forked from OSchip/llvm-project
123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
//===-- sanitizer_posix_libcdep.cc ----------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries and implements libc-dependent POSIX-specific functions
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// from sanitizer_libc.h.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_LINUX || SANITIZER_MAC
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#include "sanitizer_common.h"
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#include "sanitizer_stacktrace.h"
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace __sanitizer {
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u32 GetUid() {
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return getuid();
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}
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uptr GetThreadSelf() {
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return (uptr)pthread_self();
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}
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void FlushUnneededShadowMemory(uptr addr, uptr size) {
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madvise((void*)addr, size, MADV_DONTNEED);
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}
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void DisableCoreDumper() {
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struct rlimit nocore;
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nocore.rlim_cur = 0;
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nocore.rlim_max = 0;
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setrlimit(RLIMIT_CORE, &nocore);
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}
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bool StackSizeIsUnlimited() {
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struct rlimit rlim;
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CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
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return (rlim.rlim_cur == (uptr)-1);
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}
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void SetStackSizeLimitInBytes(uptr limit) {
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struct rlimit rlim;
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rlim.rlim_cur = limit;
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rlim.rlim_max = limit;
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if (setrlimit(RLIMIT_STACK, &rlim)) {
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Report("ERROR: %s setrlimit() failed %d\n", SanitizerToolName, errno);
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Die();
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}
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CHECK(!StackSizeIsUnlimited());
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}
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void SleepForSeconds(int seconds) {
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sleep(seconds);
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}
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void SleepForMillis(int millis) {
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usleep(millis * 1000);
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}
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void Abort() {
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abort();
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}
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int Atexit(void (*function)(void)) {
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#ifndef SANITIZER_GO
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return atexit(function);
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#else
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return 0;
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#endif
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}
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int internal_isatty(fd_t fd) {
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return isatty(fd);
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}
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// TODO(glider): different tools may require different altstack size.
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static const uptr kAltStackSize = SIGSTKSZ * 4; // SIGSTKSZ is not enough.
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void SetAlternateSignalStack() {
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stack_t altstack, oldstack;
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CHECK_EQ(0, sigaltstack(0, &oldstack));
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// If the alternate stack is already in place, do nothing.
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if ((oldstack.ss_flags & SS_DISABLE) == 0) return;
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// TODO(glider): the mapped stack should have the MAP_STACK flag in the
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// future. It is not required by man 2 sigaltstack now (they're using
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// malloc()).
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void* base = MmapOrDie(kAltStackSize, __FUNCTION__);
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altstack.ss_sp = base;
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altstack.ss_flags = 0;
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altstack.ss_size = kAltStackSize;
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CHECK_EQ(0, sigaltstack(&altstack, 0));
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}
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void UnsetAlternateSignalStack() {
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stack_t altstack, oldstack;
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altstack.ss_sp = 0;
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altstack.ss_flags = SS_DISABLE;
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altstack.ss_size = 0;
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CHECK_EQ(0, sigaltstack(&altstack, &oldstack));
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UnmapOrDie(oldstack.ss_sp, oldstack.ss_size);
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}
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} // namespace __sanitizer
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#endif
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