#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <sys/mman.h>

int main(int argc, char *argv[])
{
  struct passwd *pw;

  if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
    fprintf(stderr, "%s: mlockall failed: %s\n",
            argv[0], strerror(errno));
  }
  if (argc != 2) return 1;
  errno = 0;
  pw = getpwnam(argv[1]);
  if (pw == NULL) {
    fprintf(stderr, "%s: getpwnam failed: %s\n",
            argv[0], strerror(errno));
    return 1;
  }
  fprintf(stdout, "uid=%u gid=%u\n",
          (unsigned int)pw->pw_uid, (unsigned int)pw->pw_gid);
  fflush(stdout);
  return 0;
}