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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/ape/lib/ap/plan9/signal.c – Rev 2

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#include "lib.h"
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#include "sys9.h"
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#include <signal.h>
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#include <errno.h>
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#include <string.h>
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#include <setjmp.h>
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extern sigset_t	_psigblocked;
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static struct {
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	char	*msg;	/* just check prefix */
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	int	num;
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} sigtab[] = {
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	{"hangup",				SIGHUP},
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	{"interrupt",				SIGINT},
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	{"quit",				SIGQUIT},
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	{"alarm",				SIGALRM},
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	{"sys: trap: illegal instruction",	SIGILL},
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	{"sys: trap: reserved instruction",	SIGILL},
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	{"sys: trap: reserved",			SIGILL},
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	{"sys: trap: arithmetic overflow",	SIGFPE},
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	{"abort",				SIGABRT},
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	{"sys: fp:",				SIGFPE},
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	{"exit",				SIGKILL},
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	{"die",					SIGKILL},
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	{"kill",				SIGKILL},
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	{"sys: trap: bus error",		SIGSEGV},
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	{"sys: trap: address error",		SIGSEGV},
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	{"sys: trap: TLB",			SIGSEGV},
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	{"sys: write on closed pipe",		SIGPIPE},
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	{"alarm",				SIGALRM},
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	{"term",				SIGTERM},
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	{"usr1",				SIGUSR1},
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	{"usr2",				SIGUSR2},
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};
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#define NSIGTAB ((sizeof sigtab)/(sizeof (sigtab[0])))
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void	(*_sighdlr[MAXSIG+1])(int, char*, Ureg*); /* 0 initialized: SIG_DFL */
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/* must match signal.h: extern void (*signal(int, void (*)()))(); */
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//void (*signal(int sig, void (*func)(int, char*, Ureg*)))(int, char*, Ureg*)
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void
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(*signal(int sig, void (*func)()))()
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{
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	void(*oldf)(int, char*, Ureg*);
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	if(sig <= 0 || sig > MAXSIG){
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		errno = EINVAL;
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		return SIG_ERR;
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	}
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	oldf = _sighdlr[sig];
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	if(sig == SIGKILL)
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		return oldf;	/* can't catch or ignore SIGKILL */
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	_sighdlr[sig] = func;
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	return oldf;
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}
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/* BAD CODE - see /sys/src/ape/lib/ap/$objtype/setjmp.s for real code
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int
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sigsetjmp(sigjmp_buf buf, int savemask)
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{
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	int r;
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	buf[0] = savemask;
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	buf[1] = _psigblocked;
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	return setjmp(&buf[2]);
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}
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*/
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/*
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 * BUG: improper handling of process signal mask
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 */
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int
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sigaction(int sig, struct sigaction *act, struct sigaction *oact)
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{
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	if(sig <= 0 || sig > MAXSIG || sig == SIGKILL){
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		errno = EINVAL;
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		return -1;
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	}
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	if(oact){
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		oact->sa_handler = _sighdlr[sig];
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		oact->sa_mask = _psigblocked;
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		oact->sa_flags = 0;
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	}
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	if(act){
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		_sighdlr[sig] = act->sa_handler;
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	}
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	return 0;
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}
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/* this is registered in _envsetup */
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int
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_notehandler(void *u, char *msg)
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{
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	int i;
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	void(*f)(int, char*, Ureg*);
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	extern void _doatexits(void);	/* in stdio/exit.c */
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	if(_finishing)
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		_finish(0, 0);
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	for(i = 0; i<NSIGTAB; i++){
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		if(strncmp(msg, sigtab[i].msg, strlen(sigtab[i].msg)) == 0){
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			f = _sighdlr[sigtab[i].num];
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			if(f == SIG_DFL || f == SIG_ERR)
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				break;
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			if(f != SIG_IGN) {
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				_notetramp(sigtab[i].num, f, u);
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				/* notetramp is machine-dependent; doesn't return to here */
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			}
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			_NOTED(0); /* NCONT */
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			return 0;
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		}
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	}
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	_doatexits();
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	_NOTED(1); /* NDFLT */
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	return 0;
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}
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int
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_stringsig(char *nam)
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{
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	int i;
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	for(i = 0; i<NSIGTAB; i++)
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		if(strncmp(nam, sigtab[i].msg, strlen(sigtab[i].msg)) == 0)
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			return sigtab[i].num;
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	return 0;
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}
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char *
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_sigstring(int sig)
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{
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	int i;
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	for(i=0; i<NSIGTAB; i++)
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		if(sigtab[i].num == sig)
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			return sigtab[i].msg;
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	return "unknown signal";
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}