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.\"	@(#)uname.3	8.1 (Berkeley) 1/4/94
.\" $FreeBSD: release/9.1.0/lib/libc/gen/uname.3 165903 2007-01-09 00:28:16Z imp $
.\"
.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 .