handling termination in a FastCGI
Basile STARYNKEVITCH <[email protected]>
| Newsgroups | gmane.comp.web.fastcgi.devel |
|---|---|
| Message-ID | <[email protected]> |
Dear All,
I don't really understand how to handle graceful termination with a
FastCGI (running under Debian/Sid Apache2.0.55 mod_fcgid)
Here is my code fragment (I removed includes). Yes I do know that
calling syslog from a signal handler is unsafe, but in practice it
is called.
################################################################
volatile int barkpp_again;
static void sigterm_handler(int sig) {
barkpp_again = 0;
syslog(LOG_INFO, "inside sigterm handler");
}
int main(int argc, char** argv) {
int count=0;
FCGX_Stream *in, *out, *err;
FCGX_ParamArray envp;
barkpp_again = 1;
openlog("barkpp-FCGI", LOG_CONS|LOG_NDELAY|LOG_PID, LOG_LOCAL2);
syslog(LOG_INFO, "* barkpp pid %d starting compiled " __DATE__ ";" __TIME__ "\n", (int) getpid());
signal(SIGTERM, sigterm_handler);
while(barkpp_again && FCGX_Accept(&in, &out, &err, &envp) >= 0) {
FCGX_FPrintF(out,
"Content-type: text/html\r\n"
"\r\n"
"<html><head><title>test barkcpp</title></head>\n"
"<body><h1>barkcpp test</h1>\n"
"<p> pid %d counter %d <small>" __DATE__ " " __TIME__ "</small></p>\n"
"</body></html>\n",
(int)getpid(), ++count);
}
syslog(LOG_INFO, "* barkpp pid %d terminating\n", (int)getpid());
return 0;
}
################################################################
My browser behave as expected.
In /var/log/apache2/error.log
[Tue Apr 04 19:33:54 2006] [notice] mod_fcgid: server /var/www/BARKPP/barkpp.fcgi(13418) started
[Tue Apr 04 19:39:21 2006] [notice] mod_fcgid: process 13418 going graceful shutdown, sending SIGTERM
[Tue Apr 04 19:39:27 2006] [warn] mod_fcgid: process 13418 graceful shutdown timeouted, sending SIGKILL
[Tue Apr 04 19:39:33 2006] [notice] mod_fcgid: process /var/www/BARKPP/barkpp.fcgi(13418) exit(idle timeout), get stop signal 9
In /var/log/messages In only have
Apr 4 19:33:54 hector barkpp-FCGI[13418]: * barkpp pid 13418 starting compiled Apr 4 2006;19:19:31
Apr 4 19:39:21 hector barkpp-FCGI[13418]: inside sigterm handler
Why is my program not exiting the loop properly? I am expecting that
the SIGTERM signal sent by Apache would interrupt FCGX_Accept, clear
barkpp_again (in the called sigterm handler), and exit the loop
properly. But this is not the case, the sigterm handler is called but
the terminating syslog is never called, as if there is some loop
withing FCGX_Accept?
Does FCGX_Accept enter some internal poll or select system call?
How do you handle properly termination? The intent would be to save
persistent FCGI process state in its termination routine....
Regards.
--
Basile STARYNKEVITCH http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net
aliases: basile<at>tunes<dot>org = bstarynk<at>nerim<dot>net
8, rue de la Faïencerie, 92340 Bourg La Reine, France
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