- Merge struct procsig with struct sigacts.

- Move struct sigacts out of the u-area and malloc() it using the
  M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures: sigacts_alloc(),
  sigacts_free(), sigacts_copy(), sigacts_share(), and sigacts_shared().
- Remove the p_sigignore, p_sigacts, and p_sigcatch macros.
- Add a mutex to struct sigacts that protects all the members of the struct.
- Add sigacts locking.
- Remove Giant from nosys(), kill(), killpg(), and kern_sigaction() now
  that sigacts is locked.
- Several in-kernel functions such as psignal(), tdsignal(), trapsignal(),
  and thread_stopped() are now MP safe.

Reviewed by:	arch@
Approved by:	re (rwatson)

1 files changed, 7 insertions, 3 deletions

diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index 6810537..7665674 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -623,6 +623,7 @@ fill_kinfo_proc(p, kp)
 	struct tty *tp;
 	struct session *sp;
 	struct timeval tv;
+	struct sigacts *ps;
 
 	td = FIRST_THREAD_IN_PROC(p);
 
@@ -653,9 +654,12 @@ fill_kinfo_proc(p, kp)
 		kp->ki_rgid = p->p_ucred->cr_rgid;
 		kp->ki_svgid = p->p_ucred->cr_svgid;
 	}
-	if (p->p_procsig) {
-		kp->ki_sigignore = p->p_procsig->ps_sigignore;
-		kp->ki_sigcatch = p->p_procsig->ps_sigcatch;
+	if (p->p_sigacts) {
+		ps = p->p_sigacts;
+		mtx_lock(&ps->ps_mtx);
+		kp->ki_sigignore = ps->ps_sigignore;
+		kp->ki_sigcatch = ps->ps_sigcatch;
+		mtx_unlock(&ps->ps_mtx);
 	}
 	mtx_lock_spin(&sched_lock);
 	if (p->p_state != PRS_NEW &&