1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
157 lines
3.8 KiB
C
157 lines
3.8 KiB
C
/*
|
|
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include "user_util.h"
|
|
#include "kern_util.h"
|
|
#include "user.h"
|
|
#include "signal_user.h"
|
|
#include "signal_kern.h"
|
|
#include "sysdep/sigcontext.h"
|
|
#include "sigcontext.h"
|
|
|
|
void set_sigstack(void *sig_stack, int size)
|
|
{
|
|
stack_t stack = ((stack_t) { .ss_flags = 0,
|
|
.ss_sp = (__ptr_t) sig_stack,
|
|
.ss_size = size - sizeof(void *) });
|
|
|
|
if(sigaltstack(&stack, NULL) != 0)
|
|
panic("enabling signal stack failed, errno = %d\n", errno);
|
|
}
|
|
|
|
void set_handler(int sig, void (*handler)(int), int flags, ...)
|
|
{
|
|
struct sigaction action;
|
|
va_list ap;
|
|
int mask;
|
|
|
|
va_start(ap, flags);
|
|
action.sa_handler = handler;
|
|
sigemptyset(&action.sa_mask);
|
|
while((mask = va_arg(ap, int)) != -1){
|
|
sigaddset(&action.sa_mask, mask);
|
|
}
|
|
va_end(ap);
|
|
action.sa_flags = flags;
|
|
action.sa_restorer = NULL;
|
|
if(sigaction(sig, &action, NULL) < 0)
|
|
panic("sigaction failed");
|
|
}
|
|
|
|
int change_sig(int signal, int on)
|
|
{
|
|
sigset_t sigset, old;
|
|
|
|
sigemptyset(&sigset);
|
|
sigaddset(&sigset, signal);
|
|
sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old);
|
|
return(!sigismember(&old, signal));
|
|
}
|
|
|
|
/* Both here and in set/get_signal we don't touch SIGPROF, because we must not
|
|
* disable profiling; it's safe because the profiling code does not interact
|
|
* with the kernel code at all.*/
|
|
|
|
static void change_signals(int type)
|
|
{
|
|
sigset_t mask;
|
|
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, SIGVTALRM);
|
|
sigaddset(&mask, SIGALRM);
|
|
sigaddset(&mask, SIGIO);
|
|
if(sigprocmask(type, &mask, NULL) < 0)
|
|
panic("Failed to change signal mask - errno = %d", errno);
|
|
}
|
|
|
|
void block_signals(void)
|
|
{
|
|
change_signals(SIG_BLOCK);
|
|
}
|
|
|
|
void unblock_signals(void)
|
|
{
|
|
change_signals(SIG_UNBLOCK);
|
|
}
|
|
|
|
/* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled
|
|
* together under SIGVTALRM_BIT. 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.
|
|
*/
|
|
#define SIGIO_BIT 0
|
|
#define SIGVTALRM_BIT 1
|
|
|
|
static int enable_mask(sigset_t *mask)
|
|
{
|
|
int sigs;
|
|
|
|
sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT;
|
|
sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT;
|
|
sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT;
|
|
return(sigs);
|
|
}
|
|
|
|
int get_signals(void)
|
|
{
|
|
sigset_t mask;
|
|
|
|
if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0)
|
|
panic("Failed to get signal mask");
|
|
return(enable_mask(&mask));
|
|
}
|
|
|
|
int set_signals(int enable)
|
|
{
|
|
sigset_t mask;
|
|
int ret;
|
|
|
|
sigemptyset(&mask);
|
|
if(enable & (1 << SIGIO_BIT))
|
|
sigaddset(&mask, SIGIO);
|
|
if(enable & (1 << SIGVTALRM_BIT)){
|
|
sigaddset(&mask, SIGVTALRM);
|
|
sigaddset(&mask, SIGALRM);
|
|
}
|
|
|
|
/* This is safe - sigprocmask is guaranteed to copy locally the
|
|
* value of new_set, do his work and then, at the end, write to
|
|
* old_set.
|
|
*/
|
|
if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0)
|
|
panic("Failed to enable signals");
|
|
ret = enable_mask(&mask);
|
|
sigemptyset(&mask);
|
|
if((enable & (1 << SIGIO_BIT)) == 0)
|
|
sigaddset(&mask, SIGIO);
|
|
if((enable & (1 << SIGVTALRM_BIT)) == 0){
|
|
sigaddset(&mask, SIGVTALRM);
|
|
sigaddset(&mask, SIGALRM);
|
|
}
|
|
if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
|
|
panic("Failed to block signals");
|
|
|
|
return(ret);
|
|
}
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|