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.\"     @(#)gethostname.3	8.1 (Berkeley) 6/4/93
.\"
.Dd September 2, 2015
.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" "size_t namelen"
.Sh DESCRIPTION
.Fn gethostname
returns the standard host name for the current machine, as
previously set by
.Fn sethostname .
The parameter
.Fa namelen
specifies the size of the
.Fa name
array.
The returned name is null-terminated unless insufficient
space is provided.
.Pp
.Fn sethostname
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
If the call succeeds a value of 0 is returned.
If the call fails, a value of \-1 is returned and an error code is
placed in the global location
.Va errno .
.Sh ERRORS
If the
.Fn gethostname
or
.Fn sethostname
functions fail,
they will set
.Va errno
for any of the errors specified for the routine
.Xr sysctl 3 .
.Sh SEE ALSO
.Xr gethostid 3 ,
.Xr sysctl 3 ,
.Xr sysctl 8
.Sh STANDARDS
The
.Fn gethostname
function conforms to
.St -xpg4.2 .
.Sh HISTORY
The
.Nm
function call appeared in
.Bx 4.2 .
.Sh BUGS
Host names are limited to
.Dv MAXHOSTNAMELEN
(from
.Ao Pa sys/param.h Ac )
characters including null-termination, currently 256.