unable to receive SIGTERM, SIGHUP with apr_signal

Prashant Keshvani <prashant.keshvani@xxxxxxxxxxxxxx> · Tue, 02 Jun 2009 17:43:24 +0530

Dear all,

I am trying to modify the code of mod_dumpit.c . I want to dump all 

request response to

separate file, then error log. For performance reason, I have opened file
with APR_BUFFERED flag, while calling apr_file_open.

The problem is, when i use buffered flag, and shuts down my httpd, the 

contents

of the buffer is not getting transfered to file, even though i have used 

apr_file_open

. So i decided to register a function, which flushes the file, using 

apr_file_flush

and register that function for signals, SIGHUP, SIGTERM and SIGUSR1.
but my signal handler is not called, when we reload the httpd. So i have
decided to call apr_pool_cleanup_register, and register apr_file_flush
when pool is cleaned up. But unfortunately it didn't work.
below is the code . can anybody please help.

static void mercedumpio_register_hooks(apr_pool_t *p)
{

/*
* We know that SSL is CONNECTION + 5
*/
 ap_register_output_filter("DUMPIO_OUT", mercedumpio_output_filter,
       NULL, AP_FTYPE_CONNECTION + 3) ;

 ap_register_input_filter("DUMPIO_IN", mercedumpio_input_filter,
       NULL, AP_FTYPE_CONNECTION + 3) ;

 ap_hook_pre_connection(mercedumpio_pre_conn, NULL, NULL, APR_HOOK_MIDDLE);

   apr_signal(SIGHUP, sighandler);
   apr_signal(SIGTERM, sighandler);
   apr_signal(SIGUSR1, sighandler);
   //apr_signal(AP_SIG_GRACEFUL, sighandler);
   //apr_signal(AP_SIG_GRACEFUL_STOP, sighandler);

   char foo[100];
   int x;
   x = getpid();
   sprintf(foo, "/var/tmp/foo%d", x);
   apr_status_t rv;

   rv = apr_file_open(&fp, foo, APR_CREATE | APR_WRITE | APR_APPEND | 

APR_BUFFERED  , APR_OS_DEFAULT, p);

   apr_pool_cleanup_register(p,fp, apr_file_flush, apr_pool_cleanup_null);
   if (rv != APR_SUCCESS) {
       //ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
       //      "could not open transfer log file %s.", fname);
   //  return NULL;
}

Warm Regards and thanks in advance,
Prashant R Keshvani
Merce Technologies.

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