From owner-freebsd-bugs  Fri Nov 10 15:20: 9 2000
Delivered-To: freebsd-bugs@freebsd.org
Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21])
	by hub.freebsd.org (Postfix) with ESMTP id A741037B4E5
	for <freebsd-bugs@FreeBSD.org>; Fri, 10 Nov 2000 15:20:01 -0800 (PST)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.9.3/8.9.2) id PAA25621;
	Fri, 10 Nov 2000 15:20:01 -0800 (PST)
	(envelope-from gnats@FreeBSD.org)
Received: by hub.freebsd.org (Postfix, from userid 32767)
	id AAD0737B479; Fri, 10 Nov 2000 15:16:34 -0800 (PST)
Message-Id: <20001110231634.AAD0737B479@hub.freebsd.org>
Date: Fri, 10 Nov 2000 15:16:34 -0800 (PST)
From: jogibson@cisco.com
To: freebsd-gnats-submit@FreeBSD.org
X-Send-Pr-Version: www-1.0
Subject: misc/22758: select returns 0 on receipt of SIGALRM when linked with pthreads.
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org


>Number:         22758
>Category:       misc
>Synopsis:       select returns 0 on receipt of SIGALRM when linked with pthreads.
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov 10 15:20:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     John Gibson
>Release:        4.0-STABLE, 4.1.1-STABLE
>Organization:
Cisco Systems
>Environment:
FreeBSD 4.1.1-STABLE FreeBSD 4.1.1-STABLE #0: Mon Oct 30 07:47:02 EST 2000 i386
>Description:
On receipt of a SIGALRM, select will return 0 when linked to the 
reentrant C library libc_r (for pthreads) and not set errno to EINTR.
When linked to libc (no pthreads) select returns -1 and sets errno
to EINTR.
>How-To-Repeat:
/*
 * testsel.c
 * On receipt of SIGALRM, select() returns:
 *      0 when linked with libc_r
 *      -1 otherwise.
 *
 * Tp compile with threads...
 * cc -o testsel testsel.c -pthread
 *
 * To compile without threads...
 * cc -o testsel testsel.c 
 */
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>

handle_sigalarm(void)
{
  fprintf(stderr,"ALARM!\n");
}

int
main(void)
{
  struct sigaction sact;
  fd_set fds;
  int error;

  sact.sa_flags   = 1;
  sact.sa_handler = (sig_t) handle_sigalarm;
  sigaction(SIGALRM, &sact, NULL);

  FD_ZERO(&fds);
  alarm(1);

  fprintf(stderr, "test: calling select...\n");
  error = select(0, &fds, 0, 0, 0);

  fprintf(stderr, "test: select returned %d\n", error); 
  if (errno == EINTR)
    fprintf(stderr, "test: errno=EINTR\n");
  else
    fprintf(stderr, "test: errno!=EINTR (error: %s)\n", strerror(errno));
}

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message