Does SIGXCPU work under AIX 3.1?

[Vic Abell]

The attached test program works under BSD 4.3-Tahoe, Ultrix 2.2, SunOS
4.0.3, NeXTOS 1.0 and DYNIX 3.0.12.   It doesn't work under AIX 3.1
(3003).  What else do I need do to limit CPU time?

Csh's "limit cputime nnn" command doesn't seem to work, either.

Vic Abell <abe at mace.cc.purdue.edu>

#include <stdio.h>
#include <signal.h>
#include <sys/resource.h>

#define TIMEOUT	20
#define	NEWLIM	1

void
cpulim()
{
	(void) fprintf(stderr, "CPU time limit signal received\n");
	exit(0);
}

void
timeout()
{
	(void) fprintf(stderr, "%d second alarm rang\n", TIMEOUT);
	exit(1);
}

main()
{
	struct rlimit r;

	if (getrlimit(RLIMIT_CPU, &r) != 0) {
		perror("getrlimit(RLIMIT_CPU)");
		exit(1);
	}
	(void) fprintf(stderr, "current (soft) RLIMIT_CPU = %d\n", r.rlim_cur);
	r.rlim_cur = NEWLIM;
	if (setrlimit(RLIMIT_CPU, &r) != 0) {
		perror("setrlimit(RLIMIT_CPU)");
		exit(1);
	}
	(void) fprintf(stderr, "new (soft) RLIMIT_CPU = %d\n", NEWLIM);
	(void) signal (SIGALRM, timeout);
	(void) signal(SIGXCPU, cpulim);
	alarm(TIMEOUT);
	for(;;)
		;
/* NOTREACHED */
}