path: root/src/thread
diff options
authorRich Felker <>2012-05-25 22:34:09 -0400
committerRich Felker <>2012-05-25 22:34:09 -0400
commit8cce15af83c04d8965561439f0a80a451a9b1af0 (patch)
tree9cd48519aaeb3de0cf56792c8f015b3b39076e41 /src/thread
parent8b4c232efe182f4a9c8c52c5638af8fec92987bf (diff)
ensure pthread-internal signals are unblocked before threads are used
if the process started with these signals blocked, cancellation could fail or setxid could deadlock. there is no way to globally unblock them after threads have been created. by unblocking them in the pthread_self initialization for the main thread, we ensure that they're unblocked before any other threads are created and also outside of any signal handler context (sigaction initialized pthread_self), which is important so that return from a signal handler won't re-block them.
Diffstat (limited to 'src/thread')
1 files changed, 1 insertions, 0 deletions
diff --git a/src/thread/pthread_self.c b/src/thread/pthread_self.c
index 51f12bb3..f68896f7 100644
--- a/src/thread/pthread_self.c
+++ b/src/thread/pthread_self.c
@@ -8,6 +8,7 @@ weak_alias(dummy, __pthread_tsd_main);
static int init_main_thread()
+ __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
if (__set_thread_area(&main_thread) < 0) return -1;
main_thread.canceldisable = libc.canceldisable;
main_thread.tsd = (void **)__pthread_tsd_main;