int syslog_dev_channel(void)
{
int ret;
/* Initialize the character driver interface */
ret = syslog_dev_initialize(CONFIG_SYSLOG_DEVPATH, OPEN_FLAGS, OPEN_MODE);
if (ret < 0)
{
return ret;
}
/* Use the character driver as the SYSLOG channel */
return syslog_channel(&g_syslog_dev_channel);
}
int syslog_console_channel(void)
{
int ret;
/* Initialize the character driver interface */
ret = syslog_dev_initialize("/dev/console", OPEN_FLAGS, OPEN_MODE);
if (ret < 0)
{
return ret;
}
/* Use the character driver as the SYSLOG channel */
return syslog_channel(&g_syslog_console_channel);
}
static int syslog_dev_outputready(void)
{
int ret;
/* Cases (4) and (5) */
if (up_interrupt_context() || getpid() == 0)
{
return -ENOSYS;
}
/* We can save checks in the usual case: That after the SYSLOG device
* has been successfully opened.
*/
if (g_syslog_dev.sl_state != SYSLOG_OPENED)
{
/* Case (1) and (2) */
if (g_syslog_dev.sl_state == SYSLOG_UNINITIALIZED ||
g_syslog_dev.sl_state == SYSLOG_INITIALIZING)
{
return -EAGAIN; /* Can't access the SYSLOG now... maybe next time? */
}
/* Case (6) */
if (g_syslog_dev.sl_state == SYSLOG_FAILURE)
{
return -ENXIO; /* There is no SYSLOG device */
}
/* syslog_dev_initialize() is called as soon as enough of the operating
* system is in place to support the open operation... but it is
* possible that the SYSLOG device is not yet registered at that time.
* In this case, we know that the system is sufficiently initialized
* to support an attempt to re-open the SYSLOG device.
*
* NOTE that the scheduler is locked. That is because we do not have
* fully initialized semaphore capability until the SYSLOG device is
* successfully initialized
*/
sched_lock();
if (g_syslog_dev.sl_state == SYSLOG_REOPEN)
{
/* Try again to initialize the device. We may do this repeatedly
* because the log device might be something that was not ready
* the first time that syslog_dev_initializee() was called (such as a
* USB serial device that has not yet been connected or a file in
* an NFS mounted file system that has not yet been mounted).
*/
DEBUGASSERT(g_syslog_dev.sl_devpath != NULL);
ret = syslog_dev_initialize(g_syslog_dev.sl_devpath,
(int)g_syslog_dev.sl_oflags,
(int)g_syslog_dev.sl_mode);
if (ret < 0)
{
sched_unlock();
return ret;
}
}
sched_unlock();
DEBUGASSERT(g_syslog_dev.sl_state == SYSLOG_OPENED);
}
return OK;
}