UNLOCKPT(3) Library Functions Manual UNLOCKPT(3)

unlockpt — unlock a pseudo-terminal manager/subsidiary pair


#include <stdlib.h>

int unlockpt(int fildes);

The unlockpt () function shall unlock the subsidiary pseudo-terminal device associated with the manager device to which refers.

Conforming applications shall ensure that they call unlockpt () before opening the subsidiary side of a pseudo-terminal device.

Upon successful completion, unlockpt () shall return 0. Otherwise, it shall return -1 and set to indicate the error.

The unlockpt () function may fail if:

The fildes argument is not a file descriptor open for writing.
The fildes argument is not associated with a manager pseudo-terminal device.

None.

None.

See the RATIONALE section for posix_openpt(3).

None.

grantpt(3), open(3), posix_openpt(3), ptsname(3)

XBD <stdlib.h>

First released in Issue 4, Version 2.

Moved from X/OPEN UNIX extension to BASE.

The normative text is updated to avoid use of the term "must" for application requirements.

POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0697 [96] is applied.

Austin Group Defect 1466 is applied, changing the terminology used for pseudo-terminal devices.

June 14, 2024 posix.fail