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UNLOCKPT

Section: Linux Programmer's Manual (3)
Updated: 2008-06-14
Index Return to Main Contents

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NAME

unlockpt - unlock a pseudoterminal master/slave pair  

SYNOPSIS

#define _XOPEN_SOURCE       /* See feature_test_macros(7) */


#include <stdlib.h>

int unlockpt(int fd);

 

DESCRIPTION

The unlockpt() function unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by fd.

unlockpt() should be called before opening the slave side of a pseudoterminal.  

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 pseudoterminal.

 

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), pty(7)  

COLOPHON

This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

VERSIONS

CONFORMING TO

SEE ALSO

COLOPHON

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