#include "lib.h"
#include <string.h>
#include <stdlib.h>
#include <fmt.h>
#include "sys9.h"
#include "dir.h"

/*
 * Format:
  3 r  M    4 (0000000000457def 11 00)   8192      512 /rc/lib/rcmain
 */

int
_IOUNIT(int fd)
{
	int i, cfd;
	char buf[128], *args[10];

	snprint(buf, sizeof buf, "#d/%dctl", fd);
	cfd = _OPEN(buf, OREAD);
	if(cfd < 0)
		return 0;
	i = _READ(cfd, buf, sizeof buf-1);
	_CLOSE(cfd);
	if(i <= 0)
		return 0;
	buf[i] = '\0';
	if(getfields(buf, args, 10, 1, " \t") != 10)
		return 0;
	return atoi(args[7]);
}