unlockpt
int unlockpt(int);
if (unlockpt(mfd) < 0) {
if (unlockpt(p) == -1)
if (unlockpt(p) == -1)
unlockpt(*cntrl) < 0) {
int unlockpt(int fd);
unlockpt(manager); /* unlock subsidiary */
int unlockpt();
if (unlockpt(masterfd) != 0) {
extern int unlockpt(int);
if ((ret = unlockpt(fd)) == 0) {
if (grantpt(mfd) != 0 || unlockpt(mfd) != 0) {