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author | Richard Maw <richard.maw@codethink.co.uk> | 2012-01-11 10:45:00 +0000 |
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committer | Richard Maw <richard.maw@codethink.co.uk> | 2012-01-11 10:45:00 +0000 |
commit | 24d1733e78a17d71aea6912144394ed7d3a82d50 (patch) | |
tree | 069608d934a8716d55a94c62c4bd75c1152f868c /gnu/pipe2-safer.c | |
parent | d7b9fe130c2305d44fa1023283d3c2fcd389ba93 (diff) | |
download | m4-24d1733e78a17d71aea6912144394ed7d3a82d50.tar.gz |
remove .gitignores and add the rest of the files
Diffstat (limited to 'gnu/pipe2-safer.c')
-rwxr-xr-x | gnu/pipe2-safer.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/gnu/pipe2-safer.c b/gnu/pipe2-safer.c new file mode 100755 index 00000000..034fcd87 --- /dev/null +++ b/gnu/pipe2-safer.c @@ -0,0 +1,52 @@ +/* Invoke pipe2, but avoid some glitches. + Copyright (C) 2005, 2006, 2009, 2010 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 <http://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; +} |