1 files changed, 86 insertions, 0 deletions
diff --git a/lib/spawn_faction_addopen.c b/lib/spawn_faction_addopen.c
new file mode 100644
index 0000000..a3fc22e
--- /dev/null
+++ b/lib/spawn_faction_addopen.c
@@ -0,0 +1,86 @@
+/* Copyright (C) 2000, 2009-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU 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 <stdlib.h>
+#include <string.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
+   'open' for the given file during the 'spawn' call.  */
+int
+posix_spawn_file_actions_addopen (posix_spawn_file_actions_t *file_actions,
+                                  int fd, const char *path, int oflag,
+                                  mode_t mode)
+#undef posix_spawn_file_actions_addopen
+{
+  int maxfd = __sysconf (_SC_OPEN_MAX);
+
+  /* Test for the validity of the file descriptor.  */
+  if (fd < 0 || fd >= maxfd)
+    return EBADF;
+
+#if !REPLACE_POSIX_SPAWN
+  return posix_spawn_file_actions_addopen (file_actions, fd, path, oflag, mode);
+#else
+  {
+    /* Copy PATH, because the caller may free it before calling posix_spawn()
+       or posix_spawnp().  */
+    char *path_copy = strdup (path);
+    if (path_copy == NULL)
+      return ENOMEM;
+
+    /* 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.  */
+        free (path_copy);
+        return ENOMEM;
+      }
+
+    {
+      struct __spawn_action *rec;
+
+      /* Add the new value.  */
+      rec = &file_actions->_actions[file_actions->_used];
+      rec->tag = spawn_do_open;
+      rec->action.open_action.fd = fd;
+      rec->action.open_action.path = path_copy;
+      rec->action.open_action.oflag = oflag;
+      rec->action.open_action.mode = mode;
+
+      /* Account for the new entry.  */
+      ++file_actions->_used;
+
+      return 0;
+    }
+  }
+#endif
+}