[IA64] Add TIF_RESTORE_SIGMASK

Preparation for pselect and ppoll.
ia32 compat code not tested. :-(

Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 23 insertions, 48 deletions

diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index 77f8b49c788..034b81d62bb 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -41,47 +41,6 @@
 # define GET_SIGSET(k,u)	__get_user((k)->sig[0], &(u)->sig[0])
 #endif
 
-long
-ia64_rt_sigsuspend (sigset_t __user *uset, size_t sigsetsize, struct sigscratch *scr)
-{
-	sigset_t oldset, set;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	if (!access_ok(VERIFY_READ, uset, sigsetsize))
-		return -EFAULT;
-
-	if (GET_SIGSET(&set, uset))
-		return -EFAULT;
-
-	sigdelsetmask(&set, ~_BLOCKABLE);
-
-	spin_lock_irq(&current->sighand->siglock);
-	{
-		oldset = current->blocked;
-		current->blocked = set;
-		recalc_sigpending();
-	}
-	spin_unlock_irq(&current->sighand->siglock);
-
-	/*
-	 * The return below usually returns to the signal handler.  We need to
-	 * pre-set the correct error code here to ensure that the right values
-	 * get saved in sigcontext by ia64_do_signal.
-	 */
-	scr->pt.r8 = EINTR;
-	scr->pt.r10 = -1;
-
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		if (ia64_do_signal(&oldset, scr, 1))
-			return -EINTR;
-	}
-}
-
 asmlinkage long
 sys_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, long arg2,
 		 long arg3, long arg4, long arg5, long arg6, long arg7,
@@ -478,10 +437,11 @@ handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigse
  * Note that `init' is a special process: it doesn't get signals it doesn't want to
  * handle.  Thus you cannot kill init even with a SIGKILL even by mistake.
  */
-long
-ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
+void
+ia64_do_signal (struct sigscratch *scr, long in_syscall)
 {
 	struct k_sigaction ka;
+	sigset_t *oldset;
 	siginfo_t info;
 	long restart = in_syscall;
 	long errno = scr->pt.r8;
@@ -493,9 +453,11 @@ ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 	 * doing anything if so.
 	 */
 	if (!user_mode(&scr->pt))
-		return 0;
+		return;
 
-	if (!oldset)
+	if (test_thread_flag(TIF_RESTORE_SIGMASK))
+		oldset = &current->saved_sigmask;
+	else
 		oldset = &current->blocked;
 
 	/*
@@ -558,8 +520,15 @@ ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 		 * Whee!  Actually deliver the signal.  If the delivery failed, we need to
 		 * continue to iterate in this loop so we can deliver the SIGSEGV...
 		 */
-		if (handle_signal(signr, &ka, &info, oldset, scr))
-			return 1;
+		if (handle_signal(signr, &ka, &info, oldset, scr)) {
+			/* a signal was successfully delivered; the saved
+			 * sigmask will have been stored in the signal frame,
+			 * and will be restored by sigreturn, so we can simply
+			 * clear the TIF_RESTORE_SIGMASK flag */
+			if (test_thread_flag(TIF_RESTORE_SIGMASK))
+				clear_thread_flag(TIF_RESTORE_SIGMASK);
+			return;
+		}
 	}
 
 	/* Did we come from a system call? */
@@ -585,5 +554,11 @@ ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 			}
 		}
 	}
-	return 0;
+
+	/* if there's no signal to deliver, we just put the saved sigmask
+	 * back */
+	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+		clear_thread_flag(TIF_RESTORE_SIGMASK);
+		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+	}
 }