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avoid the thread-ptr-init behavior of sigaction when not installing handler

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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.
This commit is contained in:
Rich Felker 2012-10-11 22:51:05 -04:00
commit 964e9f3c4c
1 changed files with 2 additions and 1 deletions
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3
src/signal/sigaction.c
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@ -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) {