From 61b63c556c0877ee6d3832ee641bc427ff4d94d6 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Tue, 16 Oct 2007 01:27:27 -0700 Subject: [PATCH] uml: eliminate SIGALRM 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 Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/os-Linux/irq.c | 2 +- arch/um/os-Linux/main.c | 2 +- arch/um/os-Linux/process.c | 10 +++++----- arch/um/os-Linux/signal.c | 28 +++++++--------------------- arch/um/os-Linux/skas/process.c | 4 +--- arch/um/os-Linux/skas/trap.c | 5 ++--- arch/um/os-Linux/trap.c | 1 - 7 files changed, 17 insertions(+), 35 deletions(-) diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c index 2fe482219b6..6aa6f95d652 100644 --- a/arch/um/os-Linux/irq.c +++ b/arch/um/os-Linux/irq.c @@ -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); } diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c index 1518f7a45a2..82c3778627b 100644 --- a/arch/um/os-Linux/main.c +++ b/arch/um/os-Linux/main.c @@ -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 */ diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c index 90b480cf78f..37781db4cec 100644 --- a/arch/um/os-Linux/process.c +++ b/arch/um/os-Linux/process.c @@ -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); diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index fbad174775e..e9800b0b568 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -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(®s, sc); regs.is_user = 0; unblock_signals(); - timer_handler(sig, ®s); + timer_handler(SIGVTALRM, ®s); } 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); } } diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 3e64814e888..9936531a262 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -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 diff --git a/arch/um/os-Linux/skas/trap.c b/arch/um/os-Linux/skas/trap.c index e53face4420..3b1b9244f46 100644 --- a/arch/um/os-Linux/skas/trap.c +++ b/arch/um/os-Linux/skas/trap.c @@ -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); diff --git a/arch/um/os-Linux/trap.c b/arch/um/os-Linux/trap.c index d3a34ca8a89..2a1c9843e32 100644 --- a/arch/um/os-Linux/trap.c +++ b/arch/um/os-Linux/trap.c @@ -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; } -- 2.41.1