // written by connect_thread
-    struct server_info info; // initialized once connected
-
-    sc_socket server_socket; // only used if !tunnel_forward
-    sc_socket video_socket;
-    sc_socket control_socket;
-    uint16_t local_port; // selected from port_range
-    bool tunnel_enabled;
-    bool tunnel_forward; // use "adb forward" instead of "adb reverse"
-
-    const struct server_callbacks *cbs;
-    void *cbs_userdata;
-};
-
-struct server_callbacks {
-    void (*on_connection_failed)(struct server *server, void *userdata);
-    void (*on_connected)(struct server *server, void *userdata);
-    void (*on_disconnected)(struct server *server, void *userdata);
-};
-
-// init the server with the given params
 bool
-server_init(struct server *server, const struct server_params *params,
+server_init(struct server *server);
-            const struct server_callbacks *cbs, void *cbs_userdata);
 
 // push, enable tunnel et start the server
 bool
-server_start(struct server *server);
+server_start(struct server *server, const struct server_params *params);
 
 // block until the communication with the server is established
-// device_name must point to a buffer of at least DEVICE_NAME_FIELD_LENGTH bytes
 bool
 server_connect_to(struct server *server, struct server_info *info);
 

app/src/sys/unix/file.c

@@ -0,0 +1,75 @@
+#include "util/file.h"
+
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+bool
+sc_file_executable_exists(const char *file) {
+    char *path = getenv("PATH");
+    if (!path)
+        return false;
+    path = strdup(path);
+    if (!path)
+        return false;
+
+    bool ret = false;
+    size_t file_len = strlen(file);
+    char *saveptr;
+    for (char *dir = strtok_r(path, ":", &saveptr); dir;
+            dir = strtok_r(NULL, ":", &saveptr)) {
+        size_t dir_len = strlen(dir);
+        char *fullpath = malloc(dir_len + file_len + 2);
+        if (!fullpath)
+            continue;
+        memcpy(fullpath, dir, dir_len);
+        fullpath[dir_len] = '/';
+        memcpy(fullpath + dir_len + 1, file, file_len + 1);
+
+        struct stat sb;
+        bool fullpath_executable = stat(fullpath, &sb) == 0 &&
+            sb.st_mode & S_IXUSR;
+        free(fullpath);
+        if (fullpath_executable) {
+            ret = true;
+            break;
+        }
+    }
+
+    free(path);
+    return ret;
+}
+
+char *
+sc_file_get_executable_path(void) {
+// <https://stackoverflow.com/a/1024937/1987178>
+#ifdef __linux__
+    char buf[PATH_MAX + 1]; // +1 for the null byte
+    ssize_t len = readlink("/proc/self/exe", buf, PATH_MAX);
+    if (len == -1) {
+        perror("readlink");
+        return NULL;
+    }
+    buf[len] = '\0';
+    return strdup(buf);
+#else
+    // in practice, we only need this feature for portable builds, only used on
+    // Windows, so we don't care implementing it for every platform
+    // (it's useful to have a working version on Linux for debugging though)
+    return NULL;
+#endif
+}
+
+bool
+sc_file_is_regular(const char *path) {
+    struct stat path_stat;
+
+    if (stat(path, &path_stat)) {
+        perror("stat");
+        return false;
+    }
+    return S_ISREG(path_stat.st_mode);
+}
+

app/src/sys/unix/process.c

@@ -3,56 +3,16 @@
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <limits.h>
 #include <signal.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #include "util/log.h"
 
-bool
+enum sc_process_result
-search_executable(const char *file) {
+sc_process_execute_p(const char *const argv[], sc_pid *pid,
-    char *path = getenv("PATH");
+                     int *pin, int *pout, int *perr) {
-    if (!path)
-        return false;
-    path = strdup(path);
-    if (!path)
-        return false;
-
-    bool ret = false;
-    size_t file_len = strlen(file);
-    char *saveptr;
-    for (char *dir = strtok_r(path, ":", &saveptr); dir;
-            dir = strtok_r(NULL, ":", &saveptr)) {
-        size_t dir_len = strlen(dir);
-        char *fullpath = malloc(dir_len + file_len + 2);
-        if (!fullpath)
-            continue;
-        memcpy(fullpath, dir, dir_len);
-        fullpath[dir_len] = '/';
-        memcpy(fullpath + dir_len + 1, file, file_len + 1);
-
-        struct stat sb;
-        bool fullpath_executable = stat(fullpath, &sb) == 0 &&
-            sb.st_mode & S_IXUSR;
-        free(fullpath);
-        if (fullpath_executable) {
-            ret = true;
-            break;
-        }
-    }
-
-    free(path);
-    return ret;
-}
-
-enum process_result
-process_execute_redirect(const char *const argv[], pid_t *pid, int *pipe_stdin,
-                     int *pipe_stdout, int *pipe_stderr) {
     int in[2];
     int out[2];
     int err[2];
@@ -60,44 +20,44 @@ process_execute_redirect(const char *const argv[], pid_t *pid, int *pipe_stdin,
 
     if (pipe(internal) == -1) {
         perror("pipe");
-        return PROCESS_ERROR_GENERIC;
+        return SC_PROCESS_ERROR_GENERIC;
     }
-    if (pipe_stdin) {
+    if (pin) {
         if (pipe(in) == -1) {
             perror("pipe");
             close(internal[0]);
             close(internal[1]);
-            return PROCESS_ERROR_GENERIC;
+            return SC_PROCESS_ERROR_GENERIC;
         }
     }
-    if (pipe_stdout) {
+    if (pout) {
         if (pipe(out) == -1) {
             perror("pipe");
             // clean up
-            if (pipe_stdin) {
+            if (pin) {
                 close(in[0]);
                 close(in[1]);
             }
             close(internal[0]);
             close(internal[1]);
-            return PROCESS_ERROR_GENERIC;
+            return SC_PROCESS_ERROR_GENERIC;
         }
     }
-    if (pipe_stderr) {
+    if (perr) {
         if (pipe(err) == -1) {
             perror("pipe");
             // clean up
-            if (pipe_stdout) {
+            if (pout) {
                 close(out[0]);
                 close(out[1]);
             }
-            if (pipe_stdin) {
+            if (pin) {
                 close(in[0]);
                 close(in[1]);
             }
             close(internal[0]);
             close(internal[1]);
-            return PROCESS_ERROR_GENERIC;
+            return SC_PROCESS_ERROR_GENERIC;
         }
     }
 
