Linux 2.6 - man page for unlockpt (linux section 3posix)
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UNLOCKPT(P) POSIX Programmer's Manual UNLOCKPT(P)
unlockpt - unlock a pseudo-terminal master/slave pair
int unlockpt(int fildes);
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.
Upon successful completion, unlockpt() shall return 0. Otherwise, it shall return -1 and
set errno to indicate the error.
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.
grantpt() , open() , ptsname() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 UNLOCKPT(P)
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