trap.c - 9base - revived minimalist port of Plan 9 userland to Unix
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       ---
       trap.c (878B)
       ---
            1 #include "rc.h"
            2 #include "exec.h"
            3 #include "fns.h"
            4 #include "io.h"
            5 extern char *Signame[];
            6 
            7 void
            8 dotrap(void)
            9 {
           10         int i;
           11         struct var *trapreq;
           12         struct word *starval;
           13         starval = vlook("*")->val;
           14         while(ntrap) for(i = 0;i!=NSIG;i++) while(trap[i]){
           15                 --trap[i];
           16                 --ntrap;
           17                 if(getpid()!=mypid) Exit(getstatus());
           18                 trapreq = vlook(Signame[i]);
           19                 if(trapreq->fn){
           20                         start(trapreq->fn, trapreq->pc, (struct var *)0);
           21                         runq->local = newvar(strdup("*"), runq->local);
           22                         runq->local->val = copywords(starval, (struct word *)0);
           23                         runq->local->changed = 1;
           24                         runq->redir = runq->startredir = 0;
           25                 }
           26                 else if(i==SIGINT || i==SIGQUIT){
           27                         /*
           28                          * run the stack down until we uncover the
           29                          * command reading loop.  Xreturn will exit
           30                          * if there is none (i.e. if this is not
           31                          * an interactive rc.)
           32                          */
           33                         while(!runq->iflag) Xreturn();
           34                 }
           35                 else Exit(getstatus());
           36         }
           37 }