UNLOCKPT(3) Library Functions Manual UNLOCKPT(3)

unlockpt — unlock a pseudo-terminal master/slave pair


#include <stdlib.h>

int unlockpt(int fildes);

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

Conforming applications shall ensure that they call unlockpt () before opening the slave 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 master pseudo-terminal device.

None.

None.

None.

None.

grantpt(3), open(3), ptsname(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <stdlib.h>

First released in Issue 4, Version 2.

Moved from X/OPEN UNIX extension to BASE.

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

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January 1, 2004 posix.fail