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Diffstat (limited to 'librt/spawn_faction_adddup2.c')
-rw-r--r--librt/spawn_faction_adddup2.c52
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;
+}