@@ -105,39 +65,39 @@ process_execute_redirect(const char *const argv[], pid_t *pid, int *pipe_stdin,
     if (*pid == -1) {
         perror("fork");
         // clean up
-        if (pipe_stderr) {
+        if (perr) {
             close(err[0]);
             close(err[1]);
         }
-        if (pipe_stdout) {
+        if (pout) {
             close(out[0]);
             close(out[1]);
         }
-        if (pipe_stdin) {
+        if (pin) {
             close(in[0]);
             close(in[1]);
         }
         close(internal[0]);
         close(internal[1]);
-        return PROCESS_ERROR_GENERIC;
+        return SC_PROCESS_ERROR_GENERIC;
     }
 
     if (*pid == 0) {
-        if (pipe_stdin) {
+        if (pin) {
             if (in[0] != STDIN_FILENO) {
                 dup2(in[0], STDIN_FILENO);
                 close(in[0]);
             }
             close(in[1]);
         }
-        if (pipe_stdout) {
+        if (pout) {
             if (out[1] != STDOUT_FILENO) {
                 dup2(out[1], STDOUT_FILENO);
                 close(out[1]);
             }
             close(out[0]);
         }
-        if (pipe_stderr) {
+        if (perr) {
             if (err[1] != STDERR_FILENO) {
                 dup2(err[1], STDERR_FILENO);
                 close(err[1]);
@@ -145,15 +105,15 @@ process_execute_redirect(const char *const argv[], pid_t *pid, int *pipe_stdin,
             close(err[0]);
         }
         close(internal[0]);
-        enum process_result err;
+        enum sc_process_result err;
         if (fcntl(internal[1], F_SETFD, FD_CLOEXEC) == 0) {
             execvp(argv[0], (char *const *) argv);
             perror("exec");
-            err = errno == ENOENT ? PROCESS_ERROR_MISSING_BINARY
+            err = errno == ENOENT ? SC_PROCESS_ERROR_MISSING_BINARY
-                                  : PROCESS_ERROR_GENERIC;
+                                  : SC_PROCESS_ERROR_GENERIC;
         } else {
             perror("fcntl");
-            err = PROCESS_ERROR_GENERIC;
+            err = SC_PROCESS_ERROR_GENERIC;
         }
         // send err to the parent
         if (write(internal[1], &err, sizeof(err)) == -1) {
@@ -168,38 +128,33 @@ process_execute_redirect(const char *const argv[], pid_t *pid, int *pipe_stdin,
 
     close(internal[1]);
 
-    enum process_result res = PROCESS_SUCCESS;
+    enum sc_process_result res = SC_PROCESS_SUCCESS;
     // wait for EOF or receive err from child
     if (read(internal[0], &res, sizeof(res)) == -1) {
         perror("read");
-        res = PROCESS_ERROR_GENERIC;
+        res = SC_PROCESS_ERROR_GENERIC;
     }
 
     close(internal[0]);
 
-    if (pipe_stdin) {
+    if (pin) {
         close(in[0]);
-        *pipe_stdin = in[1];
+        *pin = in[1];
     }
-    if (pipe_stdout) {
+    if (pout) {
-        *pipe_stdout = out[0];
+        *pout = out[0];
         close(out[1]);
     }
-    if (pipe_stderr) {
+    if (perr) {
-        *pipe_stderr = err[0];
+        *perr = err[0];
         close(err[1]);
     }
 
     return res;
 }
 
-enum process_result
-process_execute(const char *const argv[], pid_t *pid) {
-    return process_execute_redirect(argv, pid, NULL, NULL, NULL);
-}
-
 bool
-process_terminate(pid_t pid) {
+sc_process_terminate(pid_t pid) {
     if (pid <= 0) {
         LOGC("Requested to kill %d, this is an error. Please report the bug.\n",
              (int) pid);
@@ -208,8 +163,8 @@ process_terminate(pid_t pid) {
     return kill(pid, SIGKILL) != -1;
 }
 
-exit_code_t
+sc_exit_code
-process_wait(pid_t pid, bool close) {
+sc_process_wait(pid_t pid, bool close) {
     int code;
     int options = WEXITED;
     if (!close) {
@@ -220,7 +175,7 @@ process_wait(pid_t pid, bool close) {
     int r = waitid(P_PID, pid, &info, options);
     if (r == -1 || info.si_code != CLD_EXITED) {
         // could not wait, or exited unexpectedly, probably by a signal
-        code = NO_EXIT_CODE;
+        code = SC_EXIT_CODE_NONE;
     } else {
         code = info.si_status;
     }
@@ -228,48 +183,17 @@ process_wait(pid_t pid, bool close) {
 }
 
 void
-process_close(pid_t pid) {
+sc_process_close(pid_t pid) {
-    process_wait(pid, true); // ignore exit code
+    sc_process_wait(pid, true); // ignore exit code
-}
-
-char *
-get_executable_path(void) {
-// <https://stackoverflow.com/a/1024937/1987178>
-#ifdef __linux__
-    char buf[PATH_MAX + 1]; // +1 for the null byte
-    ssize_t len = readlink("/proc/self/exe", buf, PATH_MAX);
-    if (len == -1) {
-        perror("readlink");
-        return NULL;
-    }
-    buf[len] = '\0';
-    return strdup(buf);
-#else
-    // in practice, we only need this feature for portable builds, only used on
-    // Windows, so we don't care implementing it for every platform
-    // (it's useful to have a working version on Linux for debugging though)
-    return NULL;
-#endif
-}
-
-bool
-is_regular_file(const char *path) {
-    struct stat path_stat;
-
-    if (stat(path, &path_stat)) {
-        perror("stat");
-        return false;
-    }
-    return S_ISREG(path_stat.st_mode);
 }
 
