2 * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
14 #include "user_util.h"
15 #include "kern_util.h"
17 #include "signal_user.h"
18 #include "signal_kern.h"
19 #include "sysdep/sigcontext.h"
20 #include "sigcontext.h"
22 void set_sigstack(void *sig_stack, int size)
24 stack_t stack = ((stack_t) { .ss_flags = 0,
25 .ss_sp = (__ptr_t) sig_stack,
26 .ss_size = size - sizeof(void *) });
28 if(sigaltstack(&stack, NULL) != 0)
29 panic("enabling signal stack failed, errno = %d\n", errno);
32 void set_handler(int sig, void (*handler)(int), int flags, ...)
34 struct sigaction action;
39 action.sa_handler = handler;
40 sigemptyset(&action.sa_mask);
41 while((mask = va_arg(ap, int)) != -1){
42 sigaddset(&action.sa_mask, mask);
44 action.sa_flags = flags;
45 action.sa_restorer = NULL;
46 if(sigaction(sig, &action, NULL) < 0)
47 panic("sigaction failed");
50 int change_sig(int signal, int on)
55 sigaddset(&sigset, signal);
56 sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old);
57 return(!sigismember(&old, signal));
60 static void change_signals(int type)
65 sigaddset(&mask, SIGVTALRM);
66 sigaddset(&mask, SIGALRM);
67 sigaddset(&mask, SIGIO);
68 sigaddset(&mask, SIGPROF);
69 if(sigprocmask(type, &mask, NULL) < 0)
70 panic("Failed to change signal mask - errno = %d", errno);
73 void block_signals(void)
75 change_signals(SIG_BLOCK);
78 void unblock_signals(void)
80 change_signals(SIG_UNBLOCK);
84 #define SIGVTALRM_BIT 1
86 static int enable_mask(sigset_t *mask)
90 sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT;
91 sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT;
92 sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT;
100 if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0)
101 panic("Failed to get signal mask");
102 return(enable_mask(&mask));
105 int set_signals(int enable)
111 if(enable & (1 << SIGIO_BIT))
112 sigaddset(&mask, SIGIO);
113 if(enable & (1 << SIGVTALRM_BIT)){
114 sigaddset(&mask, SIGVTALRM);
115 sigaddset(&mask, SIGALRM);
117 if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0)
118 panic("Failed to enable signals");
119 ret = enable_mask(&mask);
121 if((enable & (1 << SIGIO_BIT)) == 0)
122 sigaddset(&mask, SIGIO);
123 if((enable & (1 << SIGVTALRM_BIT)) == 0){
124 sigaddset(&mask, SIGVTALRM);
125 sigaddset(&mask, SIGALRM);
127 if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
128 panic("Failed to block signals");
134 * Overrides for Emacs so that we follow Linus's tabbing style.
135 * Emacs will notice this stuff at the end of the file and automatically
136 * adjust the settings for this buffer only. This must remain at the end
138 * ---------------------------------------------------------------------------
140 * c-file-style: "linux"