1 #include <signal.h>
2 
3 #include <u.h>
4 #define NOPLAN9DEFINES
5 #include <libc.h>
6 #include "9proc.h"
7 
8 extern char *_p9sigstr(int, char*);
9 
10 static struct {
11 	int sig;
12 	int restart;
13 } sigs[] = {
14 	SIGHUP, 0,
15 	SIGINT, 0,
16 	SIGQUIT, 0,
17 	SIGILL, 0,
18 	SIGTRAP, 0,
19 /*	SIGABRT,	*/
20 #ifdef SIGEMT
21 	SIGEMT, 0,
22 #endif
23 	SIGFPE, 0,
24 	SIGBUS, 0,
25 /*	SIGSEGV,	*/
26 	SIGCHLD, 1,
27 	SIGSYS, 0,
28 	SIGPIPE, 0,
29 	SIGALRM, 0,
30 	SIGTERM, 0,
31 	SIGTSTP, 1,
32 	SIGTTIN, 1,
33 	SIGTTOU, 1,
34 	SIGXCPU, 0,
35 	SIGXFSZ, 0,
36 	SIGVTALRM, 0,
37 	SIGUSR1, 0,
38 	SIGUSR2, 0,
39 #ifdef SIGINFO
40 	SIGINFO, 0,
41 #endif
42 };
43 
44 static void (*notifyf)(void*, char*);
45 
46 static void
47 notifysigf(int sig)
48 {
49 	int v;
50 	char tmp[64];
51 	Uproc *up;
52 
53 	up = _p9uproc();
54 	v = p9setjmp(up->notejb);
55 	if(v == 0 && notifyf)
56 		(*notifyf)(nil, _p9sigstr(sig, tmp));
57 	else if(v == 2){
58 if(0)print("HANDLED %d\n", sig);
59 		return;
60 	}
61 if(0)print("DEFAULT %d\n", sig);
62 	signal(sig, SIG_DFL);
63 	kill(getpid(), sig);
64 }
65 	
66 int
67 notify(void (*f)(void*, char*))
68 {
69 	int i;
70 	struct sigaction sa;
71 
72 	memset(&sa, 0, sizeof sa);
73 	if(f == nil)
74 		sa.sa_handler = SIG_DFL;
75 	else{
76 		notifyf = f;
77 		sa.sa_handler = notifysigf;
78 	}
79 	for(i=0; i<nelem(sigs); i++){
80 		if(sigs[i].restart)
81 			sa.sa_flags |= SA_RESTART;
82 		else
83 			sa.sa_flags &= ~SA_RESTART;
84 		sigaction(sigs[i].sig, &sa, 0);
85 	}
86 	return 0;
87 }
88 
89 int
90 noted(int v)
91 {
92 	Uproc *up;
93 
94 	up = _p9uproc();
95 	p9longjmp(up->notejb, v==NCONT ? 2 : 1);
96 	abort();
97 	return 0;
98 }