 ssize_t
-read_pipe(int pipe, char *data, size_t len) {
+sc_pipe_read(int pipe, char *data, size_t len) {
     return read(pipe, data, len);
 }
 
 void
-close_pipe(int pipe) {
+sc_pipe_close(int pipe) {
     if (close(pipe)) {
         perror("close pipe");
     }

app/src/sys/win/file.c

@@ -0,0 +1,43 @@
+#include "util/file.h"
+
+#include <windows.h>
+
+#include <sys/stat.h>
+
+#include "util/log.h"
+#include "util/str_util.h"
+
+char *
+sc_file_get_executable_path(void) {
+    HMODULE hModule = GetModuleHandleW(NULL);
+    if (!hModule) {
+        return NULL;
+    }
+    WCHAR buf[MAX_PATH + 1]; // +1 for the null byte
+    int len = GetModuleFileNameW(hModule, buf, MAX_PATH);
+    if (!len) {
+        return NULL;
+    }
+    buf[len] = '\0';
+    return utf8_from_wide_char(buf);
+}
+
+bool
+sc_file_is_regular(const char *path) {
+    wchar_t *wide_path = utf8_to_wide_char(path);
+    if (!wide_path) {
+        LOGC("Could not allocate wide char string");
+        return false;
+    }
+
+    struct _stat path_stat;
+    int r = _wstat(wide_path, &path_stat);
+    free(wide_path);
+
+    if (r) {
+        perror("stat");
+        return false;
+    }
+    return S_ISREG(path_stat.st_mode);
+}
+

app/src/sys/win/process.c

@@ -1,7 +1,6 @@
 #include "util/process.h"
 
 #include <assert.h>
-#include <sys/stat.h>
 
 #include "util/log.h"
 #include "util/str_util.h"
@@ -16,17 +15,16 @@ build_cmd(char *cmd, size_t len, const char *const argv[]) {
     // (don't handle escaping nor quotes)
     size_t ret = xstrjoin(cmd, argv, ' ', len);
     if (ret >= len) {
-        LOGE("Command too long (%" PRIsizet " chars)", len - 1);
+        LOGE("Command too long (%" SC_PRIsizet " chars)", len - 1);
         return false;
     }
     return true;
 }
 
-enum process_result
+enum sc_process_result
-process_execute_redirect(const char *const argv[], HANDLE *handle,
+sc_process_execute_p(const char *const argv[], HANDLE *handle,
-                         HANDLE *pipe_stdin, HANDLE *pipe_stdout,
+                     HANDLE *pin, HANDLE *pout, HANDLE *perr) {
-                         HANDLE *pipe_stderr) {
+    enum sc_process_result ret = SC_PROCESS_ERROR_GENERIC;
-    enum process_result ret = PROCESS_ERROR_GENERIC;
 
     SECURITY_ATTRIBUTES sa;
     sa.nLength = sizeof(SECURITY_ATTRIBUTES);
@@ -36,32 +34,32 @@ process_execute_redirect(const char *const argv[], HANDLE *handle,
     HANDLE stdin_read_handle;
     HANDLE stdout_write_handle;
     HANDLE stderr_write_handle;
-    if (pipe_stdin) {
+    if (pin) {
-        if (!CreatePipe(&stdin_read_handle, pipe_stdin, &sa, 0)) {
+        if (!CreatePipe(&stdin_read_handle, pin, &sa, 0)) {
             perror("pipe");
-            return PROCESS_ERROR_GENERIC;
+            return SC_PROCESS_ERROR_GENERIC;
         }
-        if (!SetHandleInformation(*pipe_stdin, HANDLE_FLAG_INHERIT, 0)) {
+        if (!SetHandleInformation(*pin, HANDLE_FLAG_INHERIT, 0)) {
             LOGE("SetHandleInformation stdin failed");
             goto error_close_stdin;
         }
     }
-    if (pipe_stdout) {
+    if (pout) {
-        if (!CreatePipe(pipe_stdout, &stdout_write_handle, &sa, 0)) {
+        if (!CreatePipe(pout, &stdout_write_handle, &sa, 0)) {
             perror("pipe");
             goto error_close_stdin;
         }
-        if (!SetHandleInformation(*pipe_stdout, HANDLE_FLAG_INHERIT, 0)) {
+        if (!SetHandleInformation(*pout, HANDLE_FLAG_INHERIT, 0)) {
             LOGE("SetHandleInformation stdout failed");
             goto error_close_stdout;
         }
     }
-    if (pipe_stderr) {
+    if (perr) {
-        if (!CreatePipe(pipe_stderr, &stderr_write_handle, &sa, 0)) {
+        if (!CreatePipe(perr, &stderr_write_handle, &sa, 0)) {
             perror("pipe");
             goto error_close_stdout;
         }
-        if (!SetHandleInformation(*pipe_stderr, HANDLE_FLAG_INHERIT, 0)) {
+        if (!SetHandleInformation(*perr, HANDLE_FLAG_INHERIT, 0)) {
             LOGE("SetHandleInformation stderr failed");
             goto error_close_stderr;
         }
@@ -71,15 +69,15 @@ process_execute_redirect(const char *const argv[], HANDLE *handle,
     PROCESS_INFORMATION pi;
     memset(&si, 0, sizeof(si));
     si.cb = sizeof(si);
-    if (pipe_stdin || pipe_stdout || pipe_stderr) {
+    if (pin || pout || perr) {
         si.dwFlags = STARTF_USESTDHANDLES;
-        if (pipe_stdin) {
+        if (pin) {
             si.hStdInput = stdin_read_handle;
         }
-        if (pipe_stdout) {
+        if (pout) {
             si.hStdOutput = stdout_write_handle;
         }
-        if (pipe_stderr) {
+        if (perr) {
             si.hStdError = stderr_write_handle;
         }
     }
@@ -103,63 +101,58 @@ process_execute_redirect(const char *const argv[], HANDLE *handle,
         *handle = NULL;
 
         if (GetLastError() == ERROR_FILE_NOT_FOUND) {
-            ret = PROCESS_ERROR_MISSING_BINARY;
+            ret = SC_PROCESS_ERROR_MISSING_BINARY;
         }
         goto error_close_stderr;
     }
 
