Mercurial > gnulib
view lib/xnanosleep.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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/* xnanosleep.c -- a more convenient interface to nanosleep Copyright (C) 2002-2007, 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/>. */ /* Mostly written (for sleep.c) by Paul Eggert. Factored out (creating this file) by Jim Meyering. */ #include <config.h> #include "xnanosleep.h" #include <timespec.h> #include <errno.h> #include <time.h> /* Sleep until the time (call it WAKE_UP_TIME) specified as SECONDS seconds after the time this function is called. SECONDS must be non-negative. If SECONDS is so large that it is not representable as a 'struct timespec', then use the maximum value for that interval. Return -1 on failure (setting errno), 0 on success. */ int xnanosleep (double seconds) { struct timespec ts_sleep = dtotimespec (seconds); for (;;) { /* Linux-2.6.8.1's nanosleep returns -1, but doesn't set errno when resumed after being suspended. Earlier versions would set errno to EINTR. nanosleep from linux-2.6.10, as well as implementations by (all?) other vendors, doesn't return -1 in that case; either it continues sleeping (if time remains) or it returns zero (if the wake-up time has passed). */ errno = 0; if (nanosleep (&ts_sleep, NULL) == 0) break; if (errno != EINTR && errno != 0) return -1; } return 0; }