unlockpt(3)unlockpt(3)NAMEunlockpt - Unlock a pseudoterminal master and slave pair
SYNOPSIS
#include <stdlib.h>
int unlockpt(
int mastfd );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
unlockpt(): XSH5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Specifies a file descriptor that is returned from a successful open of
the master pseudoterminal device.
DESCRIPTION
The unlockpt() function unlocks a slave pseudoterminal from its associ‐
ated master counterpart. It does this by clearing a lock option so that
the slave device can be opened.
ERRORS
The unlockpt() function sets errno to the specified values for the fol‐
lowing conditions:
The file descriptor specified by the mastfd parameter is not an open
file descriptor. The file descriptor specified by the mastfd parameter
is not associated with a master pseudoterminal device.
RETURN VALUE
Upon successful completion, the unlockpt() function returns a value of
0. Otherwise, it returns a value of -1 and sets errno to indicate the
error.
SEE ALSO
Functions: openpty(3)
Standards: standards(5)unlockpt(3)