     // These handles are used by the child process, close them for this process
-    if (pipe_stdin) {
+    if (pin) {
         CloseHandle(stdin_read_handle);
     }
-    if (pipe_stdout) {
+    if (pout) {
         CloseHandle(stdout_write_handle);
     }
-    if (pipe_stderr) {
+    if (perr) {
         CloseHandle(stderr_write_handle);
     }
 
     free(wide);
     *handle = pi.hProcess;
 
-    return PROCESS_SUCCESS;
+    return SC_PROCESS_SUCCESS;
 
 error_close_stderr:
-    if (pipe_stderr) {
+    if (perr) {
-        CloseHandle(*pipe_stderr);
+        CloseHandle(*perr);
         CloseHandle(stderr_write_handle);
     }
 error_close_stdout:
-    if (pipe_stdout) {
+    if (pout) {
-        CloseHandle(*pipe_stdout);
+        CloseHandle(*pout);
         CloseHandle(stdout_write_handle);
     }
 error_close_stdin:
-    if (pipe_stdin) {
+    if (pin) {
-        CloseHandle(*pipe_stdin);
+        CloseHandle(*pin);
         CloseHandle(stdin_read_handle);
     }
 
     return ret;
 }
 
-enum process_result
-process_execute(const char *const argv[], HANDLE *handle) {
-    return process_execute_redirect(argv, handle, NULL, NULL, NULL);
-}
-
 bool
-process_terminate(HANDLE handle) {
+sc_process_terminate(HANDLE handle) {
     return TerminateProcess(handle, 1);
 }
 
-exit_code_t
+sc_exit_code
-process_wait(HANDLE handle, bool close) {
+sc_process_wait(HANDLE handle, bool close) {
     DWORD code;
     if (WaitForSingleObject(handle, INFINITE) != WAIT_OBJECT_0
             || !GetExitCodeProcess(handle, &code)) {
         // could not wait or retrieve the exit code
-        code = NO_EXIT_CODE; // max value, it's unsigned
+        code = SC_EXIT_CODE_NONE;
     }
     if (close) {
         CloseHandle(handle);
@@ -168,48 +161,14 @@ process_wait(HANDLE handle, bool close) {
 }
 
 void
-process_close(HANDLE handle) {
+sc_process_close(HANDLE handle) {
     bool closed = CloseHandle(handle);
     assert(closed);
     (void) closed;
 }
 
-char *
-get_executable_path(void) {
-    HMODULE hModule = GetModuleHandleW(NULL);
-    if (!hModule) {
-        return NULL;
-    }
-    WCHAR buf[MAX_PATH + 1]; // +1 for the null byte
-    int len = GetModuleFileNameW(hModule, buf, MAX_PATH);
-    if (!len) {
-        return NULL;
-    }
-    buf[len] = '\0';
-    return utf8_from_wide_char(buf);
-}
-
-bool
-is_regular_file(const char *path) {
-    wchar_t *wide_path = utf8_to_wide_char(path);
-    if (!wide_path) {
-        LOGC("Could not allocate wide char string");
-        return false;
-    }
-
-    struct _stat path_stat;
-    int r = _wstat(wide_path, &path_stat);
-    free(wide_path);
-
-    if (r) {
-        perror("stat");
-        return false;
-    }
-    return S_ISREG(path_stat.st_mode);
-}
-
 ssize_t
-read_pipe(HANDLE pipe, char *data, size_t len) {
+sc_read_pipe(HANDLE pipe, char *data, size_t len) {
     DWORD r;
     if (!ReadFile(pipe, data, len, &r, NULL)) {
         return -1;
@@ -218,7 +177,7 @@ read_pipe(HANDLE pipe, char *data, size_t len) {
 }
 
 void
-close_pipe(HANDLE pipe) {
+sc_close_pipe(HANDLE pipe) {
     if (!CloseHandle(pipe)) {
         LOGW("Cannot close pipe");
     }

app/src/util/file.c

@@ -0,0 +1,48 @@
+#include "file.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "util/log.h"
+
+char *
+sc_file_get_local_path(const char *name) {
+    char *executable_path = sc_file_get_executable_path();
+    if (!executable_path) {
+        return NULL;
+    }
+
+    // dirname() does not work correctly everywhere, so get the parent
+    // directory manually.
+    // See <https://github.com/Genymobile/scrcpy/issues/2619>
+    char *p = strrchr(executable_path, SC_PATH_SEPARATOR);
+    if (!p) {
+        LOGE("Unexpected executable path: \"%s\" (it should contain a '%c')",
+             executable_path, SC_PATH_SEPARATOR);
+        free(executable_path);
+        return NULL;
+    }
+
+    *p = '\0'; // modify executable_path in place
+    char *dir = executable_path;
+    size_t dirlen = strlen(dir);
+    size_t namelen = strlen(name);
+
+    size_t len = dirlen + namelen + 2; // +2: '/' and '\0'
+    char *file_path = malloc(len);
+    if (!file_path) {
+        LOGE("Could not alloc path");
+        free(executable_path);
+        return NULL;
+    }
+
+    memcpy(file_path, dir, dirlen);
+    file_path[dirlen] = SC_PATH_SEPARATOR;
+    // namelen + 1 to copy the final '\0'
+    memcpy(&file_path[dirlen + 1], name, namelen + 1);
+
+    free(executable_path);
+
+    return file_path;
+}
+

app/src/util/file.h

@@ -0,0 +1,49 @@
+#ifndef SC_FILE_H
+#define SC_FILE_H
+
+#include "common.h"
+
+#include <stdbool.h>
+
+#ifdef _WIN32
+# define SC_PATH_SEPARATOR '\\'
+#else
+# define SC_PATH_SEPARATOR '/'
+#endif
+
+#ifndef _WIN32
+/**
+ * Indicate if an executable exists using $PATH
+ *
+ * In practice, it is only used to know if a package manager is available on
+ * the system. It is only implemented on Linux.
+ */
+bool
+sc_file_executable_exists(const char *file);
+#endif
+
+/**
+ * Return the absolute path of the executable (the scrcpy binary)
+ *
+ * The result must be freed by the caller using free(). It may return NULL on
+ * error.
+ */
+char *
+sc_file_get_executable_path(void);
+
+/**
+ * Return the absolute path of a file in the same directory as the executable
+ *
+ * The result must be freed by the caller using free(). It may return NULL on
+ * error.
+ */
+char *
+sc_file_get_local_path(const char *name);
+
+/**
+ * Indicate if the file exists and is not a directory
+ */
+bool
+sc_file_is_regular(const char *path);
+
+#endif

