* kill - send signal to process
register signo
, pid
, res
;
extern char *sys_errlist
[];
printf("usage: kill [ -signo ] pid ...\n");
if (**argv
<'0' || **argv
>'9')
res
= kill(pid
= atoi(*argv
), signo
);
printf("%u: %s\n", pid
, sys_errlist
[errno
]);