[99] in Pthreads mailing list archive
Re: sigsuspend?
daemon@ATHENA.MIT.EDU (Christopher Provenzano)
Sun Aug 27 05:38:08 1995
To: jhahn@candy.snu.ac.kr (Jung-Ho Ahn)
Cc: pthreads@MIT.EDU
In-Reply-To: Your message of "Sat, 05 Aug 1995 10:39:40 +0900."
<9508050139.AA18468@candy.snu.ac.kr>
Date: Sun, 27 Aug 1995 05:20:50 EDT
From: Christopher Provenzano <proven@MIT.EDU>
> 'sigsuspend()' function doesn't seem to work well.
> the following program can't get a signal:
> #include <signal.h>
>
> void wakeup() { }
>
>
> main()
> {
> struct sigaction act;
> act.sa_handler = wakeup;
> sigemptyset(&act.sa_mask);
> act.sa_flags = 0;
> if ( sigaction(SIGUSR1, &act, 0) < 0 ) {
> perror("sigaction");
> exit(-1);
> }
>
> sigset_t zeromask;
>
> sigemptyset(&zeromask);
>
> if ( sigsuspend(&zeromask) != -1 ) {
> perror("sigsuspend");
> exit(-1);
> }
>
> printf("ok!\n");
>
> }
The problem is with sigaction(), which isn't implemented in beta3. I've
added a pthread_sigaction() for beta4, But to actually make is sigaction()
will require a bit of asm hacking.
>
> And also, sigprocmask() does not check whether the
> second arguemnt is NULL or not. so if it can't be
> used to examine the process's signal mask.
>
This will be fixed in beta4.
CAP
