mirror of https://github.com/mkerrisk/man-pages
48 lines
967 B
Groff
48 lines
967 B
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
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.\" This page is in the public domain. - aeb
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.\"
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.TH UNLOCKPT 3 "2003-01-30" "PTY Control" "Linux Programmer's Manual"
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.SH NAME
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unlockpt \- unlock a pseudo-terminal master/slave pair
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.SH SYNOPSIS
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.nf
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.B #define _XOPEN_SOURCE
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.br
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.B #include <stdlib.h>
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.sp
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.BI "int unlockpt(int " fd ");"
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.fi
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.SH DESCRIPTION
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The
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.IR unlockpt ()
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function unlocks the slave pseudo-terminal device
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(pty) corresponding to the master pty referred to by
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.IR fd .
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.PP
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.IR unlockpt ()
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should be called before opening the slave side of a pty.
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.SH "RETURN VALUE"
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When successful,
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.IR unlockpt ()
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returns 0. Otherwise, it returns \-1 and sets
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.I errno
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appropriately.
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.SH ERRORS
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.TP
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.B EBADF
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The
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.I fd
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argument is not a file descriptor open for writing.
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.TP
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.B EINVAL
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The
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.I fd
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argument is not associated with a master pty.
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.SH "CONFORMING TO"
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POSIX 1003.1-2001.
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.SH "SEE ALSO"
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.IR grantpt (3),
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.BR posix_openpt (3),
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.IR ptsname (3),
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.BR pts (4)
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