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.\"     @(#)gethostname.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: src/lib/libc/gen/gethostname.3,v 1.5.2.6 2003/03/13 18:05:37 trhodes Exp $
.\" $DragonFly: src/lib/libc/gen/gethostname.3,v 1.2 2003/06/17 04:26:42 dillon Exp $
.\"
.Dd June 4, 1993
.Dt GETHOSTNAME 3
.Os
.Sh NAME
.Nm gethostname ,
.Nm sethostname
.Nd get/set name of current host
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn gethostname "char *name" "int namelen"
.Ft int
.Fn sethostname "const char *name" "int namelen"
.Sh DESCRIPTION
The
.Fn gethostname
function
returns the standard host name for the current processor, as
previously set by
.Fn sethostname .
The
.Fa namelen
argument
specifies the size of the
.Fa name
array.  The returned name is null-terminated unless insufficient
space is provided.
.Pp
The
.Fn sethostname
function
sets the name of the host machine to be
.Fa name ,
which has length
.Fa namelen .
This call is restricted to the super-user and
is normally used only when the system is bootstrapped.
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
The following errors may be returned by these calls:
.Bl -tag -width Er
.It Bq Er EFAULT
The
.Fa name
or
.Fa namelen
argument gave an
invalid address.
.It Bq Er EPERM
The caller tried to set the hostname and was not the super-user.
.El
.Sh SEE ALSO
.Xr gethostid 3 ,
.Xr sysctl 3
.Sh BUGS
Host names are limited to
.Dv MAXHOSTNAMELEN
(from
.Ao Pa sys/param.h Ac )
characters, currently 256.
This includes the trailing
.Dv NUL .
.Sh HISTORY
The
.Fn gethostname
function appeared in
.Bx 4.2 .