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 <limits.h> 8 #include <stddef.h> 9 #include <stdint.h> 10 #include <sys/resource.h> 11 #include <sys/time.h> 12 #include <unistd.h> 13 14 #include "base/logging.h" 15 #include "build/build_config.h" 16 17 namespace base { 18 19 int64_t TimeValToMicroseconds(const struct timeval& tv) { 20 int64_t ret = tv.tv_sec; // Avoid (int * int) integer overflow. 21 ret *= Time::kMicrosecondsPerSecond; 22 ret += tv.tv_usec; 23 return ret; 24 } 25 26 ProcessMetrics::~ProcessMetrics() { } 27 28 #if defined(OS_LINUX) 29 static const rlim_t kSystemDefaultMaxFds = 8192; 30 #elif defined(OS_MACOSX) 31 static const rlim_t kSystemDefaultMaxFds = 256; 32 #elif defined(OS_SOLARIS) 33 static const rlim_t kSystemDefaultMaxFds = 8192; 34 #elif defined(OS_FREEBSD) 35 static const rlim_t kSystemDefaultMaxFds = 8192; 36 #elif defined(OS_OPENBSD) 37 static const rlim_t kSystemDefaultMaxFds = 256; 38 #elif defined(OS_ANDROID) 39 static const rlim_t kSystemDefaultMaxFds = 1024; 40 #endif 41 42 size_t GetMaxFds() { 43 rlim_t max_fds; 44 struct rlimit nofile; 45 if (getrlimit(RLIMIT_NOFILE, &nofile)) { 46 // getrlimit failed. Take a best guess. 47 max_fds = kSystemDefaultMaxFds; 48 RAW_LOG(ERROR, "getrlimit(RLIMIT_NOFILE) failed"); 49 } else { 50 max_fds = nofile.rlim_cur; 51 } 52 53 if (max_fds > INT_MAX) 54 max_fds = INT_MAX; 55 56 return static_cast<size_t>(max_fds); 57 } 58 59 60 void SetFdLimit(unsigned int max_descriptors) { 61 struct rlimit limits; 62 if (getrlimit(RLIMIT_NOFILE, &limits) == 0) { 63 unsigned int new_limit = max_descriptors; 64 if (limits.rlim_max > 0 && limits.rlim_max < max_descriptors) { 65 new_limit = limits.rlim_max; 66 } 67 limits.rlim_cur = new_limit; 68 if (setrlimit(RLIMIT_NOFILE, &limits) != 0) { 69 PLOG(INFO) << "Failed to set file descriptor limit"; 70 } 71 } else { 72 PLOG(INFO) << "Failed to get file descriptor limit"; 73 } 74 } 75 76 size_t GetPageSize() { 77 return getpagesize(); 78 } 79 80 } // namespace base 81