app/src/util/net.c

@@ -94,18 +94,13 @@ net_perror(const char *s) {
 }
 
 sc_socket
-net_socket(void) {
+net_connect(uint32_t addr, uint16_t port) {
     sc_raw_socket raw_sock = socket(AF_INET, SOCK_STREAM, 0);
     sc_socket sock = wrap(raw_sock);
     if (sock == SC_INVALID_SOCKET) {
         net_perror("socket");
+        return SC_INVALID_SOCKET;
     }
-    return sock;
-}
-
-bool
-net_connect(sc_socket socket, uint32_t addr, uint16_t port) {
-    sc_raw_socket raw_sock = unwrap(socket);
 
     SOCKADDR_IN sin;
     sin.sin_family = AF_INET;
@@ -114,15 +109,21 @@ net_connect(sc_socket socket, uint32_t addr, uint16_t port) {
 
     if (connect(raw_sock, (SOCKADDR *) &sin, sizeof(sin)) == SOCKET_ERROR) {
         net_perror("connect");
-        return false;
+        net_close(sock);
+        return SC_INVALID_SOCKET;
     }
 
-    return true;
+    return sock;
 }
 
-bool
+sc_socket
-net_listen(sc_socket socket, uint32_t addr, uint16_t port, int backlog) {
+net_listen(uint32_t addr, uint16_t port, int backlog) {
-    sc_raw_socket raw_sock = unwrap(socket);
+    sc_raw_socket raw_sock = socket(AF_INET, SOCK_STREAM, 0);
+    sc_socket sock = wrap(raw_sock);
+    if (sock == SC_INVALID_SOCKET) {
+        net_perror("socket");
+        return SC_INVALID_SOCKET;
+    }
 
     int reuse = 1;
     if (setsockopt(raw_sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &reuse,
@@ -137,15 +138,17 @@ net_listen(sc_socket socket, uint32_t addr, uint16_t port, int backlog) {
 
     if (bind(raw_sock, (SOCKADDR *) &sin, sizeof(sin)) == SOCKET_ERROR) {
         net_perror("bind");
-        return false;
+        net_close(sock);
+        return SC_INVALID_SOCKET;
     }
 
     if (listen(raw_sock, backlog) == SOCKET_ERROR) {
         net_perror("listen");
-        return false;
+        net_close(sock);
+        return SC_INVALID_SOCKET;
     }
 
-    return true;
+    return sock;
 }
 
 sc_socket

app/src/util/net.h

@@ -31,13 +31,10 @@ void
 net_cleanup(void);
 
 sc_socket
-net_socket(void);
+net_connect(uint32_t addr, uint16_t port);
 
-bool
+sc_socket
-net_connect(sc_socket socket, uint32_t addr, uint16_t port);
+net_listen(uint32_t addr, uint16_t port, int backlog);
-
-bool
-net_listen(sc_socket socket, uint32_t addr, uint16_t port, int backlog);
 
 sc_socket
 net_accept(sc_socket server_socket);

app/src/util/process.c

@@ -3,16 +3,22 @@
 #include <libgen.h>
 #include "log.h"
 
+enum sc_process_result
+sc_process_execute(const char *const argv[], sc_pid *pid) {
+    return sc_process_execute_p(argv, pid, NULL, NULL, NULL);
+}
+
 bool
-process_check_success(process_t proc, const char *name, bool close) {
+sc_process_check_success(sc_pid pid, const char *name, bool close) {
-    if (proc == PROCESS_NONE) {
+    if (pid == SC_PROCESS_NONE) {
         LOGE("Could not execute \"%s\"", name);
         return false;
     }
-    exit_code_t exit_code = process_wait(proc, close);
+    sc_exit_code exit_code = sc_process_wait(pid, close);
     if (exit_code) {
-        if (exit_code != NO_EXIT_CODE) {
+        if (exit_code != SC_EXIT_CODE_NONE) {
-            LOGE("\"%s\" returned with value %" PRIexitcode, name, exit_code);
+            LOGE("\"%s\" returned with value %" SC_PRIexitcode, name,
+                 exit_code);
         } else {
             LOGE("\"%s\" exited unexpectedly", name);
         }
@@ -21,52 +27,11 @@ process_check_success(process_t proc, const char *name, bool close) {
     return true;
 }
 
-char *
-get_local_file_path(const char *name) {
-    char *executable_path = get_executable_path();
-    if (!executable_path) {
-        return NULL;
-    }
-
-    // dirname() does not work correctly everywhere, so get the parent
-    // directory manually.
-    // See <https://github.com/Genymobile/scrcpy/issues/2619>
-    char *p = strrchr(executable_path, PATH_SEPARATOR);
-    if (!p) {
-        LOGE("Unexpected executable path: \"%s\" (it should contain a '%c')",
-             executable_path, PATH_SEPARATOR);
-        free(executable_path);
-        return NULL;
-    }
-
-    *p = '\0'; // modify executable_path in place
-    char *dir = executable_path;
-    size_t dirlen = strlen(dir);
-    size_t namelen = strlen(name);
-
-    size_t len = dirlen + namelen + 2; // +2: '/' and '\0'
-    char *file_path = malloc(len);
-    if (!file_path) {
-        LOGE("Could not alloc path");
-        free(executable_path);
-        return NULL;
-    }
-
-    memcpy(file_path, dir, dirlen);
-    file_path[dirlen] = PATH_SEPARATOR;
-    // namelen + 1 to copy the final '\0'
-    memcpy(&file_path[dirlen + 1], name, namelen + 1);
-
-    free(executable_path);
-
-    return file_path;
-}
-
 ssize_t
-read_pipe_all(pipe_t pipe, char *data, size_t len) {
+sc_pipe_read_all(sc_pipe pipe, char *data, size_t len) {
     size_t copied = 0;
     while (len > 0) {
-        ssize_t r = read_pipe(pipe, data, len);
+        ssize_t r = sc_pipe_read(pipe, data, len);
         if (r <= 0) {
             return copied ? (ssize_t) copied : r;
         }

