.\" Copyright (c) 1994
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd December 2, 2005
.Dt UNAME 3
.Os
.Sh NAME
.Nm uname
.Nd get system identification
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/utsname.h
.Ft int
.Fn uname "struct utsname *name"
.Sh DESCRIPTION
The
.Fn uname
function stores
.Dv NUL Ns -terminated
strings of information identifying
the current system into the structure referenced by
.Fa name .
.Pp
The
.Vt utsname
structure is defined in the
.In sys/utsname.h
header file, and contains the following members:
.Bl -tag -width nodenameXXXX -offset indent
.It sysname
Name of the operating system implementation.
.It nodename
Network name of this machine.
.It release
Release level of the operating system.
.It version
Version level of the operating system.
.It machine
Machine hardware platform.
.El
.Sh RETURN VALUES
.Rv -std uname
.Sh ENVIRONMENT
.Bl -tag -width ".Ev UNAME_s"
.It Ev UNAME_s
If the environment variable
.Ev UNAME_s
is set, it will override the
.Va sysname
member.
.It Ev UNAME_r
If the environment variable
.Ev UNAME_r
is set, it will override the
.Va release
member.
.It Ev UNAME_v
If the environment variable
.Ev UNAME_v
is set, it will override the
.Va version
member.
.It Ev UNAME_m
If the environment variable
.Ev UNAME_m
is set, it will override the
.Va machine
member.
.El
.Sh ERRORS
The
.Fn uname
function may fail and set
.Va errno
for any of the errors specified for the library functions
.Xr sysctl 3 .
.Sh SEE ALSO
.Xr uname 1 ,
.Xr sysctl 3
.Sh STANDARDS
The
.Fn uname
function conforms to
.St -p1003.1-88 .
.Sh HISTORY
The
.Fn uname
function first appeared in
.Bx 4.4 .