🚀 go-pugleaf

Has anyone had any luck with the PIOCPSINFO ioctl?
According to the 4.0.5 proc(4) man page:

>          void *p;
>          retval = ioctl(fildes, code, p);
>
>     The argument p is a generic pointer whose type depends on the specific
>     ioctl code.  Where not specifically mentioned below, its value should be
>     zero.  <sys/procfs.h> contains definitions of ioctl codes and data
>     structures used by the operations.
> ...
>   PIOCPSINFO
>     This returns miscellaneous process information such as that reported by
>     ps(1).  p is a pointer to a prpsinfo structure containing at least the
>     following fields:
>
>     typedef struct prpsinfo {
>	...
>     } prpsinfo_t


Enclosed is a program that demonstrates the failure of the PIOCPSINFO ioctl.

$ cc -o prps prps.c
$ prps				(uses getpid(), or give a PID as first arg)
prps: using path: /debug/12850
prst.pr_pid 12850
prps: ioctl PIOCPSINFO: Invalid argument

[IRIX stimpy 4.0.5 06151813 IP12]
[also compiled/tried under 4.0.4 and 4.0.5F]

Any and all insight appreciated.  Thanks!

- Bill Carson / brighton@pixar.com

--------------------------------------------------------------------

#include <sys/types.h>

#include <stdio.h>
#include <errno.h>
#include <malloc.h>
#include <string.h>
#include <fcntl.h>

#include <sys/time.h>
#include <sys/signal.h>
#include <sys/fault.h>
#include <sys/syscall.h>
#include <sys/procfs.h>

static char *PGM = "prps";
#define ERR sys_errlist[errno]

main(ac, av)
char **av;
{
	FILE *pf;
	int pid, ret, fd;
	char path[1024];
	prstatus_t prst;
	prpsinfo_t prps;
	void *v;

	if (ac > 1)
		pid = atoi(av[1]);
	else
		pid = getpid();
	
	sprintf(path, "/debug/%05d", pid);

	setbuf(stdout, NULL);
	printf("%s: using path: %s\n", PGM, path);

	if ((fd = open(path, O_RDONLY, 0)) < 0) {
		fprintf(stderr, "%s: open \"%s\": %s\n", PGM, path, ERR);
		exit(1);
	}

	if ((ret = ioctl(fd, PIOCSTATUS, &prst)) < 0) {
		fprintf(stderr, "%s: ioctl PIOCSTATUS: %s\n", PGM, ERR);
		exit(1);
	}

	printf("prst.pr_pid %d\n", prst.pr_pid);

	/*
	 * no matter what, this always fails with EINVAL
	 */
	if ((ret = ioctl(fd, PIOCPSINFO, &prps)) < 0) {
		fprintf(stderr, "%s: ioctl PIOCPSINFO: %s\n", PGM, ERR);
		exit(1);
	}

	printf("prps.pr_pid %d\n", prps.pr_pid);

	if (close(fd) < 0) {
		fprintf(stderr, "%s: close: %s\n", PGM, ERR);
		exit(1);
	}

	exit(0);
}