Mail Archives: cygwin/2004/03/24/11:43:05
On Wed, Mar 24, 2004 at 08:24:34PM +0000, Ghanshyam wrote:
>Hi all,
>
>I found some problem in sigaction() system call with respect to following
>assertions defined in IEEE std 2003.1 -1992 Test methods for measuring
>conformance to POSIX-part1 document: When I run NIST-PCTS test suite on
>cygwin the following assertion failed.
>
>14(C) If the behavior associated with {_POSIX_JOB_CONTROL} is supported:
> When sig is SIGCHLD and the SA_NOCLDSTOP flag is set in sa_flags, then a
> call to sigaction(sig, act, oact) results in a SIGCHLD signal not
> being generated for the parent process whenever any of its child
> processes stop.
>
>********** SIGCHLD signal received by parent process when SIGSTOP signal
>is send to child process!
I have employed a patented method that I have devised called "a simple
test case" to determine if your claim is true or not.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
void
ouch (int sig)
{
printf ("ouch %d\n", sig);
}
int
main (int argc, char **argv)
{
struct sigaction newact = {0};
struct sigaction oldact;
int pid, x;
if (argc == 1)
newact.sa_flags = SA_NOCLDSTOP;
newact.sa_handler = ouch;
printf ("%d = sigaction\n", sigaction (SIGCHLD, &newact, &oldact));
if ((pid = fork ()) > 0)
kill (pid, SIGSTOP);
else
{
sleep (5);
sleep (1);
puts ("exiting child\n");
exit (0);
}
sleep (1);
kill (pid, SIGCONT);
wait (&x);
puts ("exiting parent");
}
Compiling the above program as "sigstopchld" and running it provides:
m:\test>.\sigstopchld # Calling with SA_NOCLDSTOP
0 = sigaction
exiting child
ouch 20 # Just one SIGCHLD from child exit
exiting parent
m:\test>.\sigstopchld 1 # SA_NOCLDSTOP not set
0 = sigaction
ouch 20 # first SIGCHLD
exiting child
ouch 20 # second SIGCHLD
exiting parent
This indicates to me that SA_NOCLDSTOP is working as designed.
--
Christopher Faylor spammer? -> aaaspam AT sourceware DOT org
Cygwin Project Leader
Red Hat, Inc.
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