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

base/process_util.h

 // 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.
 
 // This file/namespace contains utility functions for enumerating, ending and
 // computing statistics of processes.
 
 #ifndef BASE_PROCESS_UTIL_H_
 #define BASE_PROCESS_UTIL_H_
 
@@ skipping 48 matching lines @@
 int GetCurrentProcId();
 
 // Returns the ProcessHandle of the current process.
 ProcessHandle GetCurrentProcessHandle();
 
 // Returns the unique ID for the specified process. This is functionally the
 // same as Windows' GetProcessId(), but works on versions of Windows before
 // 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
 // forget to quote it.
 //
 // If wait is true, it will block and wait for the other process to finish,
 // otherwise, it will just continue asynchronously.
 //
 // Example (including literal quotes)
 //  cmdline = "c:\windows\explorer.exe" -foo "c:\bar\"
 //
 // If process_handle is non-NULL, the process handle of the launched app will be
 // stored there on a successful launch.
 // NOTE: In this case, the caller is responsible for closing the handle so
 //       that it doesn't leak!
 bool LaunchApp(const std::wstring& cmdline,
                bool wait, bool start_hidden, ProcessHandle* process_handle);
 #elif defined(OS_POSIX)
 // 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
 
 // Execute the application specified by cl. This function delegates to one
 // of the above two platform-specific functions.
 bool LaunchApp(const CommandLine& cl,
                bool wait, bool start_hidden, ProcessHandle* process_handle);
 
 // Used to filter processes by process ID.
 class ProcessFilter {
@@ skipping 211 matching lines @@
 // overflow. Has no effect if the OS doesn't provide the necessary facility.
 void EnableTerminationOnHeapCorruption();
 
 // If supported on the platform, and the user has sufficent rights, increase
 // the current process's scheduling priority to a high priority.
 void RaiseProcessToHighPriority();
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_UTIL_H_