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