posix: New function posix_spawn_file_actions_addfchdir_np [BZ #17405]

Along with posix_spawn_file_actions_addchdir,
posix_spawn_file_actions_addfchdir is the subject of a change proposal
for POSIX: <http://austingroupbugs.net/view.php?id=1208>

1 files changed, 46 insertions, 0 deletions

diff --git a/posix/spawn_faction_addfchdir.c b/posix/spawn_faction_addfchdir.c
new file mode 100644
index 0000000000..6f069df29e
--- /dev/null
+++ b/posix/spawn_faction_addfchdir.c
@@ -0,0 +1,46 @@
+/* Add a directory change to a file action list for posix_spawn.
+   Copyright (C) 2000-2018 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 <string.h>
+
+#include "spawn_int.h"
+
+int
+posix_spawn_file_actions_addfchdir_np (posix_spawn_file_actions_t *actions,
+                                       int fd)
+{
+  struct __spawn_action *rec;
+
+  /* Allocate more memory if needed.  */
+  if (actions->__used == actions->__allocated
+      && __posix_spawn_file_actions_realloc (actions) != 0)
+    /* This can only mean we ran out of memory.  */
+    return ENOMEM;
+
+  /* Add the new value.  */
+  rec = &actions->__actions[actions->__used];
+  rec->tag = spawn_do_fchdir;
+  rec->action.fchdir_action.fd = fd;
+
+  /* Account for the new entry.  */
+  ++actions->__used;
+
+  return 0;
+}