MFC r287292:

Switch libc from using _sig{procmask,action,suspend} symbols, which
are aliases for the syscall stubs and are plt-interposed, to the
libc-private aliases of internally interposed sigprocmask() etc.

MFC r287300:
Use libthr interposed functions instead of syscalls, in posix_spawn()'
child.

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/libc/gen/posix_spawn.c b/lib/libc/gen/posix_spawn.c
index e3124b2..c65a730 100644
--- a/lib/libc/gen/posix_spawn.c
+++ b/lib/libc/gen/posix_spawn.c
@@ -118,15 +118,18 @@ process_spawnattr(const posix_spawnattr_t sa)
 			return (errno);
 	}
 
-	/* Set signal masks/defaults */
+	/*
+	 * Set signal masks/defaults.
+	 * Use unwrapped syscall, libthr is in undefined state after vfork().
+	 */
 	if (sa->sa_flags & POSIX_SPAWN_SETSIGMASK) {
-		_sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL);
+		__sys_sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL);
 	}
 
 	if (sa->sa_flags & POSIX_SPAWN_SETSIGDEF) {
 		for (i = 1; i <= _SIG_MAXSIG; i++) {
 			if (sigismember(&sa->sa_sigdefault, i))
-				if (_sigaction(i, &sigact, NULL) != 0)
+				if (__sys_sigaction(i, &sigact, NULL) != 0)
 					return (errno);
 		}
 	}