app/src/util/process.h

@@ -10,96 +10,100 @@
  // not needed here, but winsock2.h must never be included AFTER windows.h
 # include <winsock2.h>
 # include <windows.h>
-# define PATH_SEPARATOR '\\'
+# define SC_PRIexitcode "lu"
-# define PRIexitcode "lu"
 // <https://stackoverflow.com/a/44383330/1987178>
-# define PRIsizet "Iu"
+# define SC_PRIsizet "Iu"
-# define PROCESS_NONE NULL
+# define SC_PROCESS_NONE NULL
-# define NO_EXIT_CODE -1u // max value as unsigned
+# define SC_EXIT_CODE_NONE -1u // max value as unsigned
-  typedef HANDLE process_t;
+  typedef HANDLE sc_pid;
-  typedef DWORD exit_code_t;
+  typedef DWORD sc_exit_code;
-  typedef HANDLE pipe_t;
+  typedef HANDLE sc_pipe;
 
 #else
 
 # include <sys/types.h>
-# define PATH_SEPARATOR '/'
+# define SC_PRIsizet "zu"
-# define PRIsizet "zu"
+# define SC_PRIexitcode "d"
-# define PRIexitcode "d"
+# define SC_PROCESS_NONE -1
-# define PROCESS_NONE -1
+# define SC_EXIT_CODE_NONE -1
-# define NO_EXIT_CODE -1
+  typedef pid_t sc_pid;
-  typedef pid_t process_t;
+  typedef int sc_exit_code;
-  typedef int exit_code_t;
+  typedef int sc_pipe;
-  typedef int pipe_t;
 
 #endif
 
-enum process_result {
+enum sc_process_result {
-    PROCESS_SUCCESS,
+    SC_PROCESS_SUCCESS,
-    PROCESS_ERROR_GENERIC,
+    SC_PROCESS_ERROR_GENERIC,
-    PROCESS_ERROR_MISSING_BINARY,
+    SC_PROCESS_ERROR_MISSING_BINARY,
 };
 
-// execute the command and write the result to the output parameter "process"
+/**
-enum process_result
+ * Execute the command and write the process id to `pid`
-process_execute(const char *const argv[], process_t *process);
+ */
+enum sc_process_result
+sc_process_execute(const char *const argv[], sc_pid *pid);
 
-enum process_result
+/**
-process_execute_redirect(const char *const argv[], process_t *process,
+ * Execute the command and write the process id to `pid`
-                         pipe_t *pipe_stdin, pipe_t *pipe_stdout,
+ *
-                         pipe_t *pipe_stderr);
+ * If not NULL, provide a pipe for stdin (`pin`), stdout (`pout`) and stderr
+ * (`perr`).
+ */
+enum sc_process_result
+sc_process_execute_p(const char *const argv[], sc_pid *pid,
+                     sc_pipe *pin, sc_pipe *pout, sc_pipe *perr);
 
+/**
+ * Kill the process
+ */
 bool
-process_terminate(process_t pid);
+sc_process_terminate(sc_pid pid);
 
-// kill the process
+/**
-bool
+ * Wait and close the process (similar to waitpid())
-process_terminate(process_t pid);
+ *
+ * The `close` flag indicates if the process must be _closed_ (reaped) (passing
+ * false is equivalent to enable WNOWAIT in waitid()).
+ */
+sc_exit_code
+sc_process_wait(sc_pid pid, bool close);
 
-// wait and close the process (like waitpid())
+/**
-// the "close" flag indicates if the process must be "closed" (reaped)
+ * Close (reap) the process
-// (passing false is equivalent to enable WNOWAIT in waitid())
+ *
-exit_code_t
+ * Semantically:
-process_wait(process_t pid, bool close);
+ *    sc_process_wait(close) = sc_process_wait(noclose) + sc_process_close()
-
+ */
-// close the process
-//
-// Semantically, process_wait(close) = process_wait(noclose) + process_close
 void
-process_close(process_t pid);
+sc_process_close(sc_pid pid);
 
-// convenience function to wait for a successful process execution
+/**
-// automatically log process errors with the provided process name
+ * Convenience function to wait for a successful process execution
+ *
+ * Automatically log process errors with the provided process name.
+ */
 bool
-process_check_success(process_t proc, const char *name, bool close);
+sc_process_check_success(sc_pid pid, const char *name, bool close);
-
-#ifndef _WIN32
-// only used to find package manager, not implemented for Windows
-bool
-search_executable(const char *file);
-#endif
-
-// return the absolute path of the executable (the scrcpy binary)
-// may be NULL on error; to be freed by free()
-char *
-get_executable_path(void);
-
-// Return the absolute path of a file in the same directory as he executable.
-// May be NULL on error. To be freed by free().
-char *
-get_local_file_path(const char *name);
-
-// returns true if the file exists and is not a directory
-bool
-is_regular_file(const char *path);
 
+/**
+ * Read from the pipe
+ *
+ * Same semantic as read().
+ */
 ssize_t
-read_pipe(pipe_t pipe, char *data, size_t len);
+sc_pipe_read(sc_pipe pipe, char *data, size_t len);
 
+/**
+ * Read exactly `len` chars from a pipe (unless EOF)
+ */
 ssize_t
-read_pipe_all(pipe_t pipe, char *data, size_t len);
+sc_pipe_read_all(sc_pipe pipe, char *data, size_t len);
 
+/**
+ * Close the pipe
+ */
 void
-close_pipe(pipe_t pipe);
+sc_pipe_close(sc_pipe pipe);
 
 #endif

app/src/util/str_util.c

@@ -1,9 +1,11 @@
 #include "str_util.h"
 
+#include <assert.h>
 #include <errno.h>
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
+#include "util/strbuf.h"
 
