[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 77f8b49c7882..034b81d62bb1 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);
+        }
 }