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[linuxjm/LDP_man-pages.git] / original / man3 / unlockpt.3

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-.\" %%%LICENSE_START(PUBLIC_DOMAIN)
-.\" This page is in the public domain. - aeb
-.\" %%%LICENSE_END
-.\"
-.TH UNLOCKPT 3 2013-12-09 "" "Linux Programmer's Manual"
-.SH NAME
-unlockpt \- unlock a pseudoterminal master/slave pair
-.SH SYNOPSIS
-.nf
-.BR "#define _XOPEN_SOURCE" "       /* See feature_test_macros(7) */"
-.br
-.B #include <stdlib.h>
-.sp
-.BI "int unlockpt(int " fd ");"
-.fi
-.SH DESCRIPTION
-The
-.BR unlockpt ()
-function unlocks the slave pseudoterminal device
-corresponding to the master pseudoterminal referred to by
-.IR fd .
-.PP
-.BR unlockpt ()
-should be called before opening the slave side of a pseudoterminal.
-.SH RETURN VALUE
-When successful,
-.BR unlockpt ()
-returns 0.
-Otherwise, it returns \-1 and sets
-.I errno
-appropriately.
-.SH ERRORS
-.TP
-.B EBADF
-The
-.I fd
-argument is not a file descriptor open for writing.
-.TP
-.B EINVAL
-The
-.I fd
-argument is not associated with a master pseudoterminal.
-.SH VERSIONS
-.BR unlockpt ()
-is provided in glibc since version 2.1.
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR unlockpt ()
-function is thread-safe.
-.SH CONFORMING TO
-POSIX.1-2001.
-.SH SEE ALSO
-.BR grantpt (3),
-.BR posix_openpt (3),
-.BR ptsname (3),
-.BR pts (4),
-.BR pty (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.