POSIX: don't leak FDs when launching child Processes.

base/process_util_posix.cc

 // Copyright (c) 2006-2008 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/process_util.h"
 
 #include <sys/resource.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
+#include <limits>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/sys_info.h"
 #include "base/time.h"
 
 const int kMicrosecondsPerSecond = 1000000;
 
 namespace base {
 
 int GetCurrentProcId() {
   return getpid();
 }
 
 ProcessHandle GetCurrentProcessHandle() {
   return GetCurrentProcId();
 }
 
 int GetProcId(ProcessHandle process) {
   return process;
 }
 
+int GetMaxFilesOpenInProcess() {
+  struct rlimit rlimit;
+  if (getrlimit(RLIMIT_NOFILE, &rlimit) != 0) {
+    return 0;
+  }
+
+  // rlim_t is a uint64 - clip to maxint.
+  // We do this since we use the value of this function to close FD #s in a loop
+  // if we didn't clamp the value, doing this would be too time consuming.
+  rlim_t max_int = static_cast<rlim_t>(std::numeric_limits<int32>::max());
+  if (rlimit.rlim_cur > max_int) {
+    return max_int;
+  }
+
+  return rlimit.rlim_cur;
+}
+
 ProcessMetrics::ProcessMetrics(ProcessHandle process) : process_(process),
                                                         last_time_(0),
                                                         last_system_time_(0) {
   processor_count_ = base::SysInfo::NumberOfProcessors();
 }
 
 // static
 ProcessMetrics* ProcessMetrics::CreateProcessMetrics(ProcessHandle process) {
   return new ProcessMetrics(process);
 }
@@ skipping 103 matching lines @@
   int cpu = static_cast<int>((system_time_delta * 100 + time_delta / 2) /
                              time_delta);
 
   last_system_time_ = system_time;
   last_time_ = time;
 
   return cpu;
 }
 
 }  // namespace base