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📁 ..
📄 sancov_flags.cpp(1.64 KB)
📄 sancov_flags.h(1.08 KB)
📄 sancov_flags.inc(777 B)
📄 sanitizer_addrhashmap.h(9.19 KB)
📄 sanitizer_allocator.cpp(8.73 KB)
📄 sanitizer_allocator.h(2.69 KB)
📄 sanitizer_allocator_bytemap.h(3.12 KB)
📄 sanitizer_allocator_checks.cpp(686 B)
📄 sanitizer_allocator_checks.h(2.67 KB)
📄 sanitizer_allocator_combined.h(6.29 KB)
📄 sanitizer_allocator_interface.h(1.83 KB)
📄 sanitizer_allocator_internal.h(2.03 KB)
📄 sanitizer_allocator_local_cache.h(8.95 KB)
📄 sanitizer_allocator_primary32.h(12.64 KB)
📄 sanitizer_allocator_primary64.h(32.71 KB)
📄 sanitizer_allocator_report.cpp(4.68 KB)
📄 sanitizer_allocator_report.h(1.72 KB)
📄 sanitizer_allocator_secondary.h(10.78 KB)
📄 sanitizer_allocator_size_class_map.h(10.12 KB)
📄 sanitizer_allocator_stats.h(2.76 KB)
📄 sanitizer_asm.h(2.57 KB)
📄 sanitizer_atomic.h(1.97 KB)
📄 sanitizer_atomic_clang.h(3.42 KB)
📄 sanitizer_atomic_clang_mips.h(3.77 KB)
📄 sanitizer_atomic_clang_other.h(3.02 KB)
📄 sanitizer_atomic_clang_x86.h(3.77 KB)
📄 sanitizer_atomic_msvc.h(8.53 KB)
📄 sanitizer_bitvector.h(9.43 KB)
📄 sanitizer_bvgraph.h(4.62 KB)
📄 sanitizer_common.cpp(10.13 KB)
📄 sanitizer_common.h(30.64 KB)
📄 sanitizer_common_interceptors.inc(348.66 KB)
📄 sanitizer_common_interceptors_format.inc(16.84 KB)
📄 sanitizer_common_interceptors_ioctl.inc(22.13 KB)
📄 sanitizer_common_interceptors_netbsd_compat.inc(4.07 KB)
📄 sanitizer_common_interceptors_vfork_aarch64.inc.S(1.23 KB)
📄 sanitizer_common_interceptors_vfork_arm.inc.S(1.24 KB)
📄 sanitizer_common_interceptors_vfork_i386.inc.S(1.66 KB)
📄 sanitizer_common_interceptors_vfork_x86_64.inc.S(1.03 KB)
📄 sanitizer_common_interface.inc(2.05 KB)
📄 sanitizer_common_interface_posix.inc(732 B)
📄 sanitizer_common_libcdep.cpp(5.4 KB)
📄 sanitizer_common_nolibc.cpp(1.12 KB)
📄 sanitizer_common_syscalls.inc(85 KB)
📄 sanitizer_coverage_fuchsia.cpp(10.1 KB)
📄 sanitizer_coverage_interface.inc(1.73 KB)
📄 sanitizer_coverage_libcdep_new.cpp(7.39 KB)
📄 sanitizer_coverage_win_dll_thunk.cpp(1.03 KB)
📄 sanitizer_coverage_win_dynamic_runtime_thunk.cpp(1.16 KB)
📄 sanitizer_coverage_win_sections.cpp(3.36 KB)
📄 sanitizer_coverage_win_weak_interception.cpp(1.17 KB)
📄 sanitizer_dbghelp.h(1.44 KB)
📄 sanitizer_deadlock_detector.h(13.28 KB)
📄 sanitizer_deadlock_detector1.cpp(5.6 KB)
📄 sanitizer_deadlock_detector2.cpp(10.84 KB)
📄 sanitizer_deadlock_detector_interface.h(2.66 KB)
