Date: Tue, 21 Dec 2004 22:18:27 GMT From: Archie Cobbs <archie@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: threads/75374: pthread_kill() ignores SA_SIGINFO flag Message-ID: <200412212218.iBLMIRtD061757@beast.freebsd.org> Resent-Message-ID: <200412212220.iBLMKHEr025057@freefall.freebsd.org>
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>Number: 75374
>Category: threads
>Synopsis: pthread_kill() ignores SA_SIGINFO flag
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-threads
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Dec 21 22:20:17 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Archie Cobbs
>Release: FreeBSD 5.3-STABLE alpha
>Organization:
Packet Design
>Environment:
System: FreeBSD beast.freebsd.org 5.3-STABLE FreeBSD 5.3-STABLE #527: Tue Dec 21 15:02:03 UTC 2004 root@beast.freebsd.org:/usr/src/sys/alpha/compile/BEAST alpha
Also happens on FreeBSD 4.10.
>Description:
When a signal handler is set with the SA_SIGINFO flag,
the signal is supposed to be delivered with extra information
including the siginfo_t and ucontext_t structures.
pthread_kill() seems to ignore this flag, at least when
sending the signal to oneself.
>How-To-Repeat:
/*
* Note that the program below prints "info=0x0 ctx=0x0" which shows that
* no SA_SIGINFO context is being passed
*
* Compile: cc -Wall -o bug bug.c -pthread
*/
#include <err.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void
handler(int sig, siginfo_t *info, void *ctx)
{
printf("info=%p ctx=%p\n", info, ctx);
}
static void *
entry(void *arg)
{
pthread_kill(pthread_self(), SIGSEGV);
return NULL;
}
int
main(int ac, char **av)
{
struct sigaction sa;
pthread_t tid;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGSEGV);
sa.sa_flags = SA_SIGINFO | SA_NODEFER;
sa.sa_sigaction = handler;
if (sigaction(SIGSEGV, &sa, NULL) == -1)
err(1, "sigaction");
if ((errno = pthread_create(&tid, NULL, entry, NULL)) != 0)
err(1, "pthread_create");
if ((errno = pthread_join(tid, NULL)) != 0)
err(1, "pthread_join");
return 0;
}
>Fix:
Unknown.
>Release-Note:
>Audit-Trail:
>Unformatted:
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