IEEE 802.15.4 subsystem
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| Source at commit 79c9e3c1341fb475ea45b802ac1e5a9d4ce62aa8 created 7 years 3 months ago. By Werner Almesberger, atusb/Makefile (f, b): swap mask and copper layers for better visualization | |
|---|---|
| 1 | /* |
| 2 | * usbwait/usbwait.c - Wait for a USB device to appear |
| 3 | * |
| 4 | * Written 2011 by Werner Almesberger |
| 5 | * Copyright 2011 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #include <stdlib.h> |
| 15 | #include <stdio.h> |
| 16 | #include <unistd.h> |
| 17 | #include <sys/time.h> |
| 18 | |
| 19 | #include "usbopen.h" |
| 20 | |
| 21 | |
| 22 | #define DEFAULT_POLL_S 0.1 |
| 23 | |
| 24 | |
| 25 | static useconds_t interval_us = DEFAULT_POLL_S*1000000; |
| 26 | static unsigned long timeout = 0; |
| 27 | static int need_removal = 0; |
| 28 | |
| 29 | |
| 30 | static void wait_for_usb(void) |
| 31 | { |
| 32 | struct timeval to, now; |
| 33 | usb_dev_handle *dev; |
| 34 | |
| 35 | gettimeofday(&to, NULL); |
| 36 | to.tv_sec += timeout; |
| 37 | |
| 38 | while (1) { |
| 39 | usb_rescan(); |
| 40 | dev = open_usb(0, 0); |
| 41 | if (dev) { |
| 42 | if (!need_removal) |
| 43 | return; |
| 44 | usb_close(dev); |
| 45 | } else { |
| 46 | need_removal = 0; |
| 47 | } |
| 48 | if (timeout) { |
| 49 | gettimeofday(&now, NULL); |
| 50 | if (now.tv_sec > to.tv_sec) |
| 51 | break; |
| 52 | if (now.tv_sec == to.tv_sec && |
| 53 | now.tv_usec > to.tv_usec) |
| 54 | break; |
| 55 | } |
| 56 | if (usleep(interval_us) < 0) { |
| 57 | perror("usleep"); |
| 58 | exit(1); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | fprintf(stderr, "timeout\n"); |
| 63 | exit(1); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | static void usage(const char *name) |
| 68 | { |
| 69 | fprintf(stderr, |
| 70 | "usage: %s [-i poll_s] [-p path] [-r] [-t timeout_s] [vendor]:[product]\n\n" |
| 71 | " -i poll_s poll interval in seconds (default: %g s)\n" |
| 72 | " -p path USB device path\n" |
| 73 | " -r wait for device removal first\n" |
| 74 | " -t timeout_s timeout in seconds (default: infinite)\n" |
| 75 | , name, DEFAULT_POLL_S); |
| 76 | exit(1); |
| 77 | } |
| 78 | |
| 79 | |
| 80 | int main(int argc, char **argv) |
| 81 | { |
| 82 | char *end; |
| 83 | int c; |
| 84 | |
| 85 | while ((c = getopt(argc, argv, "i:p:rt:")) != EOF) |
| 86 | switch (c) { |
| 87 | case 'i': |
| 88 | interval_us = strtod(optarg, &end)*1000000; |
| 89 | if (*end || interval_us < 0) |
| 90 | usage(*argv); |
| 91 | break; |
| 92 | case 'p': |
| 93 | restrict_usb_path(optarg); |
| 94 | break; |
| 95 | case 'r': |
| 96 | need_removal = 1; |
| 97 | break; |
| 98 | case 't': |
| 99 | timeout = strtoul(optarg, &end, 0); |
| 100 | if (*end || !timeout) |
| 101 | usage(*argv); |
| 102 | break; |
| 103 | default: |
| 104 | usage(*argv); |
| 105 | } |
| 106 | |
| 107 | if (argc != optind+1) |
| 108 | usage(*argv); |
| 109 | |
| 110 | parse_usb_id(argv[optind]); |
| 111 | wait_for_usb(); |
| 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | |
