summaryrefslogtreecommitdiffstats
path: root/lib/spawn_faction_adddup2.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/spawn_faction_adddup2.c')
-rw-r--r--lib/spawn_faction_adddup2.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/spawn_faction_adddup2.c b/lib/spawn_faction_adddup2.c
new file mode 100644
index 0000000..8d257ae
--- /dev/null
+++ b/lib/spawn_faction_adddup2.c
@@ -0,0 +1,70 @@
+/* Copyright (C) 2000, 2009-2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ This file 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.
+
+ This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <spawn.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#if !_LIBC
+# define __sysconf(open_max) getdtablesize ()
+#endif
+
+#if REPLACE_POSIX_SPAWN
+# include "spawn_int.h"
+#endif
+
+/* 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)
+#undef posix_spawn_file_actions_adddup2
+{
+ int maxfd = __sysconf (_SC_OPEN_MAX);
+
+ /* Test for the validity of the file descriptor. */
+ if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd)
+ return EBADF;
+
+#if !REPLACE_POSIX_SPAWN
+ return posix_spawn_file_actions_adddup2 (file_actions, fd, newfd);
+#else
+ /* 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;
+
+ {
+ struct __spawn_action *rec;
+
+ /* 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;
+ }
+#endif
+}