/******************************************************************************
* *
* Function: terminate_signal_handler *
* *
* Purpose: handle terminate signals: SIGQUIT, SIGINT, SIGTERM *
* *
******************************************************************************/
static void terminate_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
SIG_CHECK_PARAMS(sig, siginfo, context);
if (!SIG_PARENT_PROCESS)
{
zabbix_log(sig_parent_pid == SIG_CHECKED_FIELD(siginfo, si_pid) ?
LOG_LEVEL_DEBUG : LOG_LEVEL_WARNING,
"Got signal [signal:%d(%s),sender_pid:%d,sender_uid:%d,"
"reason:%d]. Exiting ...",
sig, get_signal_name(sig),
SIG_CHECKED_FIELD(siginfo, si_pid),
SIG_CHECKED_FIELD(siginfo, si_uid),
SIG_CHECKED_FIELD(siginfo, si_code));
exit(FAIL);
}
else
{
if (0 == sig_exiting)
{
sig_exiting = 1;
zabbix_log(sig_parent_pid == SIG_CHECKED_FIELD(siginfo, si_pid) ?
LOG_LEVEL_DEBUG : LOG_LEVEL_WARNING,
"Got signal [signal:%d(%s),sender_pid:%d,sender_uid:%d,"
"reason:%d]. Exiting ...",
sig, get_signal_name(sig),
SIG_CHECKED_FIELD(siginfo, si_pid),
SIG_CHECKED_FIELD(siginfo, si_uid),
SIG_CHECKED_FIELD(siginfo, si_code));
zbx_on_exit();
}
}
}
/******************************************************************************
* *
* Function: pipe_signal_handler *
* *
* Purpose: handle pipe signal SIGPIPE *
* *
******************************************************************************/
static void pipe_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
SIG_CHECK_PARAMS(sig, siginfo, context);
zabbix_log(LOG_LEVEL_DEBUG, "Got signal [signal:%d(%s),sender_pid:%d]. Ignoring ...",
sig, get_signal_name(sig),
SIG_CHECKED_FIELD(siginfo, si_pid));
}
/******************************************************************************
* *
* Function: fatal_signal_handler *
* *
* Purpose: handle fatal signals: SIGILL, SIGILL, SIGSEGV, SIGBUS *
* *
******************************************************************************/
static void fatal_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
SIG_CHECK_PARAMS(sig, siginfo, context);
zabbix_log(LOG_LEVEL_CRIT, "Got signal [signal:%d(%s),reason:%d,refaddr:%p]. Crashing ...",
sig, get_signal_name(sig),
SIG_CHECKED_FIELD(siginfo, si_code),
SIG_CHECKED_FIELD_TYPE(siginfo, si_addr, void *));
print_fatal_info(sig, siginfo, context);
exit(FAIL);
}
/******************************************************************************
* *
* Function: user1_signal_handler *
* *
* Purpose: handle user signal SIGUSR1 *
* *
******************************************************************************/
static void user1_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
#ifdef HAVE_SIGQUEUE
int flags;
#endif
SIG_CHECK_PARAMS(sig, siginfo, context);
zabbix_log(LOG_LEVEL_DEBUG, "Got signal [signal:%d(%s),sender_pid:%d,sender_uid:%d,value_int:%d(0x%08x)].",
sig, get_signal_name(sig),
SIG_CHECKED_FIELD(siginfo, si_pid),
SIG_CHECKED_FIELD(siginfo, si_uid),
SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT),
(unsigned int)SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT));
#ifdef HAVE_SIGQUEUE
flags = SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT);
if (!SIG_PARENT_PROCESS)
{
common_sigusr_handler(flags);
return;
}
if (NULL == threads)
{
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal: shutdown in progress");
return;
}
switch (ZBX_RTC_GET_MSG(flags))
{
case ZBX_RTC_CONFIG_CACHE_RELOAD:
if (0 != (program_type & ZBX_PROGRAM_TYPE_PROXY_PASSIVE))
