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uml: eliminate SIGALRM

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Now that ITIMER_REAL is no longer used, there is no need for any use of
SIGALRM whatsoever.  This patch removes all mention of it.

In addition, real_alarm_handler took a signal argument which is now always
SIGVTALRM.  So, that is gone.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-10-16 01:27:27 -07:00 committed by Linus Torvalds
parent 5f734614fc
commit 61b63c556c
7 changed files with 17 additions and 35 deletions
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2
arch/um/os-Linux/irq.c
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@ -146,6 +146,6 @@ void init_irq_signals(int on_sigstack)
flags = on_sigstack ? SA_ONSTACK : 0;
set_handler(SIGIO, (__sighandler_t) sig_handler, flags | SA_RESTART,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
signal(SIGWINCH, SIG_IGN);
}

2
arch/um/os-Linux/main.c
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@ -161,7 +161,7 @@ int __init main(int argc, char **argv, char **envp)
* some time) and cause a segfault.
*/
/* stop timers and set SIG*ALRM to be ignored */
/* stop timers and set SIGVTALRM to be ignored */
disable_timer();
/* disable SIGIO for the fds and set SIGIO to be ignored */

10
arch/um/os-Linux/process.c
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@ -238,15 +238,15 @@ out:
void init_new_thread_signals(void)
{
set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
set_handler(SIGTRAP, (__sighandler_t) sig_handler, SA_ONSTACK,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
set_handler(SIGFPE, (__sighandler_t) sig_handler, SA_ONSTACK,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
set_handler(SIGILL, (__sighandler_t) sig_handler, SA_ONSTACK,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
signal(SIGHUP, SIG_IGN);
init_irq_signals(1);

28
arch/um/os-Linux/signal.c
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@ -15,8 +15,7 @@
#include "user.h"
/*
* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled
* together under SIGVTALRM_BIT. SIGPROF is excluded because we want to
* These are the asynchronous signals. SIGPROF is excluded because we want to
* be able to profile all of UML, not just the non-critical sections. If
* profiling is not thread-safe, then that is not my problem. We can disable
* profiling when SMP is enabled in that case.
@ -27,9 +26,6 @@
#define SIGVTALRM_BIT 1
#define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
#define SIGALRM_BIT 2
#define SIGALRM_MASK (1 << SIGALRM_BIT)
/*
* These are used by both the signal handlers and
* block/unblock_signals. I don't want modifications cached in a
@ -55,7 +51,7 @@ void sig_handler(int sig, struct sigcontext *sc)
set_signals(enabled);
}
static void real_alarm_handler(int sig, struct sigcontext *sc)
static void real_alarm_handler(struct sigcontext *sc)
{
struct uml_pt_regs regs;
@ -63,7 +59,7 @@ static void real_alarm_handler(int sig, struct sigcontext *sc)
copy_sc(&regs, sc);
regs.is_user = 0;
unblock_signals();
timer_handler(sig, &regs);
timer_handler(SIGVTALRM, &regs);
}
void alarm_handler(int sig, struct sigcontext *sc)
@ -72,27 +68,20 @@ void alarm_handler(int sig, struct sigcontext *sc)
enabled = signals_enabled;
if (!signals_enabled) {
if (sig == SIGVTALRM)
pending |= SIGVTALRM_MASK;
else pending |= SIGALRM_MASK;
pending |= SIGVTALRM_MASK;
return;
}
block_signals();
real_alarm_handler(sig, sc);
real_alarm_handler(sc);
set_signals(enabled);
}
void timer_init(void)
{
set_handler(SIGVTALRM, (__sighandler_t) alarm_handler,
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH,
SIGALRM, -1);
set_handler(SIGALRM, (__sighandler_t) alarm_handler,
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH,
SIGALRM, -1);
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, -1);
}
void set_sigstack(void *sig_stack, int size)
@ -267,11 +256,8 @@ void unblock_signals(void)
if (save_pending & SIGIO_MASK)
sig_handler_common_skas(SIGIO, NULL);
if (save_pending & SIGALRM_MASK)
real_alarm_handler(SIGALRM, NULL);
if (save_pending & SIGVTALRM_MASK)
real_alarm_handler(SIGVTALRM, NULL);
real_alarm_handler(NULL);
}
}

4
arch/um/os-Linux/skas/process.c
View File

@ -222,7 +222,6 @@ static int userspace_tramp(void *stack)
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGIO);
sigaddset(&sa.sa_mask, SIGWINCH);
sigaddset(&sa.sa_mask, SIGALRM);
sigaddset(&sa.sa_mask, SIGVTALRM);
sigaddset(&sa.sa_mask, SIGUSR1);
sa.sa_flags = SA_ONSTACK;
@ -539,8 +538,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
int n;
set_handler(SIGWINCH, (__sighandler_t) sig_handler,
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
SIGVTALRM, -1);
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGVTALRM, -1);
/*
* Can't use UML_SETJMP or UML_LONGJMP here because they save

5
arch/um/os-Linux/skas/trap.c
View File

@ -58,9 +58,8 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
handler = sig_info[sig];
/* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
if (sig != SIGIO && sig != SIGWINCH &&
sig != SIGVTALRM && sig != SIGALRM)
/* unblock SIGVTALRM, SIGIO if sig isn't IRQ signal */
if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
unblock_signals();
handler(sig, r);

1
arch/um/os-Linux/trap.c
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@ -20,5 +20,4 @@ void os_fill_handlinfo(struct kern_handlers h)
sig_info[SIGSEGV] = h.page_fault;
sig_info[SIGIO] = h.sigio_handler;
sig_info[SIGVTALRM] = h.timer_handler;
sig_info[SIGALRM] = h.timer_handler;
}