GETHOSTNAME(3) BSD Library Functions Manual GETHOSTNAME(3)

NAME
     ggeetthhoossttnnaammee, sseetthhoossttnnaammee - get/set name of current host

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     int
     ggeetthhoossttnnaammee(char *name, sizet namelen);

     int
     sseetthhoossttnnaammee(const char *name, int namelen);

DESCRIPTION
     The ggeetthhoossttnnaammee() function returns the standard host name for the current
     processor, as previously set by sseetthhoossttnnaammee().  The namelen argument
     specifies the size of the name array.  The returned name is null-termi-
     nated unless insufficient space is provided.

     The sseetthhoossttnnaammee() function sets the name of the host machine to be name,
     which has length namelen.  This call is restricted to the super-user and
     is normally used only when the system is bootstrapped.

     Host names are limited to {HOSTNAMEMAX} characters, not including the
     trailing null, currently 255.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

EERRRROORRSS
     The following errors may be returned by these calls:

     [EFAULT]           The name or namelen argument gave an invalid address.

     [ENAMETOOLONG]     The current host name is longer than namelen.  (For
                        ggeetthhoossttnnaammee() only.)

     [EPERM]            The caller tried to set the host name and was not the
                        super-user.

SEE ALSO
     sysconf(3), sysctl(3)

STANDARDS
     The ggeetthhoossttnnaammee() function conforms to IEEE Std 1003.1-2001
     (``POSIX.1'').  Callers should be aware that {HOSTNAMEMAX} may be vari-
     able or infinite, but is guaranteed to be no less than
     {POSIXHOSTNAMEMAX}.  On older systems, this limit was defined in the
     non-standard header  as MAXHOSTNAMELEN, and counted the ter-
     minating null.  The sseetthhoossttnnaammee() function and the error returns for
     ggeetthhoossttnnaammee() are not standardized.

HISTORY     The ggeetthhoossttnnaammee() function appeared in 4.2BSD.  The namelen argument to
     ggeetthhoossttnnaammee() was changed to sizet in FreeBSD 5.2 for alignment with
     IEEE Std 1003.1-2001 (``POSIX.1'').

BSD                             August 18, 2003                            BSD