Date: Mon, 17 Jul 1995 09:21:44 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-hackers@freebsd.org (FreeBSD hackers) Cc: filo@yahoo.com Subject: Re: Ignoring SIGCHLD without having to wait()? Message-ID: <199507170721.JAA05076@uriah.heep.sax.de> In-Reply-To: <9507170445.AA18374@cs.weber.edu> from "Terry Lambert" at Jul 16, 95 10:45:38 pm
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As Terry Lambert wrote:
>
> I believe that the "ignore" is supposed to work: that is, it will cause
> the exit status to be automatically reaped. That is, _exit will check
> the mask on the parent process and react accordingly.
Huh?
j@uriah 88% cat foo.c
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <signal.h>
int main(void) {
pid_t pid;
int i;
signal(SIGCHLD, SIG_IGN);
for(i = 0; i < 20; i++) {
if((pid = fork()) == 0) {
return 0;
}
}
sleep(100);
return 0;
}
j@uriah 89% cc foo.c
j@uriah 90% ./a.out &
[2] 5031
j@uriah 91% ps
PID TT STAT TIME COMMAND
...
5031 a1 S 0:00.10 ./a.out
5032 a1 Z 0:00.00 (a.out)
5033 a1 Z 0:00.00 (a.out)
5034 a1 Z 0:00.00 (a.out)
5035 a1 Z 0:00.00 (a.out)
5036 a1 Z 0:00.00 (a.out)
5037 a1 Z 0:00.00 (a.out)
5038 a1 Z 0:00.00 (a.out)
5039 a1 Z 0:00.00 (a.out)
5040 a1 Z 0:00.00 (a.out)
5041 a1 Z 0:00.00 (a.out)
5042 a1 Z 0:00.00 (a.out)
5043 a1 Z 0:00.00 (a.out)
5044 a1 Z 0:00.00 (a.out)
5045 a1 Z 0:00.00 (a.out)
5046 a1 Z 0:00.00 (a.out)
5047 a1 Z 0:00.00 (a.out)
5048 a1 Z 0:00.00 (a.out)
5049 a1 Z 0:00.00 (a.out)
5050 a1 Z 0:00.00 (a.out)
5051 a1 Z 0:00.00 (a.out)
j@uriah 92% kill %2
[2] Terminated ./a.out
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)
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