зеркало из https://github.com/mozilla/gecko-dev.git
265 строки
11 KiB
C++
265 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <pthread.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <android/log.h>
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#include <sys/syscall.h>
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#include "mozilla/Alignment.h"
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#include <vector>
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#define NS_EXPORT __attribute__ ((visibility("default")))
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#if ANDROID_VERSION < 17 || defined(MOZ_WIDGET_ANDROID)
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/* Android doesn't have pthread_atfork(), so we need to use our own. */
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struct AtForkFuncs {
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void (*prepare)(void);
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void (*parent)(void);
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void (*child)(void);
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};
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/* jemalloc's initialization calls pthread_atfork. When pthread_atfork (see
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* further below) stores the corresponding data, it's going to allocate memory,
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* which will loop back to jemalloc's initialization, leading to a dead-lock.
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* So, for that specific vector, we use a special allocator that returns a
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* static buffer for small sizes, and force the initial vector capacity to
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* a size enough to store one atfork function table. */
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template <typename T>
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struct SpecialAllocator: public std::allocator<T>
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{
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SpecialAllocator(): bufUsed(false) {}
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inline typename std::allocator<T>::pointer allocate(typename std::allocator<T>::size_type n, const void * = 0) {
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if (!bufUsed && n == 1) {
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bufUsed = true;
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return buf.addr();
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}
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return reinterpret_cast<T *>(::operator new(sizeof(T) * n));
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}
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inline void deallocate(typename std::allocator<T>::pointer p, typename std::allocator<T>::size_type n) {
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if (p == buf.addr())
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bufUsed = false;
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else
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::operator delete(p);
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}
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template<typename U>
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struct rebind {
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typedef SpecialAllocator<U> other;
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};
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private:
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mozilla::AlignedStorage2<T> buf;
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bool bufUsed;
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};
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static std::vector<AtForkFuncs, SpecialAllocator<AtForkFuncs> > atfork;
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#endif
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#ifdef MOZ_WIDGET_GONK
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#include "cpuacct.h"
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#define WRAP(x) x
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#if ANDROID_VERSION < 17 || defined(MOZ_WIDGET_ANDROID)
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extern "C" NS_EXPORT int
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timer_create(clockid_t, struct sigevent*, timer_t*)
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{
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__android_log_print(ANDROID_LOG_ERROR, "BionicGlue", "timer_create not supported!");
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abort();
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return -1;
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}
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#endif
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#else
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#define cpuacct_add(x)
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#define WRAP(x) __wrap_##x
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#endif
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#if ANDROID_VERSION < 17 || defined(MOZ_WIDGET_ANDROID)
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extern "C" NS_EXPORT int
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WRAP(pthread_atfork)(void (*prepare)(void), void (*parent)(void), void (*child)(void))
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{
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AtForkFuncs funcs;
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funcs.prepare = prepare;
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funcs.parent = parent;
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funcs.child = child;
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if (!atfork.capacity())
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atfork.reserve(1);
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atfork.push_back(funcs);
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return 0;
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}
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extern "C" NS_EXPORT pid_t __fork(void);
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extern "C" NS_EXPORT pid_t
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WRAP(fork)(void)
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{
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pid_t pid;
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for (auto it = atfork.rbegin();
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it < atfork.rend(); ++it)
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if (it->prepare)
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it->prepare();
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switch ((pid = syscall(__NR_clone, SIGCHLD, NULL, NULL, NULL, NULL))) {
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case 0:
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cpuacct_add(getuid());
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for (auto it = atfork.begin();
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it < atfork.end(); ++it)
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if (it->child)
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it->child();
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break;
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default:
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for (auto it = atfork.begin();
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it < atfork.end(); ++it)
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if (it->parent)
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it->parent();
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}
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return pid;
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}
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#endif
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extern "C" NS_EXPORT int
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WRAP(raise)(int sig)
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{
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// Bug 741272: Bionic incorrectly uses kill(), which signals the
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// process, and thus could signal another thread (and let this one
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// return "successfully" from raising a fatal signal).
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//
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// Bug 943170: POSIX specifies pthread_kill(pthread_self(), sig) as
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// equivalent to raise(sig), but Bionic also has a bug with these
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// functions, where a forked child will kill its parent instead.
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extern pid_t gettid(void);
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return syscall(__NR_tgkill, getpid(), gettid(), sig);
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}
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/*
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* The following wrappers for PR_Xxx are needed until we can get
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* PR_DuplicateEnvironment landed in NSPR.
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* See see bug 772734 and bug 773414.
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*
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* We can't #include the pr headers here, and we can't call any of the
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* PR/PL functions either, so we just reimplemnt using native code.
