Move base to DEPS

base/debug/proc_maps_linux.cc

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/debug/proc_maps_linux.h"
-
-#include <fcntl.h>
-
-#if defined(OS_LINUX) || defined(OS_ANDROID)
-#include <inttypes.h>
-#endif
-
-#include "base/files/file_util.h"
-#include "base/files/scoped_file.h"
-#include "base/strings/string_split.h"
-
-#if defined(OS_ANDROID) && !defined(__LP64__)
-// In 32-bit mode, Bionic's inttypes.h defines PRI/SCNxPTR as an
-// unsigned long int, which is incompatible with Bionic's stdint.h
-// defining uintptr_t as an unsigned int:
-// https://code.google.com/p/android/issues/detail?id=57218
-#undef SCNxPTR
-#define SCNxPTR "x"
-#endif
-
-namespace base {
-namespace debug {
-
-// Scans |proc_maps| starting from |pos| returning true if the gate VMA was
-// found, otherwise returns false.
-static bool ContainsGateVMA(std::string* proc_maps, size_t pos) {
-#if defined(ARCH_CPU_ARM_FAMILY)
-  // The gate VMA on ARM kernels is the interrupt vectors page.
-  return proc_maps->find(" [vectors]\n", pos) != std::string::npos;
-#elif defined(ARCH_CPU_X86_64)
-  // The gate VMA on x86 64-bit kernels is the virtual system call page.
-  return proc_maps->find(" [vsyscall]\n", pos) != std::string::npos;
-#else
-  // Otherwise assume there is no gate VMA in which case we shouldn't
-  // get duplicate entires.
-  return false;
-#endif
-}
-
-bool ReadProcMaps(std::string* proc_maps) {
-  // seq_file only writes out a page-sized amount on each call. Refer to header
-  // file for details.
-  const long kReadSize = sysconf(_SC_PAGESIZE);
-
-  base::ScopedFD fd(HANDLE_EINTR(open("/proc/self/maps", O_RDONLY)));
-  if (!fd.is_valid()) {
-    DPLOG(ERROR) << "Couldn't open /proc/self/maps";
-    return false;
-  }
-  proc_maps->clear();
-
-  while (true) {
-    // To avoid a copy, resize |proc_maps| so read() can write directly into it.
-    // Compute |buffer| afterwards since resize() may reallocate.
-    size_t pos = proc_maps->size();
-    proc_maps->resize(pos + kReadSize);
-    void* buffer = &(*proc_maps)[pos];
-
-    ssize_t bytes_read = HANDLE_EINTR(read(fd.get(), buffer, kReadSize));
-    if (bytes_read < 0) {
-      DPLOG(ERROR) << "Couldn't read /proc/self/maps";
-      proc_maps->clear();
-      return false;
-    }
-
-    // ... and don't forget to trim off excess bytes.
-    proc_maps->resize(pos + bytes_read);
-
-    if (bytes_read == 0)
-      break;
-
-    // The gate VMA is handled as a special case after seq_file has finished
-    // iterating through all entries in the virtual memory table.
-    //
-    // Unfortunately, if additional entries are added at this point in time
-    // seq_file gets confused and the next call to read() will return duplicate
-    // entries including the gate VMA again.
-    //
-    // Avoid this by searching for the gate VMA and breaking early.
-    if (ContainsGateVMA(proc_maps, pos))
-      break;
-  }
-
-  return true;
-}
-
-bool ParseProcMaps(const std::string& input,
-                   std::vector<MappedMemoryRegion>* regions_out) {
-  CHECK(regions_out);
-  std::vector<MappedMemoryRegion> regions;
-
-  // This isn't async safe nor terribly efficient, but it doesn't need to be at
-  // this point in time.
-  std::vector<std::string> lines;
-  SplitString(input, '\n', &lines);
-
-  for (size_t i = 0; i < lines.size(); ++i) {
-    // Due to splitting on '\n' the last line should be empty.
-    if (i == lines.size() - 1) {
-      if (!lines[i].empty()) {
-        DLOG(WARNING) << "Last line not empty";
-        return false;
-      }
-      break;
-    }
-
-    MappedMemoryRegion region;
-    const char* line = lines[i].c_str();
-    char permissions[5] = {'\0'};  // Ensure NUL-terminated string.
-    uint8 dev_major = 0;
-    uint8 dev_minor = 0;
-    long inode = 0;
-    int path_index = 0;
-
-    // Sample format from man 5 proc:
-    //
-    // address           perms offset  dev   inode   pathname
-    // 08048000-08056000 r-xp 00000000 03:0c 64593   /usr/sbin/gpm
-    //
-    // The final %n term captures the offset in the input string, which is used
-    // to determine the path name. It *does not* increment the return value.
-    // Refer to man 3 sscanf for details.
-    if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4c %llx %hhx:%hhx %ld %n",
-               &region.start, &region.end, permissions, &region.offset,
-               &dev_major, &dev_minor, &inode, &path_index) < 7) {
-      DPLOG(WARNING) << "sscanf failed for line: " << line;
-      return false;
-    }
-
-    region.permissions = 0;
-
-    if (permissions[0] == 'r')
-      region.permissions |= MappedMemoryRegion::READ;
-    else if (permissions[0] != '-')
-      return false;
-
-    if (permissions[1] == 'w')
-      region.permissions |= MappedMemoryRegion::WRITE;
-    else if (permissions[1] != '-')
-      return false;
-
-    if (permissions[2] == 'x')
-      region.permissions |= MappedMemoryRegion::EXECUTE;
-    else if (permissions[2] != '-')
-      return false;
-
-    if (permissions[3] == 'p')
-      region.permissions |= MappedMemoryRegion::PRIVATE;
-    else if (permissions[3] != 's' && permissions[3] != 'S')  // Shared memory.
-      return false;
-
-    // Pushing then assigning saves us a string copy.
-    regions.push_back(region);
-    regions.back().path.assign(line + path_index);
-  }
-
-  regions_out->swap(regions);
-  return true;
-}
-
-}  // namespace debug
-}  // namespace base