KCMP_FILE
KCMP_FILE, args->fd, args->arg);
type = KCMP_FILE;
case KCMP_FILE:
#ifndef KCMP_FILE
int rc = syscall(__NR_kcmp, parent, parent, KCMP_FILE, fd, fd);
EXPECT_OK(syscall(__NR_kcmp, parent, child, KCMP_FILE, fd, fd));
EXPECT_NE(0, syscall(__NR_kcmp, parent, child, KCMP_FILE, fd, fd));