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*/
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static pthread_mutex_t _pr_envLock = PTHREAD_MUTEX_INITIALIZER;
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extern "C" NS_EXPORT char*
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__wrap_PR_GetEnv(const char *var)
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{
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char *ev;
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pthread_mutex_lock(&_pr_envLock);
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ev = getenv(var);
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pthread_mutex_unlock(&_pr_envLock);
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return ev;
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}
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extern "C" NS_EXPORT int
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__wrap_PR_SetEnv(const char *string)
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{
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int result;
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if ( !strchr(string, '=')) return(-1);
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pthread_mutex_lock(&_pr_envLock);
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result = putenv(string);
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pthread_mutex_unlock(&_pr_envLock);
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return (result)? -1 : 0;
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}
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extern "C" NS_EXPORT pthread_mutex_t *
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PR_GetEnvLock(void)
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{
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return &_pr_envLock;
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}
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/* Amazon Kindle Fire HD's libc provides most of the
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* functions in string.h as weak symbols, which dlsym
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* cannot resolve. Thus, we must wrap these functions.
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* See bug 791419.
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*/
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#ifndef MOZ_WIDGET_GONK
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#include <string.h>
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extern "C" NS_EXPORT void* __real_memccpy(void * a0, const void * a1, int a2, size_t a3);
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extern "C" NS_EXPORT void* __real_memchr(const void * a0, int a1, size_t a2);
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extern "C" NS_EXPORT void* __real_memrchr(const void * a0, int a1, size_t a2);
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extern "C" NS_EXPORT int __real_memcmp(const void * a0, const void * a1, size_t a2);
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extern "C" NS_EXPORT void* __real_memcpy(void * a0, const void * a1, size_t a2);
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extern "C" NS_EXPORT void* __real_memmove(void * a0, const void * a1, size_t a2);
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extern "C" NS_EXPORT void* __real_memset(void * a0, int a1, size_t a2);
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extern "C" NS_EXPORT void* __real_memmem(const void * a0, size_t a1, const void * a2, size_t a3);
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extern "C" NS_EXPORT char* __real_index(const char * a0, int a1);
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extern "C" NS_EXPORT char* __real_strchr(const char * a0, int a1);
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extern "C" NS_EXPORT char* __real_strrchr(const char * a0, int a1);
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extern "C" NS_EXPORT size_t __real_strlen(const char * a0);
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extern "C" NS_EXPORT int __real_strcmp(const char * a0, const char * a1);
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extern "C" NS_EXPORT char* __real_strcpy(char * a0, const char * a1);
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extern "C" NS_EXPORT char* __real_strcat(char * a0, const char * a1);
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extern "C" NS_EXPORT int __real_strcasecmp(const char * a0, const char * a1);
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extern "C" NS_EXPORT int __real_strncasecmp(const char * a0, const char * a1, size_t a2);
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extern "C" NS_EXPORT char* __real_strstr(const char * a0, const char * a1);
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extern "C" NS_EXPORT char* __real_strcasestr(const char * a0, const char * a1);
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extern "C" NS_EXPORT char* __real_strtok(char * a0, const char * a1);
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extern "C" NS_EXPORT char* __real_strtok_r(char * a0, const char * a1, char** a2);
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extern "C" NS_EXPORT char* __real_strerror(int a0);
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extern "C" NS_EXPORT int __real_strerror_r(int a0, char * a1, size_t a2);
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extern "C" NS_EXPORT size_t __real_strnlen(const char * a0, size_t a1);
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extern "C" NS_EXPORT char* __real_strncat(char * a0, const char * a1, size_t a2);
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extern "C" NS_EXPORT int __real_strncmp(const char * a0, const char * a1, size_t a2);
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extern "C" NS_EXPORT char* __real_strncpy(char * a0, const char * a1, size_t a2);
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extern "C" NS_EXPORT size_t __real_strlcat(char * a0, const char * a1, size_t a2);
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extern "C" NS_EXPORT size_t __real_strlcpy(char * a0, const char * a1, size_t a2);
