| /* |
| * 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; |
| } |