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unlockpt

man page of unlockpt

unlockpt: unlock a pseudo-terminal master/slave pair

NAME

unlockpt - unlock a pseudo-terminal master/slave pair
SYNOPSIS
#define _XOPEN_SOURCE #include <stdlib.h> int unlockpt(int fd);
DESCRIPTION
The unlockpt() function unlocks the slave pseudo-terminal device (pty) corresponding to the master pty referred to by fd. unlockpt() should be called before opening the slave side of a pty.

RETURN VALUE

When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately.

ERRORS

EBADF The fd argument is not a file descriptor open for writing. EINVAL The fd argument is not associated with a master pty.

VERSIONS

unlockpt() is provided in glibc since version 2.1.

CONFORMING TO

POSIX.1-2001.
SEE ALSO
grantpt(3), posix_openpt(3), ptsname(3), pts(4), feature_test_macros(7), pty(7)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at //www.kernel.org/doc/man-pages/. 2008-06-14 UNLOCKPT(3)
 
 
 

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