📄 sanitizer_errno.cpp(1.09 KB)
📄 sanitizer_errno.h(1.3 KB)
📄 sanitizer_errno_codes.h(1.1 KB)
📄 sanitizer_file.cpp(6.24 KB)
📄 sanitizer_file.h(3.67 KB)
📄 sanitizer_flag_parser.cpp(5.55 KB)
📄 sanitizer_flag_parser.h(5.71 KB)
📄 sanitizer_flags.cpp(3.95 KB)
📄 sanitizer_flags.h(2.13 KB)
📄 sanitizer_flags.inc(12.73 KB)
📄 sanitizer_freebsd.h(3.31 KB)
📄 sanitizer_fuchsia.cpp(16.58 KB)
📄 sanitizer_fuchsia.h(1.03 KB)
📄 sanitizer_getauxval.h(1.73 KB)
📄 sanitizer_glibc_version.h(748 B)
📄 sanitizer_hash.h(1.04 KB)
📄 sanitizer_interceptors_ioctl_netbsd.inc(68.81 KB)
📄 sanitizer_interface_internal.h(5.28 KB)
📄 sanitizer_internal_defs.h(14.28 KB)
📄 sanitizer_lfstack.h(2.08 KB)
📄 sanitizer_libc.cpp(7.21 KB)
📄 sanitizer_libc.h(3.23 KB)
📄 sanitizer_libignore.cpp(4.24 KB)
📄 sanitizer_libignore.h(3.5 KB)
📄 sanitizer_linux.cpp(71.58 KB)
📄 sanitizer_linux.h(5.47 KB)
📄 sanitizer_linux_libcdep.cpp(25.67 KB)
📄 sanitizer_linux_s390.cpp(6.91 KB)
📄 sanitizer_list.h(3.81 KB)
📄 sanitizer_local_address_space_view.h(3.67 KB)
📄 sanitizer_mac.cpp(38.67 KB)
📄 sanitizer_mac.h(2.49 KB)
📄 sanitizer_mac_libcdep.cpp(968 B)
📄 sanitizer_malloc_mac.inc(13.06 KB)
📄 sanitizer_mutex.h(5.17 KB)
📄 sanitizer_netbsd.cpp(9.95 KB)
📄 sanitizer_openbsd.cpp(3.17 KB)
📄 sanitizer_persistent_allocator.cpp(687 B)
📄 sanitizer_persistent_allocator.h(2.31 KB)
📄 sanitizer_placement_new.h(885 B)
📄 sanitizer_platform.h(10.11 KB)
📄 sanitizer_platform_interceptors.h(24.93 KB)
📄 sanitizer_platform_limits_freebsd.cpp(19.79 KB)
📄 sanitizer_platform_limits_freebsd.h(18.41 KB)
📄 sanitizer_platform_limits_linux.cpp(3.32 KB)
📄 sanitizer_platform_limits_netbsd.cpp(109.73 KB)
📄 sanitizer_platform_limits_netbsd.h(81.54 KB)
📄 sanitizer_platform_limits_openbsd.cpp(8.69 KB)
📄 sanitizer_platform_limits_openbsd.h(8.68 KB)
📄 sanitizer_platform_limits_posix.cpp(48.89 KB)
📄 sanitizer_platform_limits_posix.h(40.65 KB)
📄 sanitizer_platform_limits_solaris.cpp(11.93 KB)
📄 sanitizer_platform_limits_solaris.h(12.26 KB)
📄 sanitizer_posix.cpp(11.93 KB)
📄 sanitizer_posix.h(5.14 KB)
📄 sanitizer_posix_libcdep.cpp(16.21 KB)
📄 sanitizer_printf.cpp(12.07 KB)
📄 sanitizer_procmaps.h(2.93 KB)
📄 sanitizer_procmaps_bsd.cpp(3.81 KB)
📄 sanitizer_procmaps_common.cpp(5.27 KB)
📄 sanitizer_procmaps_fuchsia.cpp(2.51 KB)
📄 sanitizer_procmaps_linux.cpp(2.9 KB)
📄 sanitizer_procmaps_mac.cpp(13.7 KB)
📄 sanitizer_procmaps_solaris.cpp(2.18 KB)
📄 sanitizer_ptrauth.h(720 B)