 #ifdef _WIN32
 # include <windows.h>
@@ -209,3 +211,81 @@ utf8_from_wide_char(const wchar_t *ws) {
 }
 
 #endif
+
+char *sc_str_wrap_lines(const char *input, unsigned columns, unsigned indent) {
+    assert(indent < columns);
+
+    struct sc_strbuf buf;
+
+    // The output string should not be much longer than the input string (just
+    // a few '\n' added), so this initial capacity should hopefully almost
+    // always avoid internal realloc() in string buffer
+    size_t cap = strlen(input) * 3 / 2;
+
+    if (!sc_strbuf_init(&buf, cap)) {
+        return false;
+    }
+
+#define APPEND(S,N) if (!sc_strbuf_append(&buf, S, N)) goto error
+#define APPEND_CHAR(C) if (!sc_strbuf_append_char(&buf, C)) goto error
+#define APPEND_N(C,N) if (!sc_strbuf_append_n(&buf, C, N)) goto error
+#define APPEND_INDENT() if (indent) APPEND_N(' ', indent)
+
+    APPEND_INDENT();
+
+    // The last separator encountered, it must be inserted only conditionnaly,
+    // depending on the next token
+    char pending = 0;
+
+    // col tracks the current column in the current line
+    size_t col = indent;
+    while (*input) {
+        size_t sep_idx = strcspn(input, "\n ");
+        size_t new_col = col + sep_idx;
+        if (pending == ' ') {
+            // The pending space counts
+            ++new_col;
+        }
+        bool wrap = new_col > columns;
+
+        char sep = input[sep_idx];
+        if (sep == ' ')
+            sep = ' ';
+
+        if (wrap) {
+            APPEND_CHAR('\n');
+            APPEND_INDENT();
+            col = indent;
+        } else if (pending) {
+            APPEND_CHAR(pending);
+            ++col;
+            if (pending == '\n')
+            {
+                APPEND_INDENT();
+                col = indent;
+            }
+        }
+
+        if (sep_idx) {
+            APPEND(input, sep_idx);
+            col += sep_idx;
+        }
+
+        pending = sep;
+
+        input += sep_idx;
+        if (*input != '\0') {
+            // Skip the separator
+            ++input;
+        }
+    }
+
+    if (pending)
+        APPEND_CHAR(pending);
+
+    return buf.s;
+
+error:
+    free(buf.s);
+    return NULL;
+}

app/src/util/str_util.h

@@ -62,4 +62,12 @@ char *
 utf8_from_wide_char(const wchar_t *s);
 #endif
 
+/**
+ * Wrap input lines to fit in `columns` columns
+ *
+ * Break input lines at word boundaries (spaces) so that they fit in `columns`
+ * columns, left-indented by `indent` spaces.
+ */
+char *sc_str_wrap_lines(const char *input, unsigned columns, unsigned indent);
+
 #endif

app/src/util/strbuf.c

@@ -0,0 +1,87 @@
+#include "strbuf.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <stdio.h>
+
+bool
+sc_strbuf_init(struct sc_strbuf *buf, size_t init_cap) {
+    buf->s = malloc(init_cap + 1); // +1 for '\0'
+    if (!buf->s) {
+        return false;
+    }
+
+    buf->len = 0;
+    buf->cap = init_cap;
+    return true;
+}
+
+static bool
+sc_strbuf_reserve(struct sc_strbuf *buf, size_t len) {
+    if (buf->len + len > buf->cap) {
+        size_t new_cap = buf->cap * 3 / 2 + len;
+        char *s = realloc(buf->s, new_cap + 1); // +1 for '\0'
+        if (!s) {
+            // Leave the old buf->s
+            return false;
+        }
+        buf->s = s;
+        buf->cap = new_cap;
+    }
+    return true;
+}
+
+bool
+sc_strbuf_append(struct sc_strbuf *buf, const char *s, size_t len) {
+    assert(s);
+    assert(*s);
+    assert(strlen(s) >= len);
+    if (!sc_strbuf_reserve(buf, len)) {
+        return false;
+    }
+
+    memcpy(&buf->s[buf->len], s, len);
+    buf->len += len;
+    buf->s[buf->len] = '\0';
+
+    return true;
+}
+
+bool
+sc_strbuf_append_char(struct sc_strbuf *buf, const char c) {
+    if (!sc_strbuf_reserve(buf, 1)) {
+        return false;
+    }
+
+    buf->s[buf->len] = c;
+    buf->len ++;
+    buf->s[buf->len] = '\0';
+
+    return true;
+}
+
+bool
+sc_strbuf_append_n(struct sc_strbuf *buf, const char c, size_t n) {
+    if (!sc_strbuf_reserve(buf, n)) {
+        return false;
+    }
+
+    memset(&buf->s[buf->len], c, n);
+    buf->len += n;
+    buf->s[buf->len] = '\0';
+
+    return true;
+}
+
+void
+sc_strbuf_shrink(struct sc_strbuf *buf) {
+    assert(buf->len <= buf->cap);
+    if (buf->len != buf->cap) {
+        char *s = realloc(buf->s, buf->len + 1); // +1 for '\0'
+        assert(s); // decreasing the size may not fail
+        buf->s = s;
+        buf->cap = buf->len;
+    }
+}

app/src/util/strbuf.h

@@ -0,0 +1,73 @@
+#ifndef SC_STRBUF_H
+#define SC_STRBUF_H
+
+#include "common.h"
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <string.h>
+
+struct sc_strbuf {
+    char *s;
+    size_t len;
+    size_t cap;
+};
+
+/**
+ * Initialize the string buffer
+ *
+ * `buf->s` must be manually freed by the caller.
+ */
+bool
+sc_strbuf_init(struct sc_strbuf *buf, size_t init_cap);
+
+/**
+ * Append a string
+ *
+ * Append `len` characters from `s` to the buffer.
+ */
+bool
+sc_strbuf_append(struct sc_strbuf *buf, const char *s, size_t len);
+
+/**
+ * Append a char
+ *
+ * Append a single character to the buffer.
+ */
+bool
+sc_strbuf_append_char(struct sc_strbuf *buf, const char c);
+
+/**
+ * Append a char `n` times
+ *
+ * Append the same characters `n` times to the buffer.
+ */
+bool
+sc_strbuf_append_n(struct sc_strbuf *buf, const char c, size_t n);
+
+/**
+ * Append a NUL-terminated string
+ */
+static inline bool
+sc_strbuf_append_str(struct sc_strbuf *buf, const char *s) {
+    return sc_strbuf_append(buf, s, strlen(s));
+}
+
+/**
+ * Append a static string
+ *
+ * Append a string whose size is known at compile time (for
+ * example a string literal).
+ */
+#define sc_strbuf_append_staticstr(BUF, S) \
+    sc_strbuf_append(BUF, S, sizeof(S) - 1)
+
+/**
+ * Shrink the buffer capacity to its current length
+ *
+ * This resizes `buf->s` to fit the content.
+ */
+void
+sc_strbuf_shrink(struct sc_strbuf *buf);
+
+#endif

