rs@mirror.UUCP (05/06/85)
What am I doing wrong? I have a little reminder that I want to
be able to set -- sort of like leave. I want it small and unobtrusive,
and I want to be able to say "alarm 10 'ten minutes are up'" I wrote
the obvious program (see below), but it ends up hogging all available
CPU time. If I take out the fork() call (#ifdef CPU_HOG) it doesn't
take up all the time? What's going on?
This only happens on BSD4.2; on Sys5, everything is ok.
Why am I taking up all the cycles?
#include <stdio.h>
#include <signal.h>
/* Linked in later. */
#ifndef lint
exit(X) { _exit(X); }
#endif lint
/* Sure-fire guaranteed file descriptors. */
#define STDIN 0
#define STDOUT 1
#define STDERR 2
/* Global variables. */
static char Usage[] = "usage: alarm delay 'message...'\n";
static char Buzzer[] = "\007\n\r";
main(ac, av)
int ac;
register char *av[];
{
register int Temp;
/* Parse JCL. */
if (ac < 3 || (Temp = atoi(av[1])) <= 0)
{
(void)write(STDERR, Usage, sizeof(Usage));
return(1);
}
(void)close(STDIN);
(void)close(STDOUT);
#ifdef CPU_HOG
if (fork() == 0)
#endif CPU_HOG
{
av += 2;
/* Now I lay me down to sleep... */
(void)signal(SIGINT, SIG_IGN);
(void)sleep((unsigned)Temp * 60);
(void)write(STDERR, Buzzer, sizeof(Buzzer));
(void)write(STDERR, *av, strlen(*av));
(void)write(STDERR, Buzzer, sizeof(Buzzer));
}
return(0);
}
thanks.
--------
Rich $alz
Mirror Systems
2067 Massachusetts Ave. Cambridge, MA 02150
617/661-0777
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