* [PATCH] Fix linuxthreads sigaction
@ 2003-11-04 18:26 Jakub Jelinek
0 siblings, 0 replies; only message in thread
From: Jakub Jelinek @ 2003-11-04 18:26 UTC (permalink / raw)
To: Ulrich Drepper, Roland McGrath; +Cc: Glibc hackers
Hi!
The following patch seems to fix testcase in
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=108634
That test doesn't use any threads, yet segfaults when linked
with LT -lpthread and doesn't when linked only against -lc.
Still, weird thing can happen if two sigaction calls are called at once
in different threads, but that was never atomic in LT.
2003-11-04 Jakub Jelinek <jakub@redhat.com>
* signals.c (__pthread_sigaction): Set __sighandler[sig].old before
__libc_sigaction if it has been one of the special values before.
--- libc/linuxthreads/signals.c.jj 2003-01-07 01:09:22.000000000 +0100
+++ libc/linuxthreads/signals.c 2003-10-31 23:44:48.000000000 +0100
@@ -78,6 +78,7 @@ int __pthread_sigaction(int sig, const s
{
struct sigaction newact;
struct sigaction *newactp;
+ __sighandler_t old = SIG_DFL;
if (sig == __pthread_sig_restart ||
sig == __pthread_sig_cancel ||
@@ -86,6 +87,8 @@ int __pthread_sigaction(int sig, const s
__set_errno (EINVAL);
return -1;
}
+ if (sig > 0 && sig < NSIG)
+ old = (__sighandler_t) __sighandler[sig].old;
if (act)
{
newact = *act;
@@ -96,21 +99,27 @@ int __pthread_sigaction(int sig, const s
newact.sa_handler = (__sighandler_t) __pthread_sighandler_rt;
else
newact.sa_handler = (__sighandler_t) __pthread_sighandler;
+ if (old == SIG_IGN || old == SIG_DFL || old == SIG_ERR)
+ __sighandler[sig].old = (arch_sighandler_t) act->sa_handler;
}
newactp = &newact;
}
else
newactp = NULL;
if (__libc_sigaction(sig, newactp, oact) == -1)
- return -1;
+ {
+ if (act)
+ __sighandler[sig].old = (arch_sighandler_t) old;
+ return -1;
+ }
if (sig > 0 && sig < NSIG)
{
if (oact != NULL
/* We may have inherited SIG_IGN from the parent, so return the
kernel's idea of the signal handler the first time
through. */
- && (__sighandler_t) __sighandler[sig].old != SIG_ERR)
- oact->sa_handler = (__sighandler_t) __sighandler[sig].old;
+ && old != SIG_ERR)
+ oact->sa_handler = old;
if (act)
/* For the assignment it does not matter whether it's a normal
or real-time signal. */
Jakub
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