base/process/process_metrics_posix.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/process/process_metrics.h"
   6
   7 #include <sys/resource.h>
   8 #include <sys/time.h>
   9
  10 #include "base/logging.h"
  11
  12 namespace base {
  13
  14 int64 TimeValToMicroseconds(const struct timeval& tv) {
  15   int64 ret = tv.tv_sec;  // Avoid (int * int) integer overflow.
  16   ret *= Time::kMicrosecondsPerSecond;
  17   ret += tv.tv_usec;
  18   return ret;
  19 }
  20
  21 ProcessMetrics::~ProcessMetrics() { }
  22
  23 #if defined(OS_LINUX)
  24 static const rlim_t kSystemDefaultMaxFds = 8192;
  25 #elif defined(OS_MACOSX)
  26 static const rlim_t kSystemDefaultMaxFds = 256;
  27 #elif defined(OS_SOLARIS)
  28 static const rlim_t kSystemDefaultMaxFds = 8192;
  29 #elif defined(OS_FREEBSD)
  30 static const rlim_t kSystemDefaultMaxFds = 8192;
  31 #elif defined(OS_OPENBSD)
  32 static const rlim_t kSystemDefaultMaxFds = 256;
  33 #elif defined(OS_ANDROID)
  34 static const rlim_t kSystemDefaultMaxFds = 1024;
  35 #endif
  36
  37 size_t GetMaxFds() {
  38   rlim_t max_fds;
  39   struct rlimit nofile;
  40   if (getrlimit(RLIMIT_NOFILE, &nofile)) {
  41     // getrlimit failed. Take a best guess.
  42     max_fds = kSystemDefaultMaxFds;
  43     RAW_LOG(ERROR, "getrlimit(RLIMIT_NOFILE) failed");
  44   } else {
  45     max_fds = nofile.rlim_cur;
  46   }
  47
  48   if (max_fds > INT_MAX)
  49     max_fds = INT_MAX;
  50
  51   return static_cast<size_t>(max_fds);
  52 }
  53
  54
  55 void SetFdLimit(unsigned int max_descriptors) {
  56   struct rlimit limits;
  57   if (getrlimit(RLIMIT_NOFILE, &limits) == 0) {
  58     unsigned int new_limit = max_descriptors;
  59     if (limits.rlim_max > 0 && limits.rlim_max < max_descriptors) {
  60       new_limit = limits.rlim_max;
  61     }
  62     limits.rlim_cur = new_limit;
  63     if (setrlimit(RLIMIT_NOFILE, &limits) != 0) {
  64       PLOG(INFO) << "Failed to set file descriptor limit";
  65     }
  66   } else {
  67     PLOG(INFO) << "Failed to get file descriptor limit";
  68   }
  69 }
  70
  71 size_t GetPageSize() {
  72   return getpagesize();
  73 }
  74
  75 }  // namespace base