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➜ Programming
➜ General
➜ fork'ing abort()
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| Posted by
| halkeye
Canada (28 posts) Bio
|
| Date
| Wed 24 Dec 2003 12:32 AM (UTC) Amended on Wed 24 Dec 2003 12:38 AM (UTC) by halkeye
|
| Message
| Been wondering about fork and abort.
if i fork a process, can i abort and dump a core of the parent?
I'm trying to do crash/segviolation handling, while that is farily easy with the copyover/hotboot code, but i would like to have any crashes dump a core file too.
I figure if i do:
if (fork())
{
abort();
} else {
// code
}
Or will that kill both things?
|
Gavin
Dark Warriors - Coder
http://darkwars.wolfpaw.net
telnet://darkwars.wolfpaw.net:4848 | | Top |
|
| Posted by
| Nick Gammon
Australia (23,173 posts) Bio
Forum Administrator |
| Date
| Reply #1 on Wed 24 Dec 2003 03:11 AM (UTC) |
| Message
| | Once you have forked you have two copies of the process. It is fine to abort one of them. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
|
| Posted by
| Nick Gammon
Australia (23,173 posts) Bio
Forum Administrator |
| Date
| Reply #2 on Wed 24 Dec 2003 03:14 AM (UTC) |
| Message
| Anyway, write a 11-line test program and see for yourself ...
int main (void)
{
if (fork())
{
printf ("This process is aborting...\n");
abort();
}
else
{
printf ("This process is still working...\n");
}
return 0;
} // end of main
You probably need a couple of include files, but that is the general idea. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
|
| Posted by
| halkeye
Canada (28 posts) Bio
|
| Date
| Reply #3 on Wed 24 Dec 2003 04:35 AM (UTC) Amended on Wed 24 Dec 2003 04:36 AM (UTC) by halkeye
|
| Message
| While i should have thought to actually try it, it just slipped my mind.
After reading many man pages on signals and fork and such, i thought i remebered being told that a child process will not handle singals.
I know there has to be a way, as daemons use fork(), but still handle singals.
Here is the code i'm currently trying, though it doesn't work.
/* signal( SIGPIPE, SIG_DFL );
signal( SIGSEGV, SIG_DFL );
signal( SIGTERM, SIG_DFL ); */
if (fork())
{
abort();
}
else
{
signal( SIGPIPE, SIG_IGN );
signal( SIGSEGV, SegVio );
signal( SIGTERM, SigTerm );
/* hotboot - Do Recovery Here */
}
I'm sure i'm missing something blatently obvious...
I think it has todo with the fact that the parent no longer exists. |
Gavin
Dark Warriors - Coder
http://darkwars.wolfpaw.net
telnet://darkwars.wolfpaw.net:4848 | | Top |
|
| Posted by
| halkeye
Canada (28 posts) Bio
|
| Date
| Reply #4 on Wed 24 Dec 2003 05:50 AM (UTC) |
| Message
| dude, i'm dumb. It works, just i'm unable to send kill signals to it.
at least it appears to work.
|
Gavin
Dark Warriors - Coder
http://darkwars.wolfpaw.net
telnet://darkwars.wolfpaw.net:4848 | | Top |
|
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