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ape: improve setitimer

--- a/sys/src/ape/lib/bsd/getitimer.c

+++ b/sys/src/ape/lib/bsd/getitimer.c

@@ -21,7 +21,7 @@

 };

 void

-timerloop(Timer *timer, const struct timeval tval)

+timerloop(int signal, const struct timeval tval)

 {

 	pid_t ppid;

 	struct timespec t, s;

@@ -31,7 +31,7 @@

 	t.tv_nsec = tval.tv_usec*1000;

 	for(;;){

 		nanosleep(&t, &s);

-		kill(ppid, timer->signal);

+		kill(ppid, signal);

 	}

 }

@@ -64,7 +64,7 @@

 		errno = EFAULT;

 		return -1;

 	case 0:

-		timerloop(timer, new->it_interval);

+		timerloop(timer->signal, new->it_interval);

 		exit(0);

 	}

 	return 0;