- (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, (ioctl_t) 0);
- (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, (ioctl_t) 0);
- (void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, (ioctl_t) 0);
- (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, (ioctl_t) 0);
+ (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL);
+ (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL);
+ (void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, NULL);
+ (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL);