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Message-ID: <20080102200853.GA7954@c2.user-mode-linux.org>
Date: Wed, 2 Jan 2008 15:08:53 -0500
From: Jeff Dike <jdike@...toit.com>
To: Andrew Morton <akpm@...l.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 4/7] UML - Signal handling tidying
This patch tidies the signal handling code slightly.
pending is renamed to signals_pending for symmetry with signals_enabled.
remove_sigstack was unused, so can be deleted.
The value of change_sig was never used, so it is now void and the
return value is not calculated any more.
Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
---
arch/um/os-Linux/signal.c | 31 +++++++++++--------------------
1 file changed, 11 insertions(+), 20 deletions(-)
Index: linux-2.6-git/arch/um/os-Linux/signal.c
===================================================================
--- linux-2.6-git.orig/arch/um/os-Linux/signal.c 2007-12-14 10:29:21.000000000 -0500
+++ linux-2.6-git/arch/um/os-Linux/signal.c 2007-12-14 10:41:00.000000000 -0500
@@ -63,7 +63,7 @@ static void sig_handler_common(int sig,
#define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
static int signals_enabled;
-static unsigned int pending;
+static unsigned int signals_pending;
void sig_handler(int sig, struct sigcontext *sc)
{
@@ -71,7 +71,7 @@ void sig_handler(int sig, struct sigcont
enabled = signals_enabled;
if (!enabled && (sig == SIGIO)) {
- pending |= SIGIO_MASK;
+ signals_pending |= SIGIO_MASK;
return;
}
@@ -99,7 +99,7 @@ void alarm_handler(int sig, struct sigco
enabled = signals_enabled;
if (!signals_enabled) {
- pending |= SIGVTALRM_MASK;
+ signals_pending |= SIGVTALRM_MASK;
return;
}
@@ -125,16 +125,6 @@ void set_sigstack(void *sig_stack, int s
panic("enabling signal stack failed, errno = %d\n", errno);
}
-void remove_sigstack(void)
-{
- stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE,
- .ss_sp = NULL,
- .ss_size = 0 });
-
- if (sigaltstack(&stack, NULL) != 0)
- panic("disabling signal stack failed, errno = %d\n", errno);
-}
-
void (*handlers[_NSIG])(int sig, struct sigcontext *sc);
void handle_signal(int sig, struct sigcontext *sc)
@@ -213,13 +203,14 @@ void set_handler(int sig, void (*handler
int change_sig(int signal, int on)
{
- sigset_t sigset, old;
+ sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, signal);
- if (sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old) < 0)
+ if (sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, NULL) < 0)
return -errno;
- return !sigismember(&old, signal);
+
+ return 0;
}
void block_signals(void)
@@ -244,26 +235,26 @@ void unblock_signals(void)
/*
* We loop because the IRQ handler returns with interrupts off. So,
* interrupts may have arrived and we need to re-enable them and
- * recheck pending.
+ * recheck signals_pending.
*/
while(1) {
/*
* Save and reset save_pending after enabling signals. This
- * way, pending won't be changed while we're reading it.
+ * way, signals_pending won't be changed while we're reading it.
*/
signals_enabled = 1;
/*
- * Setting signals_enabled and reading pending must
+ * Setting signals_enabled and reading signals_pending must
* happen in this order.
*/
barrier();
- save_pending = pending;
+ save_pending = signals_pending;
if (save_pending == 0)
return;
- pending = 0;
+ signals_pending = 0;
/*
* We have pending interrupts, so disable signals, as the
--
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