2 .\" Copyright (c) 2020 Soumendra Ganguly <soumendraganguly@gmail.com>
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
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13 .\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
14 .\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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25 .\" Portions of this text are reprinted and reproduced in electronic form
26 .\" from P1003.1-202x, Draft 1.1, Draft Standard for Information Technology --
27 .\" Portable Operating System Interface (POSIX), The Open Group Base
28 .\" Specifications Issue 8, Copyright (C) 2020 by the Institute of
29 .\" Electrical and Electronics Engineers, Inc and The Open Group. In the
30 .\" event of any discrepancy between this version and the original IEEE and
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43 .Nd get, set the size of a terminal window
50 unsigned short ws_row; /* number of rows, in characters */
51 unsigned short ws_col; /* number of columns, in characters */
52 unsigned short ws_xpixel; /* horizontal size, in pixels */
53 unsigned short ws_ypixel; /* vertical size, in pixels */
58 .Fn tcgetwinsize "int fd" "struct winsize *w"
60 .Fn tcsetwinsize "int fd" "const struct winsize *w"
64 function gets the terminal window size of the terminal of which
66 is an open file descriptor and stores it in the
74 function sets the terminal window size of the terminal of which
76 is an open file descriptor from the
78 structure referenced by
80 The change occurs immediately.
81 If the terminal window size of the terminal
82 is changed successfully to have a value that is different from the value that
87 signal is sent to all those members of the foreground process group of the
88 terminal that have the terminal as their controlling terminal.
90 The above declaration of
93 It is provided only to list the accessible members.
94 Therefore, before calling
98 structure must be initialized by calling
102 structure is stored by the kernel in order to provide a consistent interface,
103 but it is not used by the kernel.
105 .Rv -std tcgetwinsize tcsetwinsize
106 The terminal window size remains unchanged if
111 The following are the possible failure conditions:
120 is not a valid file descriptor.
128 is not associated with a character special device.
142 points outside the process's allocated address space.
155 functions are expected to conform to
157 Base Specifications, Issue 8.
164 are FreeBSD extensions.