Split ProcessHandle and its related routines into base/process/process_handle.h.

base/process/process_metrics_posix.cc

Index: base/process/process_metrics_posix.cc
diff --git a/base/process/process_metrics_posix.cc b/base/process/process_metrics_posix.cc
index 3422a730dce691847b886de4f092c1720ede0c2f..531f6a40d701444ea77c290130221ad502642198 100644
--- a/base/process/process_metrics_posix.cc
+++ b/base/process/process_metrics_posix.cc
@@ -4,8 +4,11 @@
 
 #include "base/process/process_metrics.h"
 
+#include <sys/resource.h>
 #include <sys/time.h>
 
+#include "base/logging.h"
+
 namespace base {
 
 int64 TimeValToMicroseconds(const struct timeval& tv) {
@@ -18,4 +21,35 @@ int64 TimeValToMicroseconds(const struct timeval& tv) {
 
 ProcessMetrics::~ProcessMetrics() { }
 
+#if defined(OS_LINUX)
+static const rlim_t kSystemDefaultMaxFds = 8192;
+#elif defined(OS_MACOSX)
+static const rlim_t kSystemDefaultMaxFds = 256;
+#elif defined(OS_SOLARIS)
+static const rlim_t kSystemDefaultMaxFds = 8192;
+#elif defined(OS_FREEBSD)
+static const rlim_t kSystemDefaultMaxFds = 8192;
+#elif defined(OS_OPENBSD)
+static const rlim_t kSystemDefaultMaxFds = 256;
+#elif defined(OS_ANDROID)
+static const rlim_t kSystemDefaultMaxFds = 1024;
+#endif
+
+size_t GetMaxFds() {
+  rlim_t max_fds;
+  struct rlimit nofile;
+  if (getrlimit(RLIMIT_NOFILE, &nofile)) {
+    // getrlimit failed. Take a best guess.
+    max_fds = kSystemDefaultMaxFds;
+    RAW_LOG(ERROR, "getrlimit(RLIMIT_NOFILE) failed");
+  } else {
+    max_fds = nofile.rlim_cur;
+  }
+
+  if (max_fds > INT_MAX)
+    max_fds = INT_MAX;
+
+  return static_cast<size_t>(max_fds);
+}
+
 }  // namespace base