os: Initialize the set of signals to be suppressed during our handler.

Fixes a valgrind complaint:

==8805== Syscall param rt_sigaction(act->sa_mask) points to uninitialised byte(s)
==8805==    at 0x5EB8315: __libc_sigaction (sigaction.c:66)
==8805==    by 0x5B13DA: busfault_init (busfault.c:145)
==8805==    by 0x5A60A2: OsInit (osinit.c:191)
==8805==    by 0x46EBA2: dix_main (main.c:163)

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/os/busfault.c b/os/busfault.c
index 43bb6ea..ac0268f 100644 (file)
--- a/os/busfault.c
+++ b/os/busfault.c
@@ -142,6 +142,7 @@ busfault_init(void)
 
     act.sa_sigaction = busfault_sigaction;
     act.sa_flags = SA_SIGINFO;
+    sigemptyset(&act.sa_mask);
     if (sigaction(SIGBUS, &act, &old_act) < 0)
         return FALSE;
     previous_busfault_sigaction = old_act.sa_sigaction;