summaryrefslogtreecommitdiffstats
path: root/gl/lib/pipe-safer.c
diff options
context:
space:
mode:
Diffstat (limited to 'gl/lib/pipe-safer.c')
-rw-r--r--gl/lib/pipe-safer.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/gl/lib/pipe-safer.c b/gl/lib/pipe-safer.c
new file mode 100644
index 0000000..22f8695
--- /dev/null
+++ b/gl/lib/pipe-safer.c
@@ -0,0 +1,52 @@
+/* Invoke pipe, but avoid some glitches.
+ Copyright (C) 2005-2006, 2009-2022 Free Software Foundation, Inc.
+
+ 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/>. */
+
+/* Written by Jim Meyering. */
+
+#include <config.h>
+
+#include "unistd-safer.h"
+
+#include <unistd.h>
+#include <errno.h>
+
+/* Like pipe, but ensure that neither of the file descriptors is
+ STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. Fail with ENOSYS on
+ platforms that lack pipe. */
+
+int
+pipe_safer (int fd[2])
+{
+ if (pipe (fd) == 0)
+ {
+ int i;
+ for (i = 0; i < 2; i++)
+ {
+ fd[i] = fd_safer (fd[i]);
+ if (fd[i] < 0)
+ {
+ int saved_errno = errno;
+ close (fd[1 - i]);
+ errno = saved_errno;
+ return -1;
+ }
+ }
+
+ return 0;
+ }
+
+ return -1;
+}