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Retry the discovery a few times when no devices are found.

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This commit is contained in:
Jef Driesen 2009-03-20 08:48:17 +00:00
parent 5cb754b01b
commit 39f3a5b757
1 changed files with 23 additions and 8 deletions
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31
src/irda.c
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@ -252,21 +252,36 @@ irda_socket_discover (irda *device, irda_callback_t callback, void *userdata)
#endif #endif
int rc = 0; int rc = 0;
unsigned int n = 0; unsigned int nretries = 0;
while ((rc = getsockopt (device->fd, SOL_IRLMP, IRLMP_ENUMDEVICES, (char*) data, &size)) != 0) { while ((rc = getsockopt (device->fd, SOL_IRLMP, IRLMP_ENUMDEVICES, (char*) data, &size)) != 0 ||
#ifdef _WIN32 #ifdef _WIN32
if (WSAGetLastError() != WSAEWOULDBLOCK) { list->numDevice == 0)
#else #else
if (errno != EAGAIN) { list->len == 0)
#endif #endif
TRACE ("getsockopt"); {
return -1; // Error during getsockopt call. // Automatically retry the discovery when no devices were found.
// On Linux, getsockopt fails with EAGAIN when no devices are
// discovered, while on Windows it succeeds and sets the number
// of devices to zero. Both situations are handled the same here.
if (rc != 0) {
#ifdef _WIN32
if (WSAGetLastError() != WSAEWOULDBLOCK) {
#else
if (errno != EAGAIN) {
#endif
TRACE ("getsockopt");
return -1; // Error during getsockopt call.
}
} }
if (n >= DISCOVER_MAX_RETRIES) // Abort if the maximum number of retries is reached.
if (nretries++ >= DISCOVER_MAX_RETRIES)
return 0; return 0;
n++; // Restore the size parameter in case it was
// modified by the previous getsockopt call.
size = sizeof (data);
#ifdef _WIN32 #ifdef _WIN32
Sleep (1000); Sleep (1000);