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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 2026
* Project Tick. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _POSIX_C_SOURCE 200809L
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* Linux libcs commonly hide sync(2) behind non-POSIX feature macros.
* Declare the documented interface explicitly so the port stays buildable
* under strict C/POSIX settings without enabling GNU extensions.
*/
extern void sync(void);
static const char *progname = "sync";
static void usage_error(const char *fmt, ...)
__attribute__((format(printf, 1, 2), noreturn));
int
main(int argc, char *argv[])
{
const char *slash;
if (argv[0] != NULL && argv[0][0] != '\0') {
slash = strrchr(argv[0], '/');
progname = (slash != NULL && slash[1] != '\0') ? slash + 1 : argv[0];
}
if (argc > 1)
usage_error("unexpected argument: %s", argv[1]);
sync();
return (0);
}
static void
usage_error(const char *fmt, ...)
{
va_list ap;
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\nusage: %s\n", progname);
exit(1);
}
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