mirror of
git://projects.qi-hardware.com/ben-wpan.git
synced 2024-11-23 00:28:26 +02:00
62a03bbf32
- usbwait.c (need_removal, wait_for_usb): if need_removal is set, wait for the device to be removed before trying to find it - usbwait.c (usage, main): new option -r to set need_removal
115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
/*
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* usbwait/usbwait.c - Wait for a USB device to appear
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include "usbopen.h"
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#define DEFAULT_POLL_S 0.1
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static useconds_t interval_us = DEFAULT_POLL_S*1000000;
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static unsigned long timeout = 0;
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static int need_removal = 0;
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static void wait_for_usb(void)
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{
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struct timeval to, now;
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usb_dev_handle *dev;
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gettimeofday(&to, NULL);
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to.tv_sec += timeout;
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while (1) {
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usb_rescan();
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dev = open_usb(0, 0);
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if (dev) {
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if (!need_removal)
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return;
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usb_close(dev);
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} else {
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need_removal = 0;
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}
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if (timeout) {
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gettimeofday(&now, NULL);
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if (now.tv_sec > to.tv_sec)
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break;
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if (now.tv_sec == to.tv_sec &&
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now.tv_usec > to.tv_usec)
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break;
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}
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if (usleep(interval_us) < 0) {
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perror("usleep");
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exit(1);
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}
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}
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fprintf(stderr, "timeout\n");
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exit(1);
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}
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static void usage(const char *name)
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{
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fprintf(stderr,
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"usage: %s [-i poll_s] [-p path] [-r] [-t timeout_s] [vendor]:[product]\n\n"
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" -i poll_s poll interval in seconds (default: %g s)\n"
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" -p path USB device path\n"
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" -r wait for device removal first\n"
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" -t timeout_s timeout in seconds (default: infinite)\n"
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, name, DEFAULT_POLL_S);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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char *end;
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int c;
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while ((c = getopt(argc, argv, "i:p:rt:")) != EOF)
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switch (c) {
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case 'i':
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interval_us = strtod(optarg, &end)*1000000;
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if (*end || interval_us < 0)
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usage(*argv);
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break;
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case 'p':
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restrict_usb_path(optarg);
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break;
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case 'r':
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need_removal = 1;
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break;
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case 't':
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timeout = strtoul(optarg, &end, 0);
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if (*end || !timeout)
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usage(*argv);
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break;
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default:
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usage(*argv);
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}
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if (argc != optind+1)
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usage(*argv);
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parse_usb_id(argv[optind]);
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wait_for_usb();
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return 0;
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}
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