sanitizer_posix.cc revision b78caa645f70eff2f037f1f8bb43ca9129dbd8d9 
1//===-- sanitizer_posix.cc ------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is shared between AddressSanitizer and ThreadSanitizer
11// run-time libraries and implements POSIX-specific functions from
12// sanitizer_libc.h.
13//===----------------------------------------------------------------------===//
14#if defined(__linux__) || defined(__APPLE__)
15
16#include "sanitizer_common.h"
17#include "sanitizer_libc.h"
18#include "sanitizer_procmaps.h"
19
20#include <pthread.h>
21#include <stdarg.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <sys/mman.h>
25#include <sys/resource.h>
26#include <sys/time.h>
27#include <sys/types.h>
28#include <unistd.h>
29
30namespace __sanitizer {
31
32// ------------- sanitizer_common.h
33
34int GetPid() {
35  return getpid();
36}
37
38uptr GetThreadSelf() {
39  return (uptr)pthread_self();
40}
41
42void *MmapOrDie(uptr size, const char *mem_type) {
43  size = RoundUpTo(size, kPageSize);
44  void *res = internal_mmap(0, size,
45                            PROT_READ | PROT_WRITE,
46                            MAP_PRIVATE | MAP_ANON, -1, 0);
47  if (res == (void*)-1) {
48    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s\n",
49           size, size, mem_type);
50    CHECK("unable to mmap" && 0);
51  }
52  return res;
53}
54
55void UnmapOrDie(void *addr, uptr size) {
56  if (!addr || !size) return;
57  int res = internal_munmap(addr, size);
58  if (res != 0) {
59    Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
60           size, size, addr);
61    CHECK("unable to unmap" && 0);
62  }
63}
64
65void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
66  return internal_mmap((void*)fixed_addr, size,
67                      PROT_READ | PROT_WRITE,
68                      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
69                      -1, 0);
70}
71
72void *Mprotect(uptr fixed_addr, uptr size) {
73  return internal_mmap((void*)fixed_addr, size,
74                       PROT_NONE,
75                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
76                       -1, 0);
77}
78
79void *MapFileToMemory(const char *file_name, uptr *buff_size) {
80  fd_t fd = internal_open(file_name, false);
81  CHECK_NE(fd, kInvalidFd);
82  uptr fsize = internal_filesize(fd);
83  CHECK_NE(fsize, (uptr)-1);
84  CHECK_GT(fsize, 0);
85  *buff_size = RoundUpTo(fsize, kPageSize);
86  void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
87  return (map == MAP_FAILED) ? 0 : map;
88}
89
90
91static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
92                                        uptr start2, uptr end2) {
93  CHECK(start1 <= end1);
94  CHECK(start2 <= end2);
95  return (end1 < start2) || (end2 < start1);
96}
97
98// FIXME: this is thread-unsafe, but should not cause problems most of the time.
99// When the shadow is mapped only a single thread usually exists (plus maybe
100// several worker threads on Mac, which aren't expected to map big chunks of
101// memory).
102bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
103  ProcessMaps procmaps;
104  uptr start, end;
105  while (procmaps.Next(&start, &end,
106                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
107    if (!IntervalsAreSeparate(start, end, range_start, range_end))
108      return false;
109  }
110  return true;
111}
112
113void DumpProcessMap() {
114  ProcessMaps proc_maps;
115  uptr start, end;
116  const sptr kBufSize = 4095;
117  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
118  Report("Process memory map follows:\n");
119  while (proc_maps.Next(&start, &end, /* file_offset */0,
120                        filename, kBufSize)) {
121    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
122  }
123  Report("End of process memory map.\n");
124  UnmapOrDie(filename, kBufSize);
125}
126
127const char *GetPwd() {
128  return GetEnv("PWD");
129}
130
131void DisableCoreDumper() {
132  struct rlimit nocore;
133  nocore.rlim_cur = 0;
134  nocore.rlim_max = 0;
135  setrlimit(RLIMIT_CORE, &nocore);
136}
137
138void SleepForSeconds(int seconds) {
139  sleep(seconds);
140}
141
142void SleepForMillis(int millis) {
143  usleep(millis * 1000);
144}
145
146void Exit(int exitcode) {
147  _exit(exitcode);
148}
149
150void Abort() {
151  abort();
152}
153
154int Atexit(void (*function)(void)) {
155#ifndef SANITIZER_GO
156  return atexit(function);
157#else
158  return 0;
159#endif
160}
161
162}  // namespace __sanitizer
163
164#endif  // __linux__ || __APPLE_
165