138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
#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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{"term", SIGTERM},
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{"usr1", SIGUSR1},
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{"usr2", SIGUSR2},
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{"virtual alarm", SIGVTALRM},
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{"profiling alarm", SIGPROF},
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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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void
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(*signal(int sig, void (*func)(int, char*, Ureg*)))(int, char*, Ureg*)
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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(Ureg *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;
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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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}
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