Akinori MUSHA wrote:
>
> Hi,
>
> Would you take a look at PR#25110 ? Some programs are suffering with
> a problem that with the threaded library a process cannot receive due
> signals except SIGKILL and SIGSTOP from its children and thus it
> stalls at waitpid() after forking.
>
> The PR precisely describes the underlying cause and points out how you
> can examine and solve the problem.
>
> I'd appreciate if you or someone else with a clue could deal with it.
You can try the patch below. I think I've posted this patch before,
but I guess I never committed it.
--
Dan Eischen
Index: uthread/uthread_fork.c
===================================================================
RCS file: /opt/b/CVS/src/lib/libc_r/uthread/uthread_fork.c,v
retrieving revision 1.23
diff -u -r1.23 uthread_fork.c
--- uthread/uthread_fork.c 2001/04/10 04:25:49 1.23
+++ uthread/uthread_fork.c 2001/04/17 14:44:37
@@ -32,6 +32,7 @@
* $FreeBSD: src/lib/libc_r/uthread/uthread_fork.c,v 1.23 2001/04/10 04:25:49
deischen Exp $
*/
#include <errno.h>
+#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
@@ -112,7 +113,16 @@
else if (_pq_init(&_readyq) != 0) {
/* Abort this application: */
PANIC("Cannot initialize priority ready queue.");
- } else {
+ } else if ((_thread_sigstack.ss_sp == NULL) &&
+ ((_thread_sigstack.ss_sp = malloc(SIGSTKSZ)) == NULL))
+ PANIC("Unable to allocate alternate signal stack");
+ else {
+ /* Install the alternate signal stack: */
+ _thread_sigstack.ss_size = SIGSTKSZ;
+ _thread_sigstack.ss_flags = 0;
+ if (__sys_sigaltstack(&_thread_sigstack, NULL) != 0)
+ PANIC("Unable to install alternate signal stack");
+
/*
* Enter a loop to remove all threads other than
* the running thread from the thread list:
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