harvey/sys/src/cmd/rc/trap.c

/*
 * This file is part of the UCB release of Plan 9. It is subject to the license
 * terms in the LICENSE file found in the top-level directory of this
 * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
 * part of the UCB release of Plan 9, including this file, may be copied,
 * modified, propagated, or distributed except according to the terms contained
 * in the LICENSE file.
 */

#include "rc.h"
#include "exec.h"
#include "fns.h"
#include "io.h"
extern char *Signame[];

void
dotrap(void)
{
	int i;
	struct var *trapreq;
	struct word *starval;
	starval = vlook("*")->val;
	while(ntrap) for(i = 0;i!=NSIG;i++) while(trap[i]){
		--trap[i];
		--ntrap;
		if(getpid()!=mypid) Exit(getstatus());
		trapreq = vlook(Signame[i]);
		if(trapreq->fn){
			start(trapreq->fn, trapreq->pc, (struct var *)0);
			runq->local = newvar(strdup("*"), runq->local);
			runq->local->val = copywords(starval, (struct word *)0);
			runq->local->changed = 1;
			runq->redir = runq->startredir = 0;
		}
		else if(i==SIGINT || i==SIGQUIT){
			/*
			 * run the stack down until we uncover the
			 * command reading loop.  Xreturn will exit
			 * if there is none (i.e. if this is not
			 * an interactive rc.)
			 */
			while(!runq->iflag) Xreturn();
		}
		else Exit(getstatus());
	}
}