26 .\"
27 .\" The contents of this file are subject to the terms of the
28 .\" Common Development and Distribution License (the "License").
29 .\" You may not use this file except in compliance with the License.
30 .\"
31 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
32 .\" or http://www.opensolaris.org/os/licensing.
33 .\" See the License for the specific language governing permissions
34 .\" and limitations under the License.
35 .\"
36 .\" When distributing Covered Code, include this CDDL HEADER in each
37 .\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
38 .\" If applicable, add the following below this CDDL HEADER, with the
39 .\" fields enclosed by brackets "[]" replaced with your own identifying
40 .\" information: Portions Copyright [yyyy] [name of copyright owner]
41 .\"
42 .\"
43 .\" Copyright 1989 AT&T
44 .\" Portions Copyright (c) 1994, X/Open Company Limited. All Rights Reserved.
45 .\" Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
46 .\"
47 .TH GRANTPT 3C "Aug 14, 2006"
48 .SH NAME
49 grantpt \- grant access to the slave pseudo-terminal device
50 .SH SYNOPSIS
51 .LP
52 .nf
53 #include <stdlib.h>
54
55 \fBint\fR \fBgrantpt\fR(\fBint\fR \fIfildes\fR);
56 .fi
57
58 .SH DESCRIPTION
59 .sp
60 .LP
61 The \fBgrantpt()\fR function changes the mode and ownership of the slave
62 pseudo-terminal device associated with its master pseudo-terminal counterpart.
63 \fIfildes\fR is the file descriptor returned from a successful open of the
64 master pseudo-terminal device. The user ID of the slave is set to the real UID
65 of the calling process and the group ID is set to a reserved group. The
66 permission mode of the slave pseudo-terminal is set to readable and writable by
67 the owner and writable by the group.
68 .SH RETURN VALUES
69 .sp
70 .LP
71 Upon successful completion, \fBgrantpt()\fR returns \fB0\fR. Otherwise, it
72 returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
73 .SH ERRORS
74 .sp
75 .LP
76 The \fBgrantpt()\fR function may fail if:
77 .sp
78 .ne 2
79 .na
80 \fB\fBEBADF\fR\fR
81 .ad
82 .RS 10n
83 The \fIfildes\fR argument is not a valid open file descriptor.
84 .RE
85
86 .sp
87 .ne 2
88 .na
89 \fB\fBEINVAL\fR\fR
90 .ad
91 .RS 10n
92 The \fIfildes\fR argument is not associated with a master pseudo-terminal
93 device.
94 .RE
95
96 .sp
97 .ne 2
98 .na
99 \fB\fBEACCES\fR\fR
100 .ad
101 .RS 10n
102 The corresponding slave pseudo-terminal device could not be accessed.
103 .RE
104
105 .SH ATTRIBUTES
106 .sp
107 .LP
108 See \fBattributes\fR(5) for descriptions of the following attributes:
109 .sp
110
111 .sp
112 .TS
113 box;
114 c | c
115 l | l .
116 ATTRIBUTE TYPE ATTRIBUTE VALUE
117 _
118 Interface Stability Standard
119 _
120 MT-Level Safe
121 .TE
122
123 .SH SEE ALSO
124 .sp
125 .LP
126 \fBopen\fR(2), \fBptsname\fR(3C), \fBunlockpt\fR(3C), \fBattributes\fR(5),
127 \fBstandards\fR(5)
128 .sp
129 .LP
130 \fISTREAMS Programming Guide\fR
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26 .\"
27 .\" The contents of this file are subject to the terms of the
28 .\" Common Development and Distribution License (the "License").
29 .\" You may not use this file except in compliance with the License.
30 .\"
31 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
32 .\" or http://www.opensolaris.org/os/licensing.
33 .\" See the License for the specific language governing permissions
34 .\" and limitations under the License.
35 .\"
36 .\" When distributing Covered Code, include this CDDL HEADER in each
37 .\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
38 .\" If applicable, add the following below this CDDL HEADER, with the
39 .\" fields enclosed by brackets "[]" replaced with your own identifying
40 .\" information: Portions Copyright [yyyy] [name of copyright owner]
41 .\"
42 .\"
43 .\" Copyright 1989 AT&T
44 .\" Portions Copyright (c) 1994, X/Open Company Limited. All Rights Reserved.
45 .\" Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
46 .\" Copyright 2022 Oxide Computer Company
47 .\"
48 .Dd February 5, 2022
49 .Dt GRANTPT 3C
50 .Os
51 .Sh NAME
52 .Nm grantpt
53 .Nd grant access to the subsidiary device of a pseudo-terminal
54 .Sh SYNOPSIS
55 .In stdlib.h
56 .Ft int
57 .Fo grantpt
58 .Fa "int fildes"
59 .Fc
60 .Sh DESCRIPTION
61 The
62 .Fn grantpt
63 function changes the mode and ownership of the pseudo-terminal subsidiary
64 device associated with its pseudo-terminal manager counterpart.
65 .Pp
66 The
67 .Fa fildes
68 argument is the file descriptor returned from a successful
69 .Xr open 2
70 of the pseudo-terminal manager device; e.g., by calling
71 .Xr posix_openpt 3C
72 or by performing an
73 .Xr open 2
74 of the
75 .Xr ptm 7D
76 device.
77 .Pp
78 The user ID owner of the subsidiary device is set to the real user ID of the
79 calling process.
80 The group ID owner is set to a reserved group.
81 .Pp
82 The permission mode of the subsidiary device is set to be readable and writable
83 by the owner, and writable by the group.
84 .Sh RETURN VALUES
85 .Rv -std grantpt
86 .Sh EXAMPLES
87 See
88 .Xr posix_openpt 3C
89 for an example that includes a call to
90 .Fn grantpt .
91 .Sh ERRORS
92 The
93 .Fn grantpt
94 function may fail if:
95 .Bl -tag -width Er
96 .It Er EBADF
97 The
98 .Fa fildes
99 argument is not a valid open file descriptor.
100 .It Er EINVAL
101 The
102 .Fa fildes
103 argument is not associated with a pseudo-terminal manager device.
104 .It Er EACCES
105 The corresponding pseudo-terminal subsidiary device could not be accessed.
106 .El
107 .Sh INTERFACE STABILITY
108 .Sy Committed
109 .Sh MT LEVEL
110 .Sy Safe
111 .Sh SEE ALSO
112 .Xr open 2 ,
113 .Xr posix_openpt 3C ,
114 .Xr ptsname 3C ,
115 .Xr unlockpt 3C ,
116 .Xr attributes 5 ,
117 .Xr standards 5 ,
118 .Xr ptm 7D
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