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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/frv/kernel
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/frv/kernel')
-rw-r--r--arch/frv/kernel/signal.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index 36a2dffc8ebd..d4ccc0728dfe 100644
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -506,13 +506,12 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
506 else 506 else
507 setup_frame(sig, ka, oldset, regs); 507 setup_frame(sig, ka, oldset, regs);
508 508
509 if (!(ka->sa.sa_flags & SA_NODEFER)) { 509 spin_lock_irq(&current->sighand->siglock);
510 spin_lock_irq(&current->sighand->siglock); 510 sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
511 sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask); 511 if (!(ka->sa.sa_flags & SA_NODEFER))
512 sigaddset(&current->blocked, sig); 512 sigaddset(&current->blocked, sig);
513 recalc_sigpending(); 513 recalc_sigpending();
514 spin_unlock_irq(&current->sighand->siglock); 514 spin_unlock_irq(&current->sighand->siglock);
515 }
516} /* end handle_signal() */ 515} /* end handle_signal() */
517 516
518/*****************************************************************************/ 517/*****************************************************************************/