/**
* Exit regulary on a specific signal.
* This is good for profiling which only works if exited regularly
* and not by default signal handlers
* \param signo The signal that should be handled
*/
static void sig_usr(int signo)
{
int status;
pid_t pid;
UNUSED(pid);
if (is_main){
if (sig_flag==0) sig_flag=signo;
else /* previous sig. not processed yet, ignoring? */
return; ;
if (dont_fork)
/* only one proc, doing everything from the sig handler,
unsafe, but this is only for debugging mode*/
handle_sigs();
}else{
/* process the important signals */
switch(signo){
case SIGPIPE:
LM_INFO("signal %d received\n", signo);
break;
case SIGINT:
case SIGTERM:
LM_INFO("signal %d received\n", signo);
/* print memory stats for non-main too */
#ifdef PKG_MALLOC
LM_GEN1(memdump, "Memory status (pkg):\n");
pkg_status();
#endif
exit(0);
break;
case SIGUSR1:
/* statistics -> show only pkg mem */
#ifdef PKG_MALLOC
LM_GEN1(memdump, "Memory status (pkg):\n");
pkg_status();
#endif
break;
case SIGUSR2:
#ifdef PKG_MALLOC
set_pkg_stats( get_pkg_status_holder(process_no) );
#endif
break;
case SIGHUP:
/* ignored*/
break;
case SIGCHLD:
pid = waitpid(-1, &status, WNOHANG);
LM_DBG("SIGCHLD received from %ld (status=%d), ignoring\n",
(long)pid,status);
}
}
}
/**
* Signal handler for the server.
*/
void handle_sigs(void)
{
pid_t chld;
int chld_status;
int i;
int do_exit;
const unsigned int shutdown_time = 60; /* one minute close timeout */
switch(sig_flag){
case 0: break; /* do nothing*/
case SIGPIPE:
/* SIGPIPE might be rarely received on use of
exec module; simply ignore it
*/
LM_WARN("SIGPIPE received and ignored\n");
break;
case SIGINT:
case SIGTERM:
/* we end the program in all these cases */
if (sig_flag==SIGINT)
LM_DBG("INT received, program terminates\n");
else
LM_DBG("SIGTERM received, program terminates\n");
/* first of all, kill the children also */
kill_all_children(SIGTERM);
if (signal(SIGALRM, sig_alarm_kill) == SIG_ERR ) {
LM_ERR("could not install SIGALARM handler\n");
/* continue, the process will die anyway if no
* alarm is installed which is exactly what we want */
}
alarm(shutdown_time);
while(wait(0) > 0); /* Wait for all the children to terminate */
signal(SIGALRM, sig_alarm_abort);
cleanup(1); /* cleanup & show status*/
alarm(0);
signal(SIGALRM, SIG_IGN);
dprint("Thank you for flying " NAME "\n");
exit(0);
break;
case SIGUSR1:
#ifdef PKG_MALLOC
LM_GEN1(memdump, "Memory status (pkg):\n");
pkg_status();
#endif
#ifdef SHM_MEM
LM_GEN1(memdump, "Memory status (shm):\n");
shm_status();
#endif
break;
case SIGUSR2:
#ifdef PKG_MALLOC
set_pkg_stats( get_pkg_status_holder(process_no) );
#endif
break;
case SIGCHLD:
do_exit = 0;
while ((chld=waitpid( -1, &chld_status, WNOHANG ))>0) {
/* is it a process we know about? */
for( i=0 ; i<counted_processes ; i++ )
if (pt[i].pid==chld) break;
if (i==counted_processes) {
LM_DBG("unkown child process %d ended. Ignoring\n",chld);
continue;
}
do_exit = 1;
/* process the signal */
if (WIFEXITED(chld_status))
LM_INFO("child process %d exited normally,"
" status=%d\n", chld,
WEXITSTATUS(chld_status));
else if (WIFSIGNALED(chld_status)) {
LM_INFO("child process %d exited by a signal"
" %d\n", chld, WTERMSIG(chld_status));
#ifdef WCOREDUMP
LM_INFO("core was %sgenerated\n",
WCOREDUMP(chld_status) ? "" : "not " );
#endif
}else if (WIFSTOPPED(chld_status))
LM_INFO("child process %d stopped by a"
" signal %d\n", chld,
WSTOPSIG(chld_status));
}
if (!do_exit)
break;
LM_INFO("terminating due to SIGCHLD\n");
/* exit */
kill_all_children(SIGTERM);
if (signal(SIGALRM, sig_alarm_kill) == SIG_ERR ) {
LM_ERR("could not install SIGALARM handler\n");
/* continue, the process will die anyway if no
* alarm is installed which is exactly what we want */
}
alarm(shutdown_time);
while(wait(0) > 0); /* wait for all the children to terminate*/
signal(SIGALRM, sig_alarm_abort);
cleanup(1); /* cleanup & show status*/
alarm(0);
signal(SIGALRM, SIG_IGN);
LM_DBG("terminating due to SIGCHLD\n");
exit(0);
break;
case SIGHUP: /* ignoring it*/
LM_DBG("SIGHUP received, ignoring it\n");
break;
default:
LM_CRIT("unhandled signal %d\n", sig_flag);
}
sig_flag=0;
}
