[Eric Branlund <eric@msg.ucsf.edu>] libc/2381: on alpha, sigsuspenddoes not return -1 and set errno to EINTR

[Andreas Jaeger <aj at suse dot de>]

Hi AXP experts,

I can reproduce the problem on alpha (i386 is fine) running glibc 2.2.
Do you have any idea what's broken?

Thanks,
Andreas

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• Subject: Topics

Topics:
   libc/2381: on alpha, sigsuspend does not return -1 and set errno to EINTR

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• To: libc-gnats at gnu dot org, gnats-admin at gnu dot org
• Subject: libc/2381: on alpha, sigsuspend does not return -1 and set errno toEINTR
• From: Eric Branlund <eric at msg dot ucsf dot edu>
• Date: Mon, 09 Jul 2001 16:15:03 -0400

	Note: There was a bad value `' for the field `Class'.
	It was set to the default value of `sw-bug'.

	Note: There was a bad value `' for the field `Priority'.
	It was set to the default value of `medium'.

	Note: There was a bad value `' for the field `Severity'.
	It was set to the default value of `serious'.

>Number:         2381
>Category:       libc
>Synopsis:       On alpha, sigsuspend does not return -1 and set errno to EINTR.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    libc-gnats
>State:          open
>Quarter:        
>Keywords:       
>Class:          sw-bug
>Submitter-Id:   unknown
>Arrival-Date:   Mon Jul 09 16:15:02 -0400 2001
>Cases:          
>Originator:     Eric Branlund
>Release:        libc-2.1.3
>Organization:
 
>Environment:
ds10 with 600 MHz ev67 running RedHat 6.2
Host type: alpha-redhat-linux-gnu
System: Linux ds1032.msgnet 2.2.17 #1 Thu Feb 15 10:11:36 PST 2001 alpha
unknown
Architecture: alpha

Addons: c_stubs crypt glibc-compat linuxthreads
Build CFLAGS: -O3 -Wall -Winline -Wstrict-prototypes -Wwrite-strings -g
Build CC: egcs
Compiler version: egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
Kernel headers: 2.2.14-6.0
Symbol versioning: yes
Build static: yes
Build shared: yes
Build pic-default: no
Build profile: yes
Build omitfp: no
Build bounded: no
Build static-nss: no
Stdio: libio

>Description:
An application installs a signal handler via sigaction and waits
for a signal with sigsuspend.  When it receives a signal for which
it has a handler installed and sigsuspend returns, the return value
is not -1 and errno has not been set to EINTR.
>How-To-Repeat:
Assuming that the source code below is in test_suspend.c, then
these commands:

     sh
     gcc -Wall test_suspend.c
     ./a.out &
     kill -USR1 $!
     kill -INT $!

give this result:

     sigsuspend returns 111 and errno = 0

on the system to which I have access.

--------------------------------------------------------------------------

#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

static void handle_usr1(int sig);


int main(int argc, char* argv[])
{
    sigset_t mask, old_mask;
    struct sigaction sa;

    if (sigemptyset(&mask) != 0 ||
        sigaddset(&mask, SIGUSR1) != 0) {
        perror("sigemptyset");
        return EXIT_FAILURE;
    }
    if (sigemptyset(&sa.sa_mask) != 0) {
        perror("sigemptyset");
        return EXIT_FAILURE;
    }
    sa.sa_flags = 0;
    sa.sa_handler = handle_usr1;
    if (sigaction(SIGUSR1, &sa, (struct sigaction*) 0) != 0) {
        perror("sigaction");
        return EXIT_FAILURE;
    }
    if (sigprocmask(SIG_UNBLOCK, &mask, &old_mask) != 0) {
        perror("sigprocmask");
        return EXIT_FAILURE;
    }

    while (1) {
        (void) printf("sigsuspend returns %d ", sigsuspend(&old_mask));
        (void) printf("and errno = %d\n", errno);
    }
}


static void handle_usr1(int sig) {}

>Fix:

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