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authorSteven Rostedt <rostedt@goodmis.org>2005-08-29 11:44:09 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-08-29 13:03:11 -0400
commit69be8f189653cd81aae5a74e26615b12871bb72e (patch)
tree89c7d7b5b68ae47818b9dbc9015f1e4452ec2075 /arch/alpha
parent02b3e4e2d71b6058ec11cc01c72ac651eb3ded2b (diff)
[PATCH] convert signal handling of NODEFER to act like other Unix boxes.
It has been reported that the way Linux handles NODEFER for signals is not consistent with the way other Unix boxes handle it. I've written a program to test the behavior of how this flag affects signals and had several reports from people who ran this on various Unix boxes, confirming that Linux seems to be unique on the way this is handled. The way NODEFER affects signals on other Unix boxes is as follows: 1) If NODEFER is set, other signals in sa_mask are still blocked. 2) If NODEFER is set and the signal is in sa_mask, then the signal is still blocked. (Note: this is the behavior of all tested but Linux _and_ NetBSD 2.0 *). The way NODEFER affects signals on Linux: 1) If NODEFER is set, other signals are _not_ blocked regardless of sa_mask (Even NetBSD doesn't do this). 2) If NODEFER is set and the signal is in sa_mask, then the signal being handled is not blocked. The patch converts signal handling in all current Linux architectures to the way most Unix boxes work. Unix boxes that were tested: DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU 3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX. * NetBSD was the only other Unix to behave like Linux on point #2. The main concern was brought up by point #1 which even NetBSD isn't like Linux. So with this patch, we leave NetBSD as the lonely one that behaves differently here with #2. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/alpha')
-rw-r--r--arch/alpha/kernel/signal.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
index 08fe8071a7f8..2e45e8604e32 100644
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -566,13 +566,12 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
566 if (ka->sa.sa_flags & SA_RESETHAND) 566 if (ka->sa.sa_flags & SA_RESETHAND)
567 ka->sa.sa_handler = SIG_DFL; 567 ka->sa.sa_handler = SIG_DFL;
568 568
569 if (!(ka->sa.sa_flags & SA_NODEFER)) { 569 spin_lock_irq(&current->sighand->siglock);
570 spin_lock_irq(&current->sighand->siglock); 570 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
571 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask); 571 if (!(ka->sa.sa_flags & SA_NODEFER))
572 sigaddset(&current->blocked,sig); 572 sigaddset(&current->blocked,sig);
573 recalc_sigpending(); 573 recalc_sigpending();
574 spin_unlock_irq(&current->sighand->siglock); 574 spin_unlock_irq(&current->sighand->siglock);
575 }
576} 575}
577 576
578static inline void 577static inline void