📄 sanitizer_quarantine.h(9.57 KB)
📄 sanitizer_report_decorator.h(1.89 KB)
📄 sanitizer_ring_buffer.h(4.7 KB)
📄 sanitizer_rtems.cpp(7.61 KB)
📄 sanitizer_rtems.h(772 B)
📄 sanitizer_signal_interceptors.inc(2.89 KB)
📄 sanitizer_solaris.cpp(6.6 KB)
📄 sanitizer_stackdepot.cpp(4.54 KB)
📄 sanitizer_stackdepot.h(2.13 KB)
📄 sanitizer_stackdepotbase.h(5.58 KB)
📄 sanitizer_stacktrace.cpp(4.58 KB)
📄 sanitizer_stacktrace.h(5.65 KB)
📄 sanitizer_stacktrace_libcdep.cpp(5.54 KB)
📄 sanitizer_stacktrace_printer.cpp(9.08 KB)
📄 sanitizer_stacktrace_printer.h(3.08 KB)
📄 sanitizer_stacktrace_sparc.cpp(3.05 KB)
📄 sanitizer_stoptheworld.h(2.34 KB)
📄 sanitizer_stoptheworld_fuchsia.cpp(1.28 KB)
📄 sanitizer_stoptheworld_linux_libcdep.cpp(20.8 KB)
📄 sanitizer_stoptheworld_mac.cpp(5.29 KB)
📄 sanitizer_stoptheworld_netbsd_libcdep.cpp(11.02 KB)
📄 sanitizer_suppressions.cpp(5.67 KB)
📄 sanitizer_suppressions.h(1.69 KB)
📄 sanitizer_symbolizer.cpp(3.65 KB)
📄 sanitizer_symbolizer.h(6.62 KB)
📄 sanitizer_symbolizer_fuchsia.h(1.56 KB)
📄 sanitizer_symbolizer_internal.h(5.8 KB)
📄 sanitizer_symbolizer_libbacktrace.cpp(6.1 KB)
📄 sanitizer_symbolizer_libbacktrace.h(1.49 KB)
📄 sanitizer_symbolizer_libcdep.cpp(17.45 KB)
📄 sanitizer_symbolizer_mac.cpp(8.48 KB)
📄 sanitizer_symbolizer_mac.h(1.37 KB)
📄 sanitizer_symbolizer_markup.cpp(5.39 KB)
📄 sanitizer_symbolizer_posix_libcdep.cpp(16.5 KB)
📄 sanitizer_symbolizer_report.cpp(10.01 KB)
📄 sanitizer_symbolizer_rtems.h(1.56 KB)
📄 sanitizer_symbolizer_win.cpp(11.59 KB)
📄 sanitizer_syscall_generic.inc(1.06 KB)
📄 sanitizer_syscall_linux_aarch64.inc(4.58 KB)
📄 sanitizer_syscall_linux_arm.inc(4.58 KB)
📄 sanitizer_syscall_linux_x86_64.inc(3.07 KB)
📄 sanitizer_syscalls_netbsd.inc(120.97 KB)
📄 sanitizer_termination.cpp(2.86 KB)
📄 sanitizer_thread_registry.cpp(10.31 KB)
📄 sanitizer_thread_registry.h(5.44 KB)
📄 sanitizer_tls_get_addr.cpp(5.29 KB)
📄 sanitizer_tls_get_addr.h(2.21 KB)
📄 sanitizer_type_traits.cpp(708 B)
📄 sanitizer_type_traits.h(1.49 KB)
📄 sanitizer_unwind_linux_libcdep.cpp(6.13 KB)
📄 sanitizer_unwind_win.cpp(2.41 KB)
📄 sanitizer_vector.h(2.57 KB)
📄 sanitizer_win.cpp(33.3 KB)
📄 sanitizer_win.h(851 B)
📄 sanitizer_win_defs.h(7.23 KB)
📄 sanitizer_win_dll_thunk.cpp(3.41 KB)
📄 sanitizer_win_dll_thunk.h(11.13 KB)
📄 sanitizer_win_dynamic_runtime_thunk.cpp(1.16 KB)
📄 sanitizer_win_weak_interception.cpp(3.49 KB)
📄 sanitizer_win_weak_interception.h(1.64 KB)
📁 symbolizer
📄 weak_symbols.txt(230 B)

Editing: sanitizer_posix.cpp

//===-- sanitizer_posix.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries and implements POSIX-specific functions from
// sanitizer_posix.h.
//===----------------------------------------------------------------------===//

#include "sanitizer_platform.h"

#if SANITIZER_POSIX

#include "sanitizer_common.h"
#include "sanitizer_file.h"
#include "sanitizer_flags.h"
#include "sanitizer_libc.h"
#include "sanitizer_posix.h"
#include "sanitizer_procmaps.h"

#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/mman.h>

#if SANITIZER_FREEBSD
// The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
// that, it was never implemented.  So just define it to zero.
#undef  MAP_NORESERVE
#define MAP_NORESERVE 0
#endif

namespace __sanitizer {

// ------------- sanitizer_common.h
uptr GetMmapGranularity() {
  return GetPageSize();
}

void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
  size = RoundUpTo(size, GetPageSizeCached());
  uptr res = MmapNamed(nullptr, size, PROT_READ | PROT_WRITE,
                       MAP_PRIVATE | MAP_ANON, mem_type);
  int reserrno;
  if (UNLIKELY(internal_iserror(res, &reserrno)))
    ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno, raw_report);
  IncreaseTotalMmap(size);
  return (void *)res;
}

void UnmapOrDie(void *addr, uptr size) {
  if (!addr || !size) return;
  uptr res = internal_munmap(addr, size);
  if (UNLIKELY(internal_iserror(res))) {
    Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
           SanitizerToolName, size, size, addr);
    CHECK("unable to unmap" && 0);
  }
  DecreaseTotalMmap(size);
}

void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
  size = RoundUpTo(size, GetPageSizeCached());
  uptr res = MmapNamed(nullptr, size, PROT_READ | PROT_WRITE,
                       MAP_PRIVATE | MAP_ANON, mem_type);
  int reserrno;
  if (UNLIKELY(internal_iserror(res, &reserrno))) {
    if (reserrno == ENOMEM)
      return nullptr;
    ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno);
  }
  IncreaseTotalMmap(size);
  return (void *)res;
}

// We want to map a chunk of address space aligned to 'alignment'.
// We do it by mapping a bit more and then unmapping redundant pieces.
// We probably can do it with fewer syscalls in some OS-dependent way.
void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
                                   const char *mem_type) {
  CHECK(IsPowerOfTwo(size));
  CHECK(IsPowerOfTwo(alignment));
  uptr map_size = size + alignment;
  uptr map_res = (uptr)MmapOrDieOnFatalError(map_size, mem_type);
  if (UNLIKELY(!map_res))
    return nullptr;
  uptr map_end = map_res + map_size;
  uptr res = map_res;
  if (!IsAligned(res, alignment)) {
    res = (map_res + alignment - 1) & ~(alignment - 1);
    UnmapOrDie((void*)map_res, res - map_res);
  }
  uptr end = res + size;
  if (end != map_end)
    UnmapOrDie((void*)end, map_end - end);
  return (void*)res;
}

void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
  size = RoundUpTo(size, GetPageSizeCached());
  uptr p = MmapNamed(nullptr, size, PROT_READ | PROT_WRITE,
                     MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, mem_type);
  int reserrno;
  if (UNLIKELY(internal_iserror(p, &reserrno)))
    ReportMmapFailureAndDie(size, mem_type, "allocate noreserve", reserrno);
  IncreaseTotalMmap(size);
  return (void *)p;
}

static void *MmapFixedImpl(uptr fixed_addr, uptr size, bool tolerate_enomem,
                           const char *name) {
  size = RoundUpTo(size, GetPageSizeCached());
  fixed_addr = RoundDownTo(fixed_addr, GetPageSizeCached());
  uptr p = MmapNamed((void *)fixed_addr, size, PROT_READ | PROT_WRITE,
                     MAP_PRIVATE | MAP_ANON | MAP_FIXED, name);
  int reserrno;
  if (UNLIKELY(internal_iserror(p, &reserrno))) {
    if (tolerate_enomem && reserrno == ENOMEM)
      return nullptr;
    char mem_type[40];
    internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
                      fixed_addr);
    ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno);
  }
  IncreaseTotalMmap(size);
  return (void *)p;
}

void *MmapFixedOrDie(uptr fixed_addr, uptr size, const char *name) {
  return MmapFixedImpl(fixed_addr, size, false /*tolerate_enomem*/, name);
}

void *MmapFixedOrDieOnFatalError(uptr fixed_addr, uptr size, const char *name) {
  return MmapFixedImpl(fixed_addr, size, true /*tolerate_enomem*/, name);
}

bool MprotectNoAccess(uptr addr, uptr size) {
  return 0 == internal_mprotect((void*)addr, size, PROT_NONE);
}

bool MprotectReadOnly(uptr addr, uptr size) {
  return 0 == internal_mprotect((void *)addr, size, PROT_READ);
}

