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tools/usbwait/usbwait.c: new option -r to require removal before appearance

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- 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
This commit is contained in:
Werner Almesberger 2011-05-11 05:21:45 -03:00
parent 7037858a3e
commit 62a03bbf32
1 changed files with 16 additions and 4 deletions
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18
tools/usbwait/usbwait.c
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@ -24,19 +24,27 @@
static useconds_t interval_us = DEFAULT_POLL_S*1000000;
static unsigned long timeout = 0;
static int need_removal = 0;
static void wait_for_usb(void)
{
struct timeval to, now;
usb_dev_handle *dev;
gettimeofday(&to, NULL);
to.tv_sec += timeout;
while (1) {
usb_rescan();
if (open_usb(0, 0))
dev = open_usb(0, 0);
if (dev) {
if (!need_removal)
return;
usb_close(dev);
} else {
need_removal = 0;
}
if (timeout) {
gettimeofday(&now, NULL);
if (now.tv_sec > to.tv_sec)
@ -59,9 +67,10 @@ static void wait_for_usb(void)
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s [-i poll_s] [-p path] [-t timeout_s] [vendor]:[product]\n\n"
"usage: %s [-i poll_s] [-p path] [-r] [-t timeout_s] [vendor]:[product]\n\n"
" -i poll_s poll interval in seconds (default: %g s)\n"
" -p path USB device path\n"
" -r wait for device removal first\n"
" -t timeout_s timeout in seconds (default: infinite)\n"
, name, DEFAULT_POLL_S);
exit(1);
@ -73,7 +82,7 @@ int main(int argc, char **argv)
char *end;
int c;
while ((c = getopt(argc, argv, "i:p:t:")) != EOF)
while ((c = getopt(argc, argv, "i:p:rt:")) != EOF)
switch (c) {
case 'i':
interval_us = strtod(optarg, &end)*1000000;
@ -83,6 +92,9 @@ int main(int argc, char **argv)
case 'p':
restrict_usb_path(optarg);
break;
case 'r':
need_removal = 1;
break;
case 't':
timeout = strtoul(optarg, &end, 0);
if (*end || !timeout)