136 lines
3.8 KiB
Groff
136 lines
3.8 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
|
|
.\" 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.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)gethostname.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 18, 2003
|
|
.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" "size_t 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.
|
|
.Pp
|
|
Host names are limited to
|
|
.Brq Dv HOST_NAME_MAX
|
|
characters, not including the trailing null, currently 255.
|
|
.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 ENAMETOOLONG
|
|
The current host name is longer than
|
|
.Fa namelen .
|
|
(For
|
|
.Fn gethostname
|
|
only.)
|
|
.It Bq Er EPERM
|
|
The caller tried to set the host name and was not the super-user.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr sysconf 3 ,
|
|
.Xr sysctl 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn gethostname
|
|
function conforms to
|
|
.St -p1003.1-2001 .
|
|
Callers should be aware that
|
|
.Brq Dv HOST_NAME_MAX
|
|
may be variable or infinite, but is guaranteed to be no less than
|
|
.Brq Dv _POSIX_HOST_NAME_MAX .
|
|
On older systems, this limit was defined in the non-standard header
|
|
.In sys/param.h
|
|
as
|
|
.Dv MAXHOSTNAMELEN ,
|
|
and counted the terminating null.
|
|
The
|
|
.Fn sethostname
|
|
function and the error returns for
|
|
.Fn gethostname
|
|
are not standardized.
|
|
.Sh HISTORY
|
|
The
|
|
.Fn gethostname
|
|
function appeared in
|
|
.Bx 4.2 .
|
|
The
|
|
.Fa namelen
|
|
argument to
|
|
.Fn gethostname
|
|
was changed to
|
|
.Vt size_t
|
|
in
|
|
.Fx 5.2
|
|
for alignment with
|
|
.St -p1003.1-2001 .
|