GETHOSTNAME(3)            OpenBSD Programmer's Manual           GETHOSTNAME(3)