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authordeischen <deischen@FreeBSD.org>2001-04-18 12:40:30 +0000
committerdeischen <deischen@FreeBSD.org>2001-04-18 12:40:30 +0000
commit9b1e997b4c3f3fe3b844aa1d7d10c04ec3673c36 (patch)
treecf323915fff78e7230473c0d35f8e390ac50f302 /lib/libc_r
parent28cc9e1ba4811bf0d8b85288cb95d5d3edccf019 (diff)
downloadFreeBSD-src-9b1e997b4c3f3fe3b844aa1d7d10c04ec3673c36.zip
FreeBSD-src-9b1e997b4c3f3fe3b844aa1d7d10c04ec3673c36.tar.gz
Reinstall the alternate signal stack after a fork.
PR: 25110 Tested by: knu
Diffstat (limited to 'lib/libc_r')
-rw-r--r--lib/libc_r/uthread/uthread_fork.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/libc_r/uthread/uthread_fork.c b/lib/libc_r/uthread/uthread_fork.c
index 4437d88..a2aabbe 100644
--- a/lib/libc_r/uthread/uthread_fork.c
+++ b/lib/libc_r/uthread/uthread_fork.c
@@ -32,6 +32,7 @@
* $FreeBSD$
*/
#include <errno.h>
+#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
@@ -112,7 +113,16 @@ _fork(void)
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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