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ftmod_misdn: Retry recvfrom() in case of EAGAIN

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epoll_wait() on the B-channel socket may indicate pending messages, but
recvfrom() returns EAGAIN. Retry a few more times (up to 5 retries)
to get the pending message.

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
This commit is contained in:
Stefan Knoblich 2013-01-07 13:24:01 +01:00
parent 01c1195ef4
commit 95ac0ecc2f
1 changed files with 12 additions and 3 deletions
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15
libs/freetdm/src/ftmod/ftmod_misdn/ftmod_misdn.c
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@ -2269,14 +2269,23 @@ static ftdm_status_t handle_b_channel_event(ftdm_channel_t *chan)
struct misdn_chan_private *priv = ftdm_chan_io_private(chan); struct misdn_chan_private *priv = ftdm_chan_io_private(chan);
char buf[MAX_DATA_MEM] = { 0 }; char buf[MAX_DATA_MEM] = { 0 };
struct mISDNhead *mh = (void *)buf; struct mISDNhead *mh = (void *)buf;
int retval; int retval, retries = 5;
if ((retval = recvfrom(chan->sockfd, buf, sizeof(buf), 0, NULL, NULL)) <= 0) { do {
/*
* Retry reading multiple times if recvfrom() returns EAGAIN
*/
retval = recvfrom(chan->sockfd, buf, sizeof(buf), 0, NULL, NULL);
if (retval < 0 && errno != EAGAIN)
break;
} while (retval < 0 && retries-- > 0);
if (retval < 0) {
ftdm_log_chan(chan, FTDM_LOG_ERROR, "mISDN failed to receive message: %s\n", ftdm_log_chan(chan, FTDM_LOG_ERROR, "mISDN failed to receive message: %s\n",
strerror(errno)); strerror(errno));
return FTDM_FAIL; return FTDM_FAIL;
} }
if (retval < MISDN_HEADER_LEN) { if (retval < MISDN_HEADER_LEN) {
ftdm_log_chan(chan, FTDM_LOG_ERROR, "mISDN message too short, min.: %d, read: %d\n", ftdm_log_chan(chan, FTDM_LOG_ERROR, "mISDN message too short, min.: %d, read: %d\n",
(int)MISDN_HEADER_LEN, retval); (int)MISDN_HEADER_LEN, retval);