Mercurial > gnulib
view lib/fd-safer.c @ 40198:5a34193cbc07
long-options: add parse_gnu_standard_options_only
Discussed in https://bugs.gnu.org/33468 .
* lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead
of 0.
(parse_gnu_standard_options_only): Add function to
process the GNU default options --help and --version and fail for any other
unknown long or short option. See
https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html .
* lib/long-options.h (parse_gnu_standard_options_only): Declare it.
* modules/long-options (depends-on): Add stdbool, exitfail.
* top/maint.mk (sc_prohibit_long_options_without_use): Update
syntax-check rule, add new function name.
author | Bernhard Voelker <mail@bernhard-voelker.de> |
---|---|
date | Thu, 29 Nov 2018 09:06:26 +0100 |
parents | b06060465f09 |
children |
line wrap: on
line source
/* Return a safer copy of a file descriptor. Copyright (C) 2005-2006, 2009-2019 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 Paul Eggert. */ #include <config.h> #include "unistd-safer.h" #include <errno.h> #include <unistd.h> /* Return FD, unless FD would be a copy of standard input, output, or error; in that case, return a duplicate of FD, closing FD. On failure to duplicate, close FD, set errno, and return -1. Preserve errno if FD is negative, so that the caller can always inspect errno when the returned value is negative. This function is usefully wrapped around functions that return file descriptors, e.g., fd_safer (open ("file", O_RDONLY)). */ int fd_safer (int fd) { if (STDIN_FILENO <= fd && fd <= STDERR_FILENO) { int f = dup_safer (fd); int e = errno; close (fd); errno = e; fd = f; } return fd; }