app/src/util/term.c

@@ -0,0 +1,51 @@
+#include "term.h"
+
+#include <assert.h>
+
+#ifdef _WIN32
+# include <windows.h>
+#else
+# include <unistd.h>
+# include <sys/ioctl.h>
+#endif
+
+bool
+sc_term_get_size(unsigned *rows, unsigned *cols) {
+#ifdef _WIN32
+    CONSOLE_SCREEN_BUFFER_INFO csbi;
+
+    bool ok =
+        GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
+    if (!ok) {
+        return false;
+    }
+
+    if (rows) {
+        assert(csbi.srWindow.Bottom >= csbi.srWindow.Top);
+        *rows = csbi.srWindow.Bottom - csbi.srWindow.Top + 1;
+    }
+
+    if (cols) {
+        assert(csbi.srWindow.Right >= csbi.srWindow.Left);
+        *cols = csbi.srWindow.Right - csbi.srWindow.Left + 1;
+    }
+
+    return true;
+#else
+    struct winsize ws;
+    int r = ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
+    if (r == -1) {
+        return false;
+    }
+
+    if (rows) {
+        *rows = ws.ws_row;
+    }
+
+    if (cols) {
+        *cols = ws.ws_col;
+    }
+
+    return true;
+#endif
+}

app/src/util/term.h

@@ -0,0 +1,21 @@
+#ifndef SC_TERM_H
+#define SC_TERM_H
+
+#include "common.h"
+
+#include <stdbool.h>
+
+/**
+ * Return the terminal dimensions
+ *
+ * Return false if the dimensions could not be retrieved.
+ *
+ * Otherwise, return true, and:
+ *  - if `rows` is not NULL, then the number of rows is written to `*rows`.
+ *  - if `columns` is not NULL, then the number of columns is written to
+ *    `*columns`.
+ */
+bool
+sc_term_get_size(unsigned *rows, unsigned *cols);
+
+#endif

app/src/util/tick.h

@@ -1,6 +1,8 @@
 #ifndef SC_TICK_H
 #define SC_TICK_H
 
+#include "common.h"
+
 #include <stdint.h>
 
 typedef int64_t sc_tick;

app/tests/test_strbuf.c

@@ -0,0 +1,47 @@
+#include "common.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "util/strbuf.h"
+
+static void test_strbuf_simple(void) {
+    struct sc_strbuf buf;
+    bool ok = sc_strbuf_init(&buf, 10);
+    assert(ok);
+
+    ok = sc_strbuf_append_staticstr(&buf, "Hello");
+    assert(ok);
+
+    ok = sc_strbuf_append_char(&buf, ' ');
+    assert(ok);
+
+    ok = sc_strbuf_append_staticstr(&buf, "world");
+    assert(ok);
+
+    ok = sc_strbuf_append_staticstr(&buf, "!\n");
+    assert(ok);
+
+    ok = sc_strbuf_append_staticstr(&buf, "This is a test");
+    assert(ok);
+
+    ok = sc_strbuf_append_n(&buf, '.', 3);
+    assert(ok);
+
+    assert(!strcmp(buf.s, "Hello world!\nThis is a test..."));
+
+    sc_strbuf_shrink(&buf);
+    assert(buf.len == buf.cap);
+    assert(!strcmp(buf.s, "Hello world!\nThis is a test..."));
+
+    free(buf.s);
+}
+
+int main(int argc, char *argv[]) {
+    (void) argc;
+    (void) argv;
+
+    test_strbuf_simple();
+    return 0;
+}

app/tests/test_strutil.c

@@ -299,6 +299,44 @@ static void test_strlist_contains(void) {
     assert(strlist_contains("xyz", '\0', "xyz"));
 }
 
+static void test_wrap_lines(void) {
+    const char *s = "This is a text to test line wrapping. The lines must be "
+                    "wrapped at a space or a line break.\n"
+                    "\n"
+                    "This rectangle must remains a rectangle because it is "
+                    "drawn in lines having lengths lower than the specified "
+                    "number of columns:\n"
+                    "  +----+\n"
+                    "  |    |\n"
+                    "  +----+\n";
+
+    //                     |----      1    1    2  2|
+    //                     |0    5    0    5    0  3| <-- 24 columns
+    const char *expected = "    This is a text to\n"
+                           "    test line wrapping.\n"
+                           "    The lines must be\n"
+                           "    wrapped at a space\n"
+                           "    or a line break.\n"
+                           "    \n"
+                           "    This rectangle must\n"
+                           "    remains a rectangle\n"
+                           "    because it is drawn\n"
+                           "    in lines having\n"
+                           "    lengths lower than\n"
+                           "    the specified number\n"
+                           "    of columns:\n"
+                           "      +----+\n"
+                           "      |    |\n"
+                           "      +----+\n";
+
+    char *formatted = sc_str_wrap_lines(s, 24, 4);
+    assert(formatted);
+
+    assert(!strcmp(formatted, expected));
+
+    free(formatted);
+}
+
 int main(int argc, char *argv[]) {
     (void) argc;
     (void) argv;
@@ -317,5 +355,6 @@ int main(int argc, char *argv[]) {
     test_parse_integers();
     test_parse_integer_with_suffix();
     test_strlist_contains();
+    test_wrap_lines();
     return 0;
 }