gno/usr.man/man3/gethostname.3

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.\"     @(#)gethostname.3	8.1 (Berkeley) 6/4/93
.\"
.TH GETHOSTNAME 3 "25 February 1997" GNO "Library Routines"
.SH NAME
.BR gethostname ,
.BR sethostname
\- get/set name of current host
.SH SYNOPSIS
#include <unistd.h>
.sp 1
int \fBgethostname\fR (char *\fIname\fR, int \fInamelen\fR);
.br
int \fBsethostname\fR (const char *\fIname\fR, int \fInamelen\fR);
.SH DESCRIPTION
.BR Gethostname 
returns the standard host name for the current processor, as
previously set by
.BR sethostname .
The parameter
.I namelen
specifies the size of the 
.I name
array.  The returned name is null-terminated unless insufficient
space is provided.
.LP
.BR Sethostname 
sets the name of the host machine to be
.IR name ,
which has length
.IR 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
.IR errno .
.SH ERRORS
The following errors may be returned by these calls:
.RS
.IP \fBEFAULT\fR
The
.I name
or
.I namelen
parameter gave an
invalid address.
.IP \fBEPERM\fR
The caller tried to set the hostname and was not the super-user.
.RE
.SH SEE ALSO
.BR gethostid (3),
.BR sysctl (3)
.SH BUGS
Host names are limited to
.BR MAXHOSTNAMELEN
(from <sys/param.h)
characters, currently 256.
.SH HISTORY
The
.BR sethostname
function call appeared in 4.2BSD.