{
zabbix_log(LOG_LEVEL_WARNING, "forced reloading of the configuration cache"
" cannot be performed for a passive proxy");
return;
}
zbx_signal_process_by_type(ZBX_PROCESS_TYPE_CONFSYNCER, 1, flags);
break;
case ZBX_RTC_HOUSEKEEPER_EXECUTE:
zbx_signal_process_by_type(ZBX_PROCESS_TYPE_HOUSEKEEPER, 1, flags);
break;
case ZBX_RTC_LOG_LEVEL_INCREASE:
case ZBX_RTC_LOG_LEVEL_DECREASE:
if ((ZBX_RTC_LOG_SCOPE_FLAG | ZBX_RTC_LOG_SCOPE_PID) == ZBX_RTC_GET_SCOPE(flags))
zbx_signal_process_by_pid(ZBX_RTC_GET_DATA(flags), flags);
else
zbx_signal_process_by_type(ZBX_RTC_GET_SCOPE(flags), ZBX_RTC_GET_DATA(flags), flags);
break;
}
#endif
}
/******************************************************************************
* *
* Function: child_signal_handler *
* *
* Purpose: handle child signal SIGCHLD *
* *
******************************************************************************/
static void child_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
SIG_CHECK_PARAMS(sig, siginfo, context);
if (!SIG_PARENT_PROCESS)
exit(FAIL);
if (0 == sig_exiting)
{
sig_exiting = 1;
zabbix_log(LOG_LEVEL_CRIT, "One child process died (PID:%d,exitcode/signal:%d). Exiting ...",
SIG_CHECKED_FIELD(siginfo, si_pid), SIG_CHECKED_FIELD(siginfo, si_status));
zbx_on_exit();
}
}
/******************************************************************************
* *
* Function: user1_signal_handler *
* *
* Purpose: handle user signal SIGUSR1 *
* *
******************************************************************************/
static void user1_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
SIG_CHECK_PARAMS(sig, siginfo, context);
zabbix_log(LOG_LEVEL_DEBUG, "Got signal [signal:%d(%s),sender_pid:%d,sender_uid:%d,value_int:%d].",
sig, get_signal_name(sig),
SIG_CHECKED_FIELD(siginfo, si_pid),
SIG_CHECKED_FIELD(siginfo, si_uid),
SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT));
#ifdef HAVE_SIGQUEUE
if (!SIG_PARENT_PROCESS)
{
extern void zbx_sigusr_handler(zbx_task_t task);
zbx_sigusr_handler(SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT));
}
else if (ZBX_TASK_CONFIG_CACHE_RELOAD == SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT))
{
extern unsigned char daemon_type;
if (0 != (daemon_type & ZBX_DAEMON_TYPE_PROXY_PASSIVE))
{
zabbix_log(LOG_LEVEL_WARNING, "forced reloading of the configuration cache"
" cannot be performed for a passive proxy");
}
else
{
union sigval s;
extern pid_t *threads;
s.ZBX_SIVAL_INT = ZBX_TASK_CONFIG_CACHE_RELOAD;
/* threads[0] is configuration syncer (it is set in proxy.c and server.c) */
if (NULL != threads && -1 != sigqueue(threads[0], SIGUSR1, s))
{
zabbix_log(LOG_LEVEL_DEBUG, "the signal is redirected to"
" the configuration syncer");
}
else
{
zabbix_log(LOG_LEVEL_ERR, "failed to redirect signal: %s",
zbx_strerror(errno));
}
}
}
#endif
}
/******************************************************************************
* *
* Function: user1_signal_handler *
* *
* Purpose: handle user signal SIGUSR1 *
* *
******************************************************************************/
static void user1_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
#ifdef HAVE_SIGQUEUE
int flags, process_num, found = 0, i;
union sigval s;
unsigned char process_type;
#endif
SIG_CHECK_PARAMS(sig, siginfo, context);
zabbix_log(LOG_LEVEL_DEBUG, "Got signal [signal:%d(%s),sender_pid:%d,sender_uid:%d,value_int:%d(0x%08x)].",
sig, get_signal_name(sig),
SIG_CHECKED_FIELD(siginfo, si_pid),
SIG_CHECKED_FIELD(siginfo, si_uid),
SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT),
SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT));
#ifdef HAVE_SIGQUEUE
flags = SIG_CHECKED_FIELD(siginfo, si_value.ZBX_SIVAL_INT);
if (!SIG_PARENT_PROCESS)
{
common_sigusr_handler(flags);
}
else if (NULL == threads)
{
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal: shutdown in progress");
}
else if (ZBX_RTC_CONFIG_CACHE_RELOAD == ZBX_RTC_GET_MSG(flags))
{
extern unsigned char daemon_type;
if (0 != (daemon_type & ZBX_DAEMON_TYPE_PROXY_PASSIVE))
{
zabbix_log(LOG_LEVEL_WARNING, "forced reloading of the configuration cache"
" cannot be performed for a passive proxy");
return;
}
for (i = 0; i < threads_num; i++)
{
if (FAIL == get_process_info_by_thread(i + 1, &process_type, &process_num))
continue;
if (ZBX_PROCESS_TYPE_CONFSYNCER == process_type)
break;
}
if (i != threads_num)
{
s.ZBX_SIVAL_INT = flags;
if (-1 != sigqueue(threads[i], SIGUSR1, s))
zabbix_log(LOG_LEVEL_DEBUG, "the signal was redirected to the configuration syncer");
else
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal: %s", zbx_strerror(errno));
}
else
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal to configuration syncer: process not found");
}
else if (ZBX_RTC_LOG_LEVEL_INCREASE == ZBX_RTC_GET_MSG(flags) ||
ZBX_RTC_LOG_LEVEL_DECREASE == ZBX_RTC_GET_MSG(flags))
{
s.ZBX_SIVAL_INT = flags;
if ((ZBX_RTC_LOG_SCOPE_FLAG | ZBX_RTC_LOG_SCOPE_PID) == ZBX_RTC_GET_SCOPE(flags))
{
for (i = 0; i < threads_num; i++)
{
if (0 != ZBX_RTC_GET_DATA(flags) && threads[i] != ZBX_RTC_GET_DATA(flags))
continue;
found = 1;
if (-1 != sigqueue(threads[i], SIGUSR1, s))
{
zabbix_log(LOG_LEVEL_DEBUG, "the signal was redirected to process pid:%d",
threads[i]);
}
else
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal: %s", zbx_strerror(errno));
}
if (0 != ZBX_RTC_GET_DATA(flags) && 0 == found)
{
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal: process pid:%d is not a Zabbix child"
" process", ZBX_RTC_GET_DATA(flags));
}
}
else
{
for (i = 0; i < threads_num; i++)
{
if (FAIL == get_process_info_by_thread(i + 1, &process_type, &process_num))
break;
if (ZBX_RTC_GET_SCOPE(flags) != process_type)
{
/* check if we have already checked processes of target type */
if (1 == found)
break;
continue;
}
if (0 != ZBX_RTC_GET_DATA(flags) && ZBX_RTC_GET_DATA(flags) != process_num)
continue;
found = 1;
if (-1 != sigqueue(threads[i], SIGUSR1, s))
{
zabbix_log(LOG_LEVEL_DEBUG, "the signal was redirected to \"%s\" process"
" pid:%d", get_process_type_string(process_type), threads[i]);
}
else
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal: %s", zbx_strerror(errno));
}
if (0 == found)
{
if (0 == ZBX_RTC_GET_DATA(flags))
{
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal:"
" \"%s\" process does not exist",
get_process_type_string(ZBX_RTC_GET_SCOPE(flags)));
}
else
{
zabbix_log(LOG_LEVEL_ERR, "cannot redirect signal:"
" \"%s #%d\" process does not exist",
get_process_type_string(ZBX_RTC_GET_SCOPE(flags)),
ZBX_RTC_GET_DATA(flags));
}
}
}
}
#endif
}
/******************************************************************************
* *
* Function: alarm_signal_handler *
* *
* Purpose: handle alarm signal SIGALRM *
* *
******************************************************************************/
static void alarm_signal_handler(int sig, siginfo_t *siginfo, void *context)
{
SIG_CHECK_PARAMS(sig, siginfo, context);
}