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extern "C" NS_EXPORT size_t __real_strcspn(const char * a0, const char * a1);
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extern "C" NS_EXPORT char* __real_strpbrk(const char * a0, const char * a1);
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extern "C" NS_EXPORT char* __real_strsep(char ** a0, const char * a1);
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extern "C" NS_EXPORT size_t __real_strspn(const char * a0, const char * a1);
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extern "C" NS_EXPORT int __real_strcoll(const char * a0, const char * a1);
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extern "C" NS_EXPORT size_t __real_strxfrm(char * a0, const char * a1, size_t a2);
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extern "C" NS_EXPORT void* __wrap_memccpy(void * a0, const void * a1, int a2, size_t a3) { return __real_memccpy(a0, a1, a2, a3); }
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extern "C" NS_EXPORT void* __wrap_memchr(const void * a0, int a1, size_t a2) { return __real_memchr(a0, a1, a2); }
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extern "C" NS_EXPORT void* __wrap_memrchr(const void * a0, int a1, size_t a2) { return __real_memrchr(a0, a1, a2); }
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extern "C" NS_EXPORT int __wrap_memcmp(const void * a0, const void * a1, size_t a2) { return __real_memcmp(a0, a1, a2); }
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extern "C" NS_EXPORT void* __wrap_memcpy(void * a0, const void * a1, size_t a2) { return __real_memcpy(a0, a1, a2); }
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extern "C" NS_EXPORT void* __wrap_memmove(void * a0, const void * a1, size_t a2) { return __real_memmove(a0, a1, a2); }
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extern "C" NS_EXPORT void* __wrap_memset(void * a0, int a1, size_t a2) { return __real_memset(a0, a1, a2); }
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extern "C" NS_EXPORT void* __wrap_memmem(const void * a0, size_t a1, const void * a2, size_t a3) { return __real_memmem(a0, a1, a2, a3); }
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extern "C" NS_EXPORT char* __wrap_index(const char * a0, int a1) { return __real_index(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strchr(const char * a0, int a1) { return __real_strchr(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strrchr(const char * a0, int a1) { return __real_strrchr(a0, a1); }
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extern "C" NS_EXPORT size_t __wrap_strlen(const char * a0) { return __real_strlen(a0); }
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extern "C" NS_EXPORT int __wrap_strcmp(const char * a0, const char * a1) { return __real_strcmp(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strcpy(char * a0, const char * a1) { return __real_strcpy(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strcat(char * a0, const char * a1) { return __real_strcat(a0, a1); }
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extern "C" NS_EXPORT int __wrap_strcasecmp(const char * a0, const char * a1) { return __real_strcasecmp(a0, a1); }
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extern "C" NS_EXPORT int __wrap_strncasecmp(const char * a0, const char * a1, size_t a2) { return __real_strncasecmp(a0, a1, a2); }
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extern "C" NS_EXPORT char* __wrap_strstr(const char * a0, const char * a1) { return __real_strstr(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strcasestr(const char * a0, const char * a1) { return __real_strcasestr(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strtok(char * a0, const char * a1) { return __real_strtok(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strtok_r(char * a0, const char * a1, char** a2) { return __real_strtok_r(a0, a1, a2); }
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extern "C" NS_EXPORT char* __wrap_strerror(int a0) { return __real_strerror(a0); }
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extern "C" NS_EXPORT int __wrap_strerror_r(int a0, char * a1, size_t a2) { return __real_strerror_r(a0, a1, a2); }
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extern "C" NS_EXPORT size_t __wrap_strnlen(const char * a0, size_t a1) { return __real_strnlen(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strncat(char * a0, const char * a1, size_t a2) { return __real_strncat(a0, a1, a2); }
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extern "C" NS_EXPORT int __wrap_strncmp(const char * a0, const char * a1, size_t a2) { return __real_strncmp(a0, a1, a2); }
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extern "C" NS_EXPORT char* __wrap_strncpy(char * a0, const char * a1, size_t a2) { return __real_strncpy(a0, a1, a2); }
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extern "C" NS_EXPORT size_t __wrap_strlcat(char * a0, const char * a1, size_t a2) { return __real_strlcat(a0, a1, a2); }
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extern "C" NS_EXPORT size_t __wrap_strlcpy(char * a0, const char * a1, size_t a2) { return __real_strlcpy(a0, a1, a2); }
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extern "C" NS_EXPORT size_t __wrap_strcspn(const char * a0, const char * a1) { return __real_strcspn(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strpbrk(const char * a0, const char * a1) { return __real_strpbrk(a0, a1); }
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extern "C" NS_EXPORT char* __wrap_strsep(char ** a0, const char * a1) { return __real_strsep(a0, a1); }
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extern "C" NS_EXPORT size_t __wrap_strspn(const char * a0, const char * a1) { return __real_strspn(a0, a1); }
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extern "C" NS_EXPORT int __wrap_strcoll(const char * a0, const char * a1) { return __real_strcoll(a0, a1); }
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extern "C" NS_EXPORT size_t __wrap_strxfrm(char * a0, const char * a1, size_t a2) { return __real_strxfrm(a0, a1, a2); }
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#endif
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