1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 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 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)gethostname.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD$ 34.\" 35.Dd June 4, 1993 36.Dt GETHOSTNAME 3 37.Os 38.Sh NAME 39.Nm gethostname , 40.Nm sethostname 41.Nd get/set name of current host 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In unistd.h 46.Ft int 47.Fn gethostname "char *name" "int namelen" 48.Ft int 49.Fn sethostname "const char *name" "int namelen" 50.Sh DESCRIPTION 51The 52.Fn gethostname 53function 54returns the standard host name for the current processor, as 55previously set by 56.Fn sethostname . 57The 58.Fa namelen 59argument 60specifies the size of the 61.Fa name 62array. The returned name is null-terminated unless insufficient 63space is provided. 64.Pp 65The 66.Fn sethostname 67function 68sets the name of the host machine to be 69.Fa name , 70which has length 71.Fa namelen . 72This call is restricted to the super-user and 73is normally used only when the system is bootstrapped. 74.Sh RETURN VALUES 75.Rv -std 76.Sh ERRORS 77The following errors may be returned by these calls: 78.Bl -tag -width Er 79.It Bq Er EFAULT 80The 81.Fa name 82or 83.Fa namelen 84argument gave an 85invalid address. 86.It Bq Er EPERM 87The caller tried to set the hostname and was not the super-user. 88.El 89.Sh SEE ALSO 90.Xr gethostid 3 , 91.Xr sysctl 3 92.Sh BUGS 93Host names are limited to 94.Dv MAXHOSTNAMELEN 95(from 96.Ao Pa sys/param.h Ac ) 97characters, currently 256. 98This includes the trailing 99.Dv NUL . 100.Sh HISTORY 101The 102.Fn gethostname 103function appeared in 104.Bx 4.2 . 105