mirror of https://github.com/mkerrisk/man-pages
66 lines
1.3 KiB
Groff
66 lines
1.3 KiB
Groff
.\" %%%LICENSE_START(PUBLIC_DOMAIN)
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.\" This page is in the public domain. - aeb
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.\" %%%LICENSE_END
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.\"
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.TH UNLOCKPT 3 2015-08-08 "" "Linux Programmer's Manual"
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.SH NAME
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unlockpt \- unlock a pseudoterminal master/slave pair
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.SH SYNOPSIS
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.nf
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.BR "#define _XOPEN_SOURCE" " /* See feature_test_macros(7) */"
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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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.BR unlockpt ()
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function unlocks the slave pseudoterminal device
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corresponding to the master pseudoterminal referred to by
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.IR fd .
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.PP
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.BR unlockpt ()
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should be called before opening the slave side of a pseudoterminal.
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.SH RETURN VALUE
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When successful,
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.BR unlockpt ()
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returns 0.
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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 pseudoterminal.
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.SH VERSIONS
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.BR unlockpt ()
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is provided in glibc since version 2.1.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lb lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR unlockpt ()
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T} Thread safety MT-Safe
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.TE
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.SH CONFORMING TO
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POSIX.1-2001, POSIX.1-2008.
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.SH SEE ALSO
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.BR grantpt (3),
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.BR posix_openpt (3),
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.BR ptsname (3),
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.BR pts (4),
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.BR pty (7)
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