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# Chapter 38. TCP/IP Library Reference

# getdomainname

    GETDOMAINNAME(3)        System Library Functions Manual       GETDOMAINNAME(3)

    NAME
         getdomainname, setdomainname - get/set YP domain name of current host

    SYNOPSIS
         #include <unistd.h>

         int
         getdomainname(char *name, size_t namelen);

         int
         setdomainname(const char *name, size_t namelen);

    DESCRIPTION
         The getdomainname() function returns the YP domain name for the current
         processor, as previously set by setdomainname().  The parameter namelen
         specifies the size of the name array.  If insufficient space is provided,
         the returned name is truncated.  The returned name is always null termi-
         nated.

         setdomainname() sets the domain name of the host machine to be name,
         which has length namelen.  This call is restricted to the superuser and
         is normally used only when the system is bootstrapped.

    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 vari-
         able errno.

    ERRORS
         The following errors may be returned by these calls:

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

         [EPERM]            The caller tried to set the domain name and was not
                            the superuser.

    SEE ALSO
         domainname(1), gethostid(3), gethostname(3), sysctl(3), sysctl(8), yp(8)

    BUGS
         Domain names are limited to MAXHOSTNAMELEN (from <sys/param.h>) charac-
         ters, currently 256.  This includes the terminating NUL character.

         If the buffer passed to getdomainname() is too small, other operating
         systems may not guarantee termination with NUL.

    HISTORY
         The getdomainname function call appeared in SunOS 3.x.

    BSD                               May 6, 1994                              BSD

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