Date: Fri, 16 Feb 2001 01:00:34 -0800 (PST) From: jagarl@creator.club.ne.jp To: freebsd-gnats-submit@FreeBSD.org Subject: bin/25132: sigprocmask problem with pthread Message-ID: <200102160900.f1G90Yx72349@freefall.freebsd.org>
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>Number: 25132
>Category: bin
>Synopsis: sigprocmask problem with pthread
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Feb 16 01:10:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Kazunori Ueno
>Release: 4.2-RELEASE
>Organization:
Univ. of Tokyo, Japan
>Environment:
FreeBSD KitzBSD.chem.t.u-tokyo.ac.jp 4.2-RELEASE FreeBSD 4.2-RELEASE #1: Mon Jan 15 20:14:10 JST 2001 root@KitzBSD.chem.t.u-tokyo.ac.jp:/usr/src/sys/compile/KitzBSD i386
>Description:
I want to block a signal by sigprocmask, but the signal is not blocked.
Following description is for SIGTERM signal.
In pthread library, signal is trapped by thread_sig_handler(). If
the signal mask is set, the signal blocks in the handler. But
thread_init() sets thread_sig_hander() as signal handler only for
_SCHED_SIGNAL, SIGINFO and SIGCHLD. When the SIGTERM signal is caught,
the signal is processed in kernel and default handler (kill process)
is called.
If I set some signal hander for SIGTERM, then thread_sig_handler() is
used as the signal handler for SIGTERM. Then the signal mask is correctly
used.
>How-To-Repeat:
Compile this program with -pthread option. For example,
cc test.c -pthread
This program should block 'SIGTERM' signal, but 'kill -TERM pid' kills
this program.
#include <signal.h>
int main()
{
sigset_t tset;
sigemptyset(&tset);
sigaddset(&tset, SIGTERM);
sigprocmask(SIG_BLOCK,&tset,NULL);
while(1) ;
}
But this program correctly blocks the signal.
#include <signal.h>
void handler(int sig) {
_exit(0);
}
int main()
{
sigset_t tset;
sigemptyset(&tset);
sigaddset(&tset, SIGTERM);
sigprocmask(SIG_BLOCK,&tset,NULL);
signal(SIGTERM,handler);
while(1) ;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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