From 69be8f189653cd81aae5a74e26615b12871bb72e Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Mon, 29 Aug 2005 11:44:09 -0400 Subject: [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 --- arch/mips/kernel/irixsig.c | 11 +++++------ arch/mips/kernel/signal.c | 11 +++++------ arch/mips/kernel/signal32.c | 11 +++++------ 3 files changed, 15 insertions(+), 18 deletions(-) (limited to 'arch/mips/kernel') diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c index 40244782a8e..4c114ae2179 100644 --- a/arch/mips/kernel/irixsig.c +++ b/arch/mips/kernel/irixsig.c @@ -155,13 +155,12 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info, else setup_irix_frame(ka, regs, sig, oldset); - if (!(ka->sa.sa_flags & SA_NODEFER)) { - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + if (!(ka->sa.sa_flags & SA_NODEFER)) sigaddset(¤t->blocked,sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); } asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs) diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index 65ee15396ff..0209c1dd142 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -425,13 +425,12 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info, setup_frame(ka, regs, sig, oldset); #endif - if (!(ka->sa.sa_flags & SA_NODEFER)) { - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + if (!(ka->sa.sa_flags & SA_NODEFER)) sigaddset(¤t->blocked,sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); } extern int do_signal32(sigset_t *oldset, struct pt_regs *regs); diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c index c1a69cf232f..f6875f023a2 100644 --- a/arch/mips/kernel/signal32.c +++ b/arch/mips/kernel/signal32.c @@ -751,13 +751,12 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info, else setup_frame(ka, regs, sig, oldset); - if (!(ka->sa.sa_flags & SA_NODEFER)) { - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + if (!(ka->sa.sa_flags & SA_NODEFER)) sigaddset(¤t->blocked,sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); } int do_signal32(sigset_t *oldset, struct pt_regs *regs) -- cgit v1.2.3