Mercurial > gnulib
view lib/usleep.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 |
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/* Pausing execution of the current thread. Copyright (C) 2009-2019 Free Software Foundation, Inc. Written by Eric Blake <ebb9@byu.net>, 2009. 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/>. */ /* This file is _intentionally_ light-weight. Rather than using select or nanosleep, both of which drag in external libraries on some platforms, this merely rounds up to the nearest second if usleep() does not exist. If sub-second resolution is important, then use a more powerful interface to begin with. */ #include <config.h> /* Specification. */ #include <unistd.h> #include <errno.h> #ifndef HAVE_USLEEP # define HAVE_USLEEP 0 #endif /* Sleep for MICRO microseconds, which can be greater than 1 second. Return -1 and set errno to EINVAL on range error (about 4295 seconds), or 0 on success. Interaction with SIGALARM is unspecified. */ int usleep (useconds_t micro) { unsigned int seconds = micro / 1000000; if (sizeof seconds < sizeof micro && micro / 1000000 != seconds) { errno = EINVAL; return -1; } if (!HAVE_USLEEP && micro % 1000000) seconds++; while ((seconds = sleep (seconds)) != 0); #undef usleep #if !HAVE_USLEEP # define usleep(x) 0 #endif return usleep (micro % 1000000); }