UNLOCKPT(3C)UNLOCKPT(3C)NAME
unlockpt - unlock a pseudo-terminal master/slave pair
SYNOPSIS
#include <stdlib.h>
int unlockpt(int fildes);
DESCRIPTION
The unlockpt() function unlocks the slave pseudo-terminal device asso‐
ciated with the master to which fildes refers.
Portable applications must call unlockpt() before opening the slave
side of a pseudo-terminal device.
RETURN VALUES
Upon successful completion, unlockpt() returns 0. Otherwise, it returns
−1 and sets errno to indicate the error.
ERRORS
The unlockpt() function may fail if:
EBADF
The fildes argument is not a file descriptor open for writ‐
ing.
EINVAL
The fildes argument is not associated with a master pseudo-
terminal device.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────┤
│MT-Level │ Safe │
└────────────────────┴─────────────────┘
SEE ALSOopen(2), grantpt(3C), ptsname(3C), attributes(5), standards(5)
STREAMS Programming Guide
Aug 14, 2002 UNLOCKPT(3C)