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+/* Invoke pipe2, 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 Eric Blake. */
+
+#include <config.h>
+
+/* Specification. */
+#include "unistd-safer.h"
+
+#include <unistd.h>
+#include <errno.h>
+
+/* Like pipe2, but ensure that neither of the file descriptors is
+ STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. */
+
+int
+pipe2_safer (int fd[2], int flags)
+{
+ /* This is a generalization of the pipe_safer implementation. */
+ if (pipe2 (fd, flags) == 0)
+ {
+ int i;
+ for (i = 0; i < 2; i++)
+ {
+ fd[i] = fd_safer_flag (fd[i], flags);
+ if (fd[i] < 0)
+ {
+ int e = errno;
+ close (fd[1 - i]);
+ errno = e;
+ return -1;
+ }
+ }
+
+ return 0;
+ }
+ return -1;
+}