X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fum%2Fkernel%2Fsignal_kern.c;fp=arch%2Fum%2Fkernel%2Fsignal_kern.c;h=da17b7541e08dd4c2526159f6a2cfaab94ee7486;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=7807a3e8c426e362233c797a563f89523c2b7439;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git

diff --git a/arch/um/kernel/signal_kern.c b/arch/um/kernel/signal_kern.c
index 7807a3e8c..da17b7541 100644
--- a/arch/um/kernel/signal_kern.c
+++ b/arch/um/kernel/signal_kern.c
@@ -22,7 +22,6 @@
 #include "asm/ucontext.h"
 #include "kern_util.h"
 #include "signal_kern.h"
-#include "signal_user.h"
 #include "kern.h"
 #include "frame_kern.h"
 #include "sigcontext.h"
@@ -87,12 +86,12 @@ static int handle_signal(struct pt_regs *regs, unsigned long signr,
 		recalc_sigpending();
 		spin_unlock_irq(&current->sighand->siglock);
 		force_sigsegv(signr, current);
-	}
-	else if(!(ka->sa.sa_flags & SA_NODEFER)){
+	} else {
 		spin_lock_irq(&current->sighand->siglock);
 		sigorsets(&current->blocked, &current->blocked, 
 			  &ka->sa.sa_mask);
-		sigaddset(&current->blocked, signr);
+		 if(!(ka->sa.sa_flags & SA_NODEFER))
+			sigaddset(&current->blocked, signr);
 		recalc_sigpending();
 		spin_unlock_irq(&current->sighand->siglock);
 	}
@@ -100,31 +99,46 @@ static int handle_signal(struct pt_regs *regs, unsigned long signr,
 	return err;
 }
 
-static int kern_do_signal(struct pt_regs *regs, sigset_t *oldset)
+static int kern_do_signal(struct pt_regs *regs)
 {
 	struct k_sigaction ka_copy;
 	siginfo_t info;
+	sigset_t *oldset;
 	int sig, handled_sig = 0;
 
+	if (test_thread_flag(TIF_RESTORE_SIGMASK))
+		oldset = &current->saved_sigmask;
+	else
+		oldset = &current->blocked;
+
 	while((sig = get_signal_to_deliver(&info, &ka_copy, regs, NULL)) > 0){
 		handled_sig = 1;
 		/* Whee!  Actually deliver the signal.  */
-		if(!handle_signal(regs, sig, &ka_copy, &info, oldset))
+		if(!handle_signal(regs, sig, &ka_copy, &info, oldset)){
+			/* 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);
 			break;
+		}
 	}
 
 	/* Did we come from a system call? */
 	if(!handled_sig && (PT_REGS_SYSCALL_NR(regs) >= 0)){
 		/* Restart the system call - no handlers present */
-		if(PT_REGS_SYSCALL_RET(regs) == -ERESTARTNOHAND ||
-		   PT_REGS_SYSCALL_RET(regs) == -ERESTARTSYS ||
-		   PT_REGS_SYSCALL_RET(regs) == -ERESTARTNOINTR){
+		switch(PT_REGS_SYSCALL_RET(regs)){
+		case -ERESTARTNOHAND:
+		case -ERESTARTSYS:
+		case -ERESTARTNOINTR:
 			PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
 			PT_REGS_RESTART_SYSCALL(regs);
-		}
-		else if(PT_REGS_SYSCALL_RET(regs) == -ERESTART_RESTARTBLOCK){
+			break;
+		case -ERESTART_RESTARTBLOCK:
 			PT_REGS_SYSCALL_RET(regs) = __NR_restart_syscall;
 			PT_REGS_RESTART_SYSCALL(regs);
+			break;
  		}
 	}
 
@@ -138,12 +152,19 @@ static int kern_do_signal(struct pt_regs *regs, sigset_t *oldset)
 	if(current->ptrace & PT_DTRACE)
 		current->thread.singlestep_syscall =
 			is_syscall(PT_REGS_IP(&current->thread.regs));
+
+	/* if there's no signal to deliver, we just put the saved sigmask
+	 * back */
+	if (!handled_sig && test_thread_flag(TIF_RESTORE_SIGMASK)) {
+		clear_thread_flag(TIF_RESTORE_SIGMASK);
+		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+	}
 	return(handled_sig);
 }
 
 int do_signal(void)
 {
-	return(kern_do_signal(&current->thread.regs, &current->blocked));
+	return(kern_do_signal(&current->thread.regs));
 }
 
 /*
@@ -151,63 +172,20 @@ int do_signal(void)
  */
 long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
 {
-	sigset_t saveset;
-
 	mask &= _BLOCKABLE;
 	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
+	current->saved_sigmask = current->blocked;
 	siginitset(&current->blocked, mask);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 
-	PT_REGS_SYSCALL_RET(&current->thread.regs) = -EINTR;
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		if(kern_do_signal(&current->thread.regs, &saveset))
-			return(-EINTR);
-	}
-}
-
-long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
-{
-	sigset_t saveset, newset;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	if (copy_from_user(&newset, unewset, sizeof(newset)))
-		return -EFAULT;
-	sigdelsetmask(&newset, ~_BLOCKABLE);
-
-	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
-	current->blocked = newset;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	PT_REGS_SYSCALL_RET(&current->thread.regs) = -EINTR;
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		if (kern_do_signal(&current->thread.regs, &saveset))
-			return(-EINTR);
-	}
+	current->state = TASK_INTERRUPTIBLE;
+	schedule();
+	set_thread_flag(TIF_RESTORE_SIGMASK);
+	return -ERESTARTNOHAND;
 }
 
 long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
 {
 	return(do_sigaltstack(uss, uoss, PT_REGS_SP(&current->thread.regs)));
 }
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */