utils-std

sleep.c (1194B)

// utils-std: Collection of commonly available Unix tools
// SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
// SPDX-License-Identifier: MPL-2.0
#define _POSIX_C_SOURCE 200809L
#include "../lib/strtodur.h"
#include <errno.h> // errno
#include <stdio.h> // fprintf, perror
#include <time.h>  // nanosleep
const char *argv0 = "sleep";
int
main(int argc, char *argv[])
{
	struct timespec dur = {.tv_sec = 0, .tv_nsec = 0};
	for(int i = 1; i < argc; i++)
	{
		struct timespec arg_dur = {.tv_sec = 0, .tv_nsec = 0};
		if(strtodur(argv[i], &arg_dur) < 0)
		{
			return 1;
		}
		dur.tv_sec += arg_dur.tv_sec;
		dur.tv_nsec += arg_dur.tv_nsec;
		if(dur.tv_nsec > 999999999)
		{
			dur.tv_nsec = 0;
			dur.tv_sec += 1;
		}
	}
	if(dur.tv_sec == 0 && dur.tv_nsec == 0)
	{
		fprintf(stderr, "sleep: error: Got a total duration of 0\n");
		return 1;
	}
	errno = 0;
	if(nanosleep(&dur, &dur) < 0)
	{
		if(errno == EINTR)
		{
			fprintf(stderr,
			        "sleep: warning: Interrupted during sleep, still had %ld.%09ld seconds remaining\n",
			        dur.tv_sec,
			        dur.tv_nsec);
		}
		else
		{
			perror("sleep: warning: nanosleep");
		}
	}
	return 0;
}