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-rw-r--r--posix/spawn_valid_fd.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/posix/spawn_valid_fd.c b/posix/spawn_valid_fd.c
new file mode 100644
index 0000000000..c199750557
--- /dev/null
+++ b/posix/spawn_valid_fd.c
@@ -0,0 +1,31 @@
+/* File descriptor validity check for posix_spawn file actions.
+ Copyright (C) 2000-2016 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 "spawn_int.h"
+
+#include <unistd.h>
+
+bool
+internal_function
+__spawn_valid_fd (int fd)
+{
+ long maxfd = __sysconf (_SC_OPEN_MAX);
+ return __glibc_likely (fd >= 0)
+ && (__glibc_unlikely (maxfd < 0) /* No limit set. */
+ || __glibc_likely (fd < maxfd));
+}