xiaoxiang781216 commented on a change in pull request #3050:
URL: https://github.com/apache/incubator-nuttx/pull/3050#discussion_r599643976
##########
File path: drivers/syslog/syslog_channel.c
##########
@@ -135,14 +139,82 @@ static int syslog_default_putc(int ch)
int syslog_channel(FAR const struct syslog_channel_s *channel)
{
+#if (CONFIG_SYSLOG_MAX_CHANNELS != 1)
+ int i;
+#endif
+
DEBUGASSERT(channel != NULL);
if (channel != NULL)
{
DEBUGASSERT(channel->sc_putc != NULL && channel->sc_force != NULL);
- g_syslog_channel = channel;
+#if (CONFIG_SYSLOG_MAX_CHANNELS == 1)
+ g_syslog_channel[0] = channel;
return OK;
+#else
+ for (i = 0; i < CONFIG_SYSLOG_MAX_CHANNELS; i++)
+ {
+ if (g_syslog_channel[i] == NULL)
+ {
+ g_syslog_channel[i] = channel;
+ return OK;
+ }
+ else if (g_syslog_channel[i] == channel)
+ {
+ return OK;
+ }
+ }
+#endif
+ }
+
+ return -EINVAL;
+}
+
+/****************************************************************************
+ * Name: syslog_channel_remove
+ *
+ * Description:
+ * Removes an already configured SYSLOG channel from the list of used
+ * channels.
+ *
+ * Input Parameters:
+ * channel - Provides the interface to the channel to be removed.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success. A negated errno value is returned
+ * on any failure.
+ *
+ ****************************************************************************/
+
+int syslog_channel_remove(FAR const struct syslog_channel_s *channel)
Review comment:
There are two stream(emerge v.s. syslog):
```
if (priority == LOG_EMERG)
{
/* Use the SYSLOG emergency stream */
emergstream(&stream.public);
}
else
{
/* Use the normal SYSLOG stream */
syslogstream_create(&stream);
}
```
The first(emerge) call syslog_force directly, the second(syslog) save the
result into iob buffer and flush through syslog_write at the end.
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