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author | Sam Thursfield <sam.thursfield@codethink.co.uk> | 2012-12-21 14:22:22 +0000 |
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committer | Sam Thursfield <Sam Thursfield> | 2013-01-03 11:32:53 +0000 |
commit | c2693d6d08db26825688ddca5de6eb8a4b7cde4a (patch) | |
tree | 10611dcf065b1893421b83a9de53cf6feb83a048 /lib/dup-safer-flag.c | |
parent | 861325a84f231a2a2da307b53ef5ff527d67e876 (diff) | |
download | m4-c2693d6d08db26825688ddca5de6eb8a4b7cde4a.tar.gz |
Commit files from tarball
Diffstat (limited to 'lib/dup-safer-flag.c')
-rw-r--r-- | lib/dup-safer-flag.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/lib/dup-safer-flag.c b/lib/dup-safer-flag.c new file mode 100644 index 00000000..e922b91b --- /dev/null +++ b/lib/dup-safer-flag.c @@ -0,0 +1,40 @@ +/* Duplicate a file descriptor result, avoiding clobbering + STD{IN,OUT,ERR}_FILENO, with specific flags. + + Copyright (C) 2001, 2004-2006, 2009-2011 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 Paul Eggert and Eric Blake. */ + +#include <config.h> + +/* Specification. */ +#include "unistd-safer.h" + +#include <fcntl.h> +#include <unistd.h> + +#include "cloexec.h" + +/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or + STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like + fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */ + +int +dup_safer_flag (int fd, int flag) +{ + return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD, + STDERR_FILENO + 1); +} |