1.\" Copyright (c) 1983, 1991 The Regents of the University of California. 2.\" 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.2 6.7 (Berkeley) 3/10/91 33.\" 34.Dd March 10, 1991 35.Dt GETHOSTNAME 2 36.Os BSD 4.2 37.Sh NAME 38.Nm gethostname , 39.Nm sethostname 40.Nd get/set name of current host 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Ft int 44.Fn gethostname "char *name" "int namelen" 45.Ft int 46.Fn sethostname "const char *name" "int 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. The returned name is null-terminated unless insufficient 57space is provided. 58.Pp 59.Fn Sethostname 60sets the name of the host machine to be 61.Fa name , 62which has length 63.Fa namelen . 64This call is restricted to the super-user and 65is normally used only when the system is bootstrapped. 66.Sh RETURN VALUES 67If the call succeeds a value of 0 is returned. If the call 68fails, a value of -1 is returned and an error code is 69placed in the global location 70.Va errno . 71.Sh ERRORS 72The following errors may be returned by these calls: 73.Bl -tag -width Er 74.It Bq Er EFAULT 75The 76.Fa name 77or 78.Fa namelen 79parameter gave an 80invalid address. 81.It Bq Er EPERM 82The caller tried to set the hostname and was not the super-user. 83.El 84.Sh SEE ALSO 85.Xr gethostid 2 86.Sh BUGS 87Host names are limited to 88.Dv MAXHOSTNAMELEN 89(from 90.Ao Pa sys/param.h Ac ) 91characters, currently 64. 92.Sh HISTORY 93The 94.Nm 95function call appeared in 96.Bx 4.2 . 97