#if !SANITIZER_MAC
void MprotectMallocZones(void *addr, int prot) {}
#endif

fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *errno_p) {
  if (ShouldMockFailureToOpen(filename))
    return kInvalidFd;
  int flags;
  switch (mode) {
    case RdOnly: flags = O_RDONLY; break;
    case WrOnly: flags = O_WRONLY | O_CREAT | O_TRUNC; break;
    case RdWr: flags = O_RDWR | O_CREAT; break;
  }
  fd_t res = internal_open(filename, flags, 0660);
  if (internal_iserror(res, errno_p))
    return kInvalidFd;
  return ReserveStandardFds(res);
}

void CloseFile(fd_t fd) {
  internal_close(fd);
}

bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, uptr *bytes_read,
                  error_t *error_p) {
  uptr res = internal_read(fd, buff, buff_size);
  if (internal_iserror(res, error_p))
    return false;
  if (bytes_read)
    *bytes_read = res;
  return true;
}

bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, uptr *bytes_written,
                 error_t *error_p) {
  uptr res = internal_write(fd, buff, buff_size);
  if (internal_iserror(res, error_p))
    return false;
  if (bytes_written)
    *bytes_written = res;
  return true;
}

void *MapFileToMemory(const char *file_name, uptr *buff_size) {
  fd_t fd = OpenFile(file_name, RdOnly);
  CHECK(fd != kInvalidFd);
  uptr fsize = internal_filesize(fd);
  CHECK_NE(fsize, (uptr)-1);
  CHECK_GT(fsize, 0);
  *buff_size = RoundUpTo(fsize, GetPageSizeCached());
  uptr map = internal_mmap(nullptr, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
  return internal_iserror(map) ? nullptr : (void *)map;
}

void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
  uptr flags = MAP_SHARED;
  if (addr) flags |= MAP_FIXED;
  uptr p = internal_mmap(addr, size, PROT_READ | PROT_WRITE, flags, fd, offset);
  int mmap_errno = 0;
  if (internal_iserror(p, &mmap_errno)) {
    Printf("could not map writable file (%d, %lld, %zu): %zd, errno: %d\n",
           fd, (long long)offset, size, p, mmap_errno);
    return nullptr;
  }
  return (void *)p;
}

static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
                                        uptr start2, uptr end2) {
  CHECK(start1 <= end1);
  CHECK(start2 <= end2);
  return (end1 < start2) || (end2 < start1);
}

// FIXME: this is thread-unsafe, but should not cause problems most of the time.
// When the shadow is mapped only a single thread usually exists (plus maybe
// several worker threads on Mac, which aren't expected to map big chunks of
// memory).
bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
  MemoryMappingLayout proc_maps(/*cache_enabled*/true);
  if (proc_maps.Error())
    return true; // and hope for the best
  MemoryMappedSegment segment;
  while (proc_maps.Next(&segment)) {
    if (segment.start == segment.end) continue;  // Empty range.
    CHECK_NE(0, segment.end);
    if (!IntervalsAreSeparate(segment.start, segment.end - 1, range_start,
                              range_end))
      return false;
  }
  return true;
}

void DumpProcessMap() {
  MemoryMappingLayout proc_maps(/*cache_enabled*/true);
  const sptr kBufSize = 4095;
  char *filename = (char*)MmapOrDie(kBufSize, __func__);
  MemoryMappedSegment segment(filename, kBufSize);
  Report("Process memory map follows:\n");
  while (proc_maps.Next(&segment)) {
    Printf("\t%p-%p\t%s\n", (void *)segment.start, (void *)segment.end,
           segment.filename);
  }
  Report("End of process memory map.\n");
  UnmapOrDie(filename, kBufSize);
}

const char *GetPwd() {
  return GetEnv("PWD");
}

bool IsPathSeparator(const char c) {
  return c == '/';
}

bool IsAbsolutePath(const char *path) {
  return path != nullptr && IsPathSeparator(path[0]);
}

