Re: [Fwd: sigcontext on Linux-ppc in user space]

[jekacur@ca.ibm.com]

Ok, actually the segfault was for a more complicated function, but the
simplified example still gives the wrong answer. i.e scp should point to a
struct sigcontext and scp->signal should be 10 in the sample program.

John Kacur/Toronto/IBM@IBMCA
jekacur@ca.ibm.com
(416) 448-2584 (phone)
778-2584 (tie line)


"Kevin B. Hendricks" <khendricks@ivey.uwo.ca> on 01/25/2001 01:10:40 PM

Please respond to khendricks@ivey.uwo.ca

To:   John Kacur/Toronto/IBM@IBMCA
cc:   linux-kernel@vger.kernel.org, linuxppc-dev@lists.linuxppc.org
Subject:  Re: [Fwd: sigcontext on Linux-ppc in user space]


Hi,

Here is what I get from running it on my system (ppc linux with 2.2.15
kernel with some mods and glibc-2.1.3).

But no segfault.

Kevin


[kbhend@localhost ~]$ gcc -O2 -ojunk junk.c
[kbhend@localhost ~]$ ./junk
SIGUSR1 = 10
scp = 7fffe9a4
scp->signal = 0
[kbhend@localhost ~]$




On Thursday, January 25, 2001, at 10:09 AM, jekacur@ca.ibm.com wrote:

> #include <stdio.h>
> #include <signal.h>
>
> /* Function Prototypes */
> void install_sigusr1_handler(void);
> void sigusr_handler(int , siginfo_t *, struct sigcontext * scp);
>
> int main(void)
> {
>         install_sigusr1_handler();
>         printf("SIGUSR1 = %d\n", SIGUSR1);
>         raise(SIGUSR1);
>         exit(0);
> }
>
> void install_sigusr1_handler(void)
> {
>         struct sigaction newAct;
>
>         if (sigemptyset(&newAct.sa_mask) != 0) {
>                 fprintf(stderr, "Warning, sigemptyset failed.\n");
>         }
>
>         newAct.sa_flags = 0;
>         newAct.sa_flags |= SA_SIGINFO | SA_RESTART;
>
>         newAct.sa_sigaction = (void
> (*)(int,siginfo_t*,void*))sigusr_handler;
>
>         if (sigaction(SIGUSR1, &newAct, NULL) != 0) {
>                 fprintf(stderr, "Couldn't install SIGUSR1 handler.\n");
>                 fprintf(stderr, "Exiting.\n");
>                 exit(1);
>         }
> }
>
> void sigusr_handler(int signo, siginfo_t *siginfp, struct sigcontext *
scp)
> {
>         printf("scp = %08x\n", scp);
>         printf("scp->signal = %d\n", scp->signal);
> }
>
>




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