unlockpt(3) Library Functions Manual unlockpt(3)
NAME
unlockpt - Unlocks a pseudoterminal master and slave pair
LIBRARY
Standard C Library (libc)
SYNOPSIS
#include <stdlib.h>
int unlockpt( int mastfd);
STANDARDS
Interfaces documented on this reference page conform to industry standards 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 associated master counterpart. It does this by clearing a lock flag so
that the slave device can be opened.
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.
ERRORS
The unlockpt() function sets errno to the specified values for the following conditions:
The file descriptor specified by the mastfd parameter is not an open file descriptor. The file descriptor specified by the mastfd parame-
ter is not associated with a master pseudoterminal device.
RELATED INFORMATION
Functions: openpty(3)
Standards: standards(5) delim off
unlockpt(3)
