1.\" $OpenBSD: uname.3,v 1.19 2023/10/09 19:32:51 schwarze Exp $ 2.\" 3.\" Copyright (c) 1994 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd $Mdocdate: October 9 2023 $ 31.Dt UNAME 3 32.Os 33.Sh NAME 34.Nm uname 35.Nd get system identification 36.Sh SYNOPSIS 37.In sys/utsname.h 38.Ft int 39.Fn uname "struct utsname *name" 40.Sh DESCRIPTION 41The 42.Fn uname 43function stores NUL-terminated strings of information identifying 44the current system into the structure referenced by 45.Fa name . 46.Pp 47The 48.Vt utsname 49structure is defined in the 50.In sys/utsname.h 51header file, and contains the following members: 52.Pp 53.Bl -tag -width nodenameXXXX -offset indent -compact 54.It Fa sysname 55Name of the operating system implementation. 56.It Fa nodename 57Network name of this machine. 58.It Fa release 59Release level of the operating system. 60.It Fa version 61Version level of the operating system. 62.It Fa machine 63Machine hardware platform. 64.El 65.Pp 66These are the same strings that can be displayed with 67.Xr uname 1 . 68Because their format and meaning depends on the operating system, 69trying to parse or interpret them is discouraged in portable code. 70The only reasonable way an application program can use them 71is for displaying them to the user. 72.Sh RETURN VALUES 73The 74.Fn uname 75function returns a non-negative value if successful; 76otherwise the value -1 is returned and the global variable 77.Va errno 78is set to indicate the error. 79.Sh ERRORS 80The 81.Fn uname 82function may fail and set 83.Va errno 84for any of the errors specified for the library function 85.Xr sysctl 2 . 86.Sh SEE ALSO 87.Xr uname 1 , 88.Xr sysctl 2 89.Sh STANDARDS 90The 91.Fn uname 92function conforms to 93.St -p1003.1-88 . 94.Sh HISTORY 95The 96.Fn uname 97function first appeared in PWB/UNIX 1.0 98and was reimplemented for 99.Bx 4.4 . 100