0054cbd4db
To check for robustness against EINTR from syscalls, add an interrupter library that can be preloaded with LD_PRELOAD. Change-Id: I0a6cd8702ec5bc6b2927a5e223ee3cdc033860a2
80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/*
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* Copyright 2012, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define CONCATENATE(arg1, arg2) CONCATENATE1(arg1, arg2)
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#define CONCATENATE1(arg1, arg2) CONCATENATE2(arg1, arg2)
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#define CONCATENATE2(arg1, arg2) arg1##arg2
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#define INTERRUPTER(sym) \
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if (real_##sym == NULL) \
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__init_##sym(); \
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if (maybe_interrupt()) { \
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errno = EINTR; \
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return -1; \
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}
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#define CALL_FUNCTION_1(sym, ret, type1) \
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ret (*real_##sym)(type1) = NULL; \
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ret sym(type1 arg1) { \
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INTERRUPTER(sym) \
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return real_##sym(arg1); \
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}
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#define CALL_FUNCTION_2(sym, ret, type1, type2) \
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ret (*real_##sym)(type1, type2) = NULL; \
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ret sym(type1 arg1, type2 arg2) { \
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INTERRUPTER(sym) \
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return real_##sym(arg1, arg2); \
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}
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#define CALL_FUNCTION_3(sym, ret, type1, type2, type3) \
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ret (*real_##sym)(type1, type2, type3) = NULL; \
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ret sym(type1 arg1, type2 arg2, type3 arg3) { \
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INTERRUPTER(sym) \
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return real_##sym(arg1, arg2, arg3); \
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}
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#define CALL_FUNCTION_4(sym, ret, type1, type2, type3, type4) \
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ret (*real_##sym)(type1, type2, type3, type4) = NULL; \
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ret sym(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \
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INTERRUPTER(sym) \
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return real_##sym(arg1, arg2, arg3, arg4); \
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}
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#define CALL_FUNCTION_5(sym, ret, type1, type2, type3, type4, type5) \
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ret (*real_##sym)(type1, type2, type3, type4, type5) = NULL; \
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ret sym(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) { \
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INTERRUPTER(sym) \
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return real_##sym(arg1, arg2, arg3, arg4, arg5); \
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}
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#define DEFINE_INTERCEPT_N(N, sym, ret, ...) \
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static void __init_##sym(void); \
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CONCATENATE(CALL_FUNCTION_, N)(sym, ret, __VA_ARGS__) \
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static void __init_##sym(void) { \
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real_##sym = dlsym(RTLD_NEXT, #sym); \
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if (real_##sym == NULL) { \
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fprintf(stderr, "Error hooking " #sym ": %s\n", dlerror()); \
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} \
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}
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#define INTERCEPT_NARG(...) INTERCEPT_NARG_N(__VA_ARGS__, INTERCEPT_RSEQ_N())
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#define INTERCEPT_NARG_N(...) INTERCEPT_ARG_N(__VA_ARGS__)
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#define INTERCEPT_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, N, ...) N
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#define INTERCEPT_RSEQ_N() 8, 7, 6, 5, 4, 3, 2, 1, 0
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#define DEFINE_INTERCEPT(sym, ret, ...) DEFINE_INTERCEPT_N(INTERCEPT_NARG(__VA_ARGS__), sym, ret, __VA_ARGS__)
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