#include	<stdio.h>
#include	<pwd.h>
#include	<grp.h>

#define	pwd	struct passwd
#define	grp	struct group

void
main()
{
  register int    u;		/* uid_t */

  register int    g;		/* gid_t */

  register pwd   *pw;

  register grp   *gr;

  pw = getpwuid(u = (int) getuid());
  (void) printf("getuid returned %d (%s)\n",
		(int) u, pw == (pwd *) 0 ? "NONAME" : pw->pw_name);
  pw = getpwuid(u = (int) geteuid());
  (void) printf("geteuid returned %d (%s)\n",
		(int) u, pw == (pwd *) 0 ? "NONAME" : pw->pw_name);
  gr = getgrgid(g = (int) getgid());
  (void) printf("getgid returned %d (%s)\n",
		(int) g, gr == (grp *) 0 ? "NONAME" : gr->gr_name);
  gr = getgrgid(g = (int) getegid());
  (void) printf("getegid returned %d (%s)\n",
		(int) g, gr == (grp *) 0 ? "NONAME" : gr->gr_name);
}