Unlocks a pseudo-terminal device.
Standard C Library (libc.a)
#include <stdlib.h>int unlockpt ( FileDescriptor)
int FileDescriptor;
The unlockpt subroutine unlocks the slave peudo-terminal device associated with the master peudo-terminal device defined by the FileDescriptor parameter. This subroutine has no effect if the environment variable XPG_SUS_ENV is not set equal to the string "ON", or if the BSD PTY driver is used.
| Item | Description |
|---|---|
| FileDescriptor | Specifies the file descriptor of the master pseudo-terminal device. |
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and the errno global variable is set to indicate the error.