1 files changed, 52 insertions, 0 deletions
diff --git a/librt/spawn_faction_adddup2.c b/librt/spawn_faction_adddup2.c
new file mode 100644
index 000000000..6d7331326
--- /dev/null
+++ b/librt/spawn_faction_adddup2.c
@@ -0,0 +1,52 @@
+/* Copyright (C) 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <spawn.h>
+#include <unistd.h>
+
+#include "spawn_int.h"
+
+/* Add an action to FILE-ACTIONS which tells the implementation to call
+   `dup2' for the given file descriptors during the `spawn' call.  */
+int
+posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
+				 int fd, int newfd)
+{
+	int maxfd = sysconf(_SC_OPEN_MAX);
+	struct __spawn_action *rec;
+
+	/* Test for the validity of the file descriptor.  */
+	if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd)
+		return EBADF;
+
+	/* Allocate more memory if needed.  */
+	if (file_actions->__used == file_actions->__allocated
+	    && __posix_spawn_file_actions_realloc (file_actions) != 0)
+		/* This can only mean we ran out of memory.  */
+		return ENOMEM;
+
+	/* Add the new value.  */
+	rec = &file_actions->__actions[file_actions->__used];
+	rec->tag = spawn_do_dup2;
+	rec->action.dup2_action.fd = fd;
+	rec->action.dup2_action.newfd = newfd;
+
+	/* Account for the new entry.  */
+	++file_actions->__used;
+	return 0;
+}