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MESSAGE: Flush Message/ast_msg_queue channel alert pipe.

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ASTERISK-25083

Change-Id: Id54baa57a8dbca84e29f28bcd2ffc0a5ac12d8b2
This commit is contained in:
Richard Mudgett
2016-12-12 18:38:42 -06:00
parent 31268e0a28
commit 44e72c9d44
3 changed files with 65 additions and 7 deletions
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62
main/channel_internal_api.c
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@@ -1239,14 +1239,9 @@ int ast_channel_alert_write(struct ast_channel *chan)
return write(chan->alertpipe[1], &blah, sizeof(blah)) != sizeof(blah);
}
ast_alert_status_t ast_channel_internal_alert_read(struct ast_channel *chan)
static int channel_internal_alert_check_nonblock(struct ast_channel *chan)
{
int flags;
char blah;
if (!ast_channel_internal_alert_readable(chan)) {
return AST_ALERT_NOT_READABLE;
}
flags = fcntl(chan->alertpipe[0], F_GETFL);
/* For some odd reason, the alertpipe occasionally loses nonblocking status,
@@ -1255,9 +1250,62 @@ ast_alert_status_t ast_channel_internal_alert_read(struct ast_channel *chan)
ast_log(LOG_ERROR, "Alertpipe on channel %s lost O_NONBLOCK?!!\n", ast_channel_name(chan));
if (fcntl(chan->alertpipe[0], F_SETFL, flags | O_NONBLOCK) < 0) {
ast_log(LOG_WARNING, "Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
return AST_ALERT_READ_FATAL;
return -1;
}
}
return 0;
}
ast_alert_status_t ast_channel_internal_alert_flush(struct ast_channel *chan)
{
int bytes_read;
char blah[100];
if (!ast_channel_internal_alert_readable(chan)) {
return AST_ALERT_NOT_READABLE;
}
if (channel_internal_alert_check_nonblock(chan)) {
return AST_ALERT_READ_FATAL;
}
/* Read the alertpipe until it is exhausted. */
for (;;) {
bytes_read = read(chan->alertpipe[0], blah, sizeof(blah));
if (bytes_read < 0) {
if (errno == EINTR) {
continue;
}
if (errno == EAGAIN || errno == EWOULDBLOCK) {
/*
* Would block so nothing left to read.
* This is the normal loop exit.
*/
break;
}
ast_log(LOG_WARNING, "read() failed flushing alertpipe: %s\n",
strerror(errno));
return AST_ALERT_READ_FAIL;
}
if (!bytes_read) {
/* Read nothing so we are done */
break;
}
}
return AST_ALERT_READ_SUCCESS;
}
ast_alert_status_t ast_channel_internal_alert_read(struct ast_channel *chan)
{
char blah;
if (!ast_channel_internal_alert_readable(chan)) {
return AST_ALERT_NOT_READABLE;
}
if (channel_internal_alert_check_nonblock(chan)) {
return AST_ALERT_READ_FATAL;
}
if (read(chan->alertpipe[0], &blah, sizeof(blah)) < 0) {
if (errno != EINTR && errno != EAGAIN) {
ast_log(LOG_WARNING, "read() failed: %s\n", strerror(errno));