From 964e9f3c4c8776820e98c967f3a411d4ca5075a7 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Thu, 11 Oct 2012 22:51:05 -0400 Subject: avoid the thread-ptr-init behavior of sigaction when not installing handler this is necessary because posix_spawn calls sigaction after vfork, and if the thread pointer is not already initialized, initializing it in the child corrupts the parent process's state. --- src/signal/sigaction.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'src') diff --git a/src/signal/sigaction.c b/src/signal/sigaction.c index 2331dc93..d9535032 100644 --- a/src/signal/sigaction.c +++ b/src/signal/sigaction.c @@ -15,12 +15,13 @@ int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigact { struct k_sigaction ksa; if (sa) { + if ((uintptr_t)sa->sa_handler > 1UL) + __pthread_self_def(); ksa.handler = sa->sa_handler; ksa.flags = sa->sa_flags | SA_RESTORER; ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore; memcpy(&ksa.mask, &sa->sa_mask, sizeof ksa.mask); } - __pthread_self_def(); if (syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa:0, sizeof ksa.mask)) return -1; if (old) { -- cgit v1.2.1