The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.
A newer edition of this document exists here

NAME

unlockpt - unlock a pseudo-terminal master/slave pair

SYNOPSIS

[XSI] [Option Start] #include <stdlib.h>

int unlockpt(int fildes); [Option End]

DESCRIPTION

The unlockpt() function shall unlock the slave pseudo-terminal device associated with the master to which fildes refers.

Conforming applications shall ensure that they call unlockpt() before opening the slave side of a pseudo-terminal device.

RETURN VALUE

Upon successful completion, unlockpt() shall return 0. Otherwise, it shall return -1 and set errno to indicate the error.

ERRORS

The unlockpt() function may fail if:

[EBADF]
The fildes argument is not a file descriptor open for writing.
[EINVAL]
The fildes argument is not associated with a master pseudo-terminal device.
The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

grantpt(), open(), ptsname(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

CHANGE HISTORY

First released in Issue 4, Version 2.

Issue 5

Moved from X/OPEN UNIX extension to BASE.

Issue 6

The DESCRIPTION is updated to avoid use of the term "must" for application requirements.

End of informative text.
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