void ReportFile::Write(const char *buffer, uptr length) {
  SpinMutexLock l(mu);
  ReopenIfNecessary();
  internal_write(fd, buffer, length);
}

bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end) {
  MemoryMappingLayout proc_maps(/*cache_enabled*/false);
  InternalScopedString buff(kMaxPathLength);
  MemoryMappedSegment segment(buff.data(), kMaxPathLength);
  while (proc_maps.Next(&segment)) {
    if (segment.IsExecutable() &&
        internal_strcmp(module, segment.filename) == 0) {
      *start = segment.start;
      *end = segment.end;
      return true;
    }
  }
  return false;
}

uptr SignalContext::GetAddress() const {
  auto si = static_cast<const siginfo_t *>(siginfo);
  return (uptr)si->si_addr;
}

bool SignalContext::IsMemoryAccess() const {
  auto si = static_cast<const siginfo_t *>(siginfo);
  return si->si_signo == SIGSEGV;
}

int SignalContext::GetType() const {
  return static_cast<const siginfo_t *>(siginfo)->si_signo;
}

const char *SignalContext::Describe() const {
  switch (GetType()) {
    case SIGFPE:
      return "FPE";
    case SIGILL:
      return "ILL";
    case SIGABRT:
      return "ABRT";
    case SIGSEGV:
      return "SEGV";
    case SIGBUS:
      return "BUS";
    case SIGTRAP:
      return "TRAP";
  }
  return "UNKNOWN SIGNAL";
}

fd_t ReserveStandardFds(fd_t fd) {
  CHECK_GE(fd, 0);
  if (fd > 2)
    return fd;
  bool used[3];
  internal_memset(used, 0, sizeof(used));
  while (fd <= 2) {
    used[fd] = true;
    fd = internal_dup(fd);
  }
  for (int i = 0; i <= 2; ++i)
    if (used[i])
      internal_close(i);
  return fd;
}

bool ShouldMockFailureToOpen(const char *path) {
  return common_flags()->test_only_emulate_no_memorymap &&
         internal_strncmp(path, "/proc/", 6) == 0;
}

#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_GO
int GetNamedMappingFd(const char *name, uptr size, int *flags) {
  if (!common_flags()->decorate_proc_maps || !name)
    return -1;
  char shmname[200];
  CHECK(internal_strlen(name) < sizeof(shmname) - 10);
  internal_snprintf(shmname, sizeof(shmname), "/dev/shm/%zu [%s]",
                    internal_getpid(), name);
  int o_cloexec = 0;
#if defined(O_CLOEXEC)
  o_cloexec = O_CLOEXEC;
#endif
  int fd = ReserveStandardFds(
      internal_open(shmname, O_RDWR | O_CREAT | O_TRUNC | o_cloexec, S_IRWXU));
  CHECK_GE(fd, 0);
  if (!o_cloexec) {
    int res = fcntl(fd, F_SETFD, FD_CLOEXEC);
    CHECK_EQ(0, res);
  }
  int res = internal_ftruncate(fd, size);
  CHECK_EQ(0, res);
  res = internal_unlink(shmname);
  CHECK_EQ(0, res);
  *flags &= ~(MAP_ANON | MAP_ANONYMOUS);
  return fd;
}
#else
int GetNamedMappingFd(const char *name, uptr size, int *flags) {
  return -1;
}
#endif

#if SANITIZER_ANDROID
#define PR_SET_VMA 0x53564d41
#define PR_SET_VMA_ANON_NAME 0
void DecorateMapping(uptr addr, uptr size, const char *name) {
  if (!common_flags()->decorate_proc_maps || !name)
    return;
  internal_prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, addr, size, (uptr)name);
}
#else
void DecorateMapping(uptr addr, uptr size, const char *name) {
}
#endif

uptr MmapNamed(void *addr, uptr length, int prot, int flags, const char *name) {
  int fd = GetNamedMappingFd(name, length, &flags);
  uptr res = internal_mmap(addr, length, prot, flags, fd, 0);
  if (!internal_iserror(res))
    DecorateMapping(res, length, name);
  return res;
}

} // namespace __sanitizer

#endif // SANITIZER_POSIX

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