From e1908ae95dd4c9d19ee4dfabfc8bf8a7f85943fe Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 18:58:41 +0200 Subject: Adding upstream version 9.4. Signed-off-by: Daniel Baumann --- lib/pipe-safer.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 lib/pipe-safer.c (limited to 'lib/pipe-safer.c') diff --git a/lib/pipe-safer.c b/lib/pipe-safer.c new file mode 100644 index 0000000..750d097 --- /dev/null +++ b/lib/pipe-safer.c @@ -0,0 +1,52 @@ +/* Invoke pipe, but avoid some glitches. + Copyright (C) 2005-2006, 2009-2023 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 . */ + +/* Written by Jim Meyering. */ + +#include + +#include "unistd-safer.h" + +#include +#include + +/* 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; +} -- cgit v1.2.3