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shell/mqtt: Handle negative return value of wait

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`wait()` returns the retval of `zsock_poll()` which can be
negative but is currently unhandled.

This patch make sure that the error will be handled.

Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>
This commit is contained in:
Yong Cong Sin 2022-08-18 00:02:37 +08:00 • committed by Carles Cufí
commit 148317f075
1 changed files with 19 additions and 3 deletions
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22
subsys/shell/backends/shell_mqtt.c
View file

@ -106,6 +106,13 @@ static void clear_fds(void)
sh_mqtt->nfds = 0;
}
/*
* Upon successful completion, poll() shall return a non-negative value. A positive value indicates
* the total number of pollfd structures that have selected events (that is, those for which the
* revents member is non-zero). A value of 0 indicates that the call timed out and no file
* descriptors have been selected. Upon failure, poll() shall return -1 and set errno to indicate
* the error.
*/
static int wait(int timeout)
{
int rc = 0;
@ -252,13 +259,16 @@ static void sh_mqtt_process_handler(struct k_work *work)
(sh_mqtt->transport_state == SHELL_MQTT_TRANSPORT_CONNECTED) &&
(sh_mqtt->subscribe_state == SHELL_MQTT_SUBSCRIBED)) {
LOG_DBG("Listening to socket");
if (wait(remaining)) {
rc = wait(remaining);
if (rc > 0) {
LOG_DBG("Process socket for MQTT packet");
rc = mqtt_input(&sh_mqtt->mqtt_cli);
if (rc != 0) {
LOG_ERR("%s error: %d", "processed: mqtt_input", rc);
goto process_error;
}
} else if (rc < 0) {
goto process_error;
}
LOG_DBG("MQTT %s", "Keepalive");
@ -317,13 +327,16 @@ static void sh_mqtt_subscribe_handler(struct k_work *work)
if (rc == 0) {
/* Wait for mqtt's connack */
LOG_DBG("Listening to socket");
if (wait(CONNECT_TIMEOUT_MS)) {
rc = wait(CONNECT_TIMEOUT_MS);
if (rc > 0) {
LOG_DBG("Process socket for MQTT packet");
rc = mqtt_input(&sh_mqtt->mqtt_cli);
if (rc != 0) {
LOG_ERR("%s error: %d", "subscribe: mqtt_input", rc);
goto subscribe_error;
}
} else if (rc < 0) {
goto subscribe_error;
}
/* No suback, fail */
@ -399,13 +412,16 @@ static void sh_mqtt_connect_handler(struct k_work *work)
/* Wait for mqtt's connack */
LOG_DBG("Listening to socket");
if (wait(CONNECT_TIMEOUT_MS)) {
rc = wait(CONNECT_TIMEOUT_MS);
if (rc > 0) {
LOG_DBG("Process socket for MQTT packet");
rc = mqtt_input(&sh_mqtt->mqtt_cli);
if (rc != 0) {
LOG_ERR("%s error: %d", "connect: mqtt_input", rc);
goto connect_error;
}
} else if (rc < 0) {
goto connect_error;
}
/* No connack, fail */