1.\" $NetBSD: gethostname.3,v 1.16 2005/10/14 23:53:41 christos Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 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.\" @(#)gethostname.3 8.1 (Berkeley) 6/4/93 31.\" 32.Dd October 14, 2005 33.Dt GETHOSTNAME 3 34.Os 35.Sh NAME 36.Nm gethostname , 37.Nm sethostname 38.Nd get/set name of current host 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In unistd.h 43.Ft int 44.Fn gethostname "char *name" "size_t namelen" 45.Ft int 46.Fn sethostname "const char *name" "size_t namelen" 47.Sh DESCRIPTION 48.Fn gethostname 49returns the standard host name for the current processor, as 50previously set by 51.Fn sethostname . 52The parameter 53.Fa namelen 54specifies the size of the 55.Fa name 56array. 57The returned name is null-terminated unless insufficient 58space is provided. 59.Pp 60.Fn sethostname 61sets the name of the host machine to be 62.Fa name , 63which has length 64.Fa namelen . 65This call is restricted to the super-user and 66is normally used only when the system is bootstrapped. 67.Sh RETURN VALUES 68If the call succeeds a value of 0 is returned. 69If the call fails, a value of \-1 is returned and an error code is 70placed in the global location 71.Va errno . 72.Sh ERRORS 73If the 74.Fn 75functions fail, 76they will set 77.Va errno 78for any of the errors specified for the routine 79.Xr sysctl 3 . 80.Sh SEE ALSO 81.Xr gethostid 3 , 82.Xr sysctl 3 , 83.Xr sysctl 8 84.Sh STANDARDS 85The 86.Fn gethostname 87function conforms to 88.St -xpg4.2 . 89.Sh HISTORY 90The 91.Nm 92function call appeared in 93.Bx 4.2 . 94.Sh BUGS 95Host names are limited to 96.Dv MAXHOSTNAMELEN 97(from 98.Ao Pa sys/param.h Ac ) 99characters including null-termination, currently 256. 100