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.\" 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. .\" 4. 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. .\" .\" @(#)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 .