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Philip Hazel wrote:
> > It doesn't write its pid there.
> > It is not writeable for root, but this shouldn't be a problem,
> > or could it?
> Yes, is could. The Exim daemon writes its pid file while it is still
> root, because on some systems, all the pid files for all the daemons are
> kept in the same directory (/var/pids or something), which is only
> accessible by root.
but root normally does not get disturbed by the fact that a directory
is not writable for root. so i thougt, why bother?
> To track down the crashing problem, I think you will have to add more
> debugging lines to the daemon.c module, to find out exactly where it is
> crashing. The function of interest is called debug_go(), and starts
> around line 656. If you insert lines like
did that. here's the result:
---------------
root:~/exim4/exim-4.20# /usr/local/exim/bin/exim -d -bd
Exim version 4.20 uid=0 gid=0 pid=2135 D=fbb95cfd
Berkeley DB: Sleepycat Software: Berkeley DB 4.1.25: (December 19, 2002)
Support for:
Authenticators:
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mbx autoreply pipe smtp
changed uid/gid: forcing real = effective
uid=0 gid=0 pid=2135
auxiliary group list: <none>
configuration file is /usr/local/exim/configure
log selector = 020d99d8
trusted user
admin user
originator: uid=0 gid=0 login=root name=root
daemon_go: declares and inits done.
2135 daemon_go: debug_selector or'ed.
2135 daemon_go: if (background_daemon) finished.
2135 daemon_go: inside if (daemon_listen) block.
2135 daemon_go: os_getloadavg done.
Segmentation fault
----------------
here's my modified code:
debug_printf("daemon_go: os_getloadavg done.\n");
/* Find the standard SMTP port if no port number given; convert it to host
order. */
if (default_smtp_port < 0)
{
struct servent *smtp_service;
smtp_service = getservbyname("smtp", "tcp");
debug_printf("getservbyname done.\n");
if (smtp_service == NULL)
{
debug_printf("about to log_write: cannot find smtp service\n");
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot find smtp/tcp service "
"when starting daemon");
}
default_smtp_port = ntohs(smtp_service->s_port);
}
debug_printf("daemon_go: if (default_smtp_port < 0) done.\n");
So the problem must be caused by the system's lookup function
getservbyname, right?
However, the following code compiles and runs correctly:
#include <netdb.h>
#include <stdio.h>
int main(void)
{
struct servent* srvent;
srvent = getservbyname("smtp", "tcp");
printf("official name: %s\nport number: %d\nprotocol: %s\n",
srvent->s_name, srvent->s_port, srvent->s_proto);
return 0;
}
I'm clueless.
By the way, thanks a lot for your pointers, Philip and Tony.
regards,
dominik
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