/*
|
* Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz>
|
*
|
* 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 2 of
|
* the License, or (at your option) any later version.
|
*
|
* This program is distributed in the hope that it would 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, write the Free Software Foundation,
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
*/
|
|
#include <stdio.h>
|
#include <unistd.h>
|
#include <stdlib.h>
|
#include <string.h>
|
|
static void print_help(void)
|
{
|
printf("Usage: tst_usleep interval[s|ms|us]\n\n");
|
printf(" If no unit is specified the interval is in seconds\n");
|
}
|
|
static struct unit {
|
const char *unit;
|
long mul;
|
} units[] = {
|
{"", 1000000},
|
{"s", 1000000},
|
{"ms", 1000},
|
{"us", 1},
|
};
|
|
static unsigned int units_len = sizeof(units) / sizeof(*units);
|
|
int main(int argc, char *argv[])
|
{
|
int opt;
|
long interval, secs = 0, usecs = 0;
|
unsigned int i;
|
char *end;
|
|
while ((opt = getopt(argc, argv, ":h")) != -1) {
|
switch (opt) {
|
case 'h':
|
print_help();
|
return 0;
|
default:
|
print_help();
|
return 1;
|
}
|
}
|
|
if (optind >= argc) {
|
fprintf(stderr, "ERROR: Expected interval argument\n\n");
|
print_help();
|
return 1;
|
}
|
|
interval = strtol(argv[optind], &end, 10);
|
|
if (argv[optind] == end) {
|
fprintf(stderr, "ERROR: Invalid interval '%s'\n\n",
|
argv[optind]);
|
print_help();
|
return 1;
|
}
|
|
for (i = 0; i < units_len; i++) {
|
if (!strcmp(units[i].unit, end))
|
break;
|
}
|
|
if (i >= units_len) {
|
fprintf(stderr, "ERROR: Invalid interval unit '%s'\n\n", end);
|
print_help();
|
return 1;
|
}
|
|
if (units[i].mul == 1000000)
|
secs = interval;
|
|
if (units[i].mul == 1000) {
|
secs = interval / 1000;
|
usecs = (interval % 1000) * 1000;
|
}
|
|
if (units[i].mul == 1) {
|
secs = interval / 1000000;
|
usecs = interval % 1000000;
|
}
|
|
if (secs)
|
sleep(secs);
|
|
if (usecs)
|
usleep(usecs);
|
|
return 0;
|
}
|
