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

base/process_util.h

Index: base/process_util.h
diff --git a/base/process_util.h b/base/process_util.h
index 5146c120fa4fb34c15c6e148d38791ee2abcaa13..c88d341cdc0a1acfa6c14eeaee86f61c4e5f9e04 100644
--- a/base/process_util.h
+++ b/base/process_util.h
@@ -66,6 +66,12 @@ ProcessHandle GetCurrentProcessHandle();
 // Win XP SP1 as well.
 int GetProcId(ProcessHandle process);
 
+#if defined(OS_POSIX)
+// Returns the maximum number of files that a process can have open.
+// Returns 0 on error.
+int GetMaxFilesOpenInProcess();
+#endif
+
 #if defined(OS_WIN)
 // Runs the given application name with the given command line. Normally, the
 // first command line argument should be the path to the process, and don't
@@ -87,13 +93,18 @@ bool LaunchApp(const std::wstring& cmdline,
 // Runs the application specified in argv[0] with the command line argv.
 // Both the elements of argv and argv itself must be terminated with a null
 // byte.
+// Before launching all FDs open in the parent process will be marked as
+// close-on-exec.  |fds_to_remap| defines a mapping of src fd->dest fd to
+// propagate FDs into the child process.
 //
 // As above, if wait is true, execute synchronously. The pid will be stored
 // in process_handle if that pointer is non-null.
 //
 // Note that the first argument in argv must point to the filename,
 // and must be fully specified.
+typedef std::vector<std::pair<int, int> > file_handle_mapping_vector;
 bool LaunchApp(const std::vector<std::string>& argv,
+               const file_handle_mapping_vector& fds_to_remap,
                bool wait, ProcessHandle* process_handle);
 #endif