blob: 953dbbb721ae3f15f7ccb5dd0c865773a6d3ca2e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
'\" t
.\" %%%LICENSE_START(PUBLIC_DOMAIN)
.\" This page is in the public domain. - aeb
.\" %%%LICENSE_END
.\"
.TH unlockpt 3 2023-03-30 "Linux man-pages 6.04"
.SH NAME
unlockpt \- unlock a pseudoterminal master/slave pair
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B #define _XOPEN_SOURCE
.B #include <stdlib.h>
.PP
.BI "int unlockpt(int " fd );
.fi
.PP
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.PP
.BR unlockpt ():
.nf
Since glibc 2.24:
_XOPEN_SOURCE >= 500
.\" || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
glibc 2.23 and earlier:
_XOPEN_SOURCE
.fi
.SH DESCRIPTION
The
.BR unlockpt ()
function unlocks the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by the file descriptor
.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
to indicate the error.
.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 ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.BR unlockpt ()
T} Thread safety MT-Safe
.TE
.hy
.ad
.sp 1
.SH STANDARDS
POSIX.1-2008.
.SH HISTORY
glibc 2.1.
POSIX.1-2001.
.SH SEE ALSO
.BR grantpt (3),
.BR posix_openpt (3),
.BR ptsname (3),
.BR pts (4),
.BR pty (7)
|
