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   static const int kMicrosecondsPerSecond = 1000000;
  16   int64 ret = tv.tv_sec;  // Avoid (int * int) integer overflow.
  17   ret *= kMicrosecondsPerSecond;
  18   ret += tv.tv_usec;
  19   return ret;
  20 }
  21
  22 ProcessMetrics::~ProcessMetrics() { }
  23
  24 #if defined(OS_LINUX)
  25 static const rlim_t kSystemDefaultMaxFds = 8192;
  26 #elif defined(OS_MACOSX)
  27 static const rlim_t kSystemDefaultMaxFds = 256;
  28 #elif defined(OS_SOLARIS)
  29 static const rlim_t kSystemDefaultMaxFds = 8192;
  30 #elif defined(OS_FREEBSD)
  31 static const rlim_t kSystemDefaultMaxFds = 8192;
  32 #elif defined(OS_OPENBSD)
  33 static const rlim_t kSystemDefaultMaxFds = 256;
  34 #elif defined(OS_ANDROID)
  35 static const rlim_t kSystemDefaultMaxFds = 1024;
  36 #endif
  37
  38 size_t GetMaxFds() {
  39   rlim_t max_fds;
  40   struct rlimit nofile;
  41   if (getrlimit(RLIMIT_NOFILE, &nofile)) {
  42     // getrlimit failed. Take a best guess.
  43     max_fds = kSystemDefaultMaxFds;
  44     RAW_LOG(ERROR, "getrlimit(RLIMIT_NOFILE) failed");
  45   } else {
  46     max_fds = nofile.rlim_cur;
  47   }
  48
  49   if (max_fds > INT_MAX)
  50     max_fds = INT_MAX;
  51
  52   return static_cast<size_t>(max_fds);
  53 }
  54
  55
  56 void SetFdLimit(unsigned int max_descriptors) {
  57   struct rlimit limits;
  58   if (getrlimit(RLIMIT_NOFILE, &limits) == 0) {
  59     unsigned int new_limit = max_descriptors;
  60     if (limits.rlim_max > 0 && limits.rlim_max < max_descriptors) {
  61       new_limit = limits.rlim_max;
  62     }
  63     limits.rlim_cur = new_limit;
  64     if (setrlimit(RLIMIT_NOFILE, &limits) != 0) {
  65       PLOG(INFO) << "Failed to set file descriptor limit";
  66     }
  67   } else {
  68     PLOG(INFO) << "Failed to get file descriptor limit";
  69   }
  70 }
  71
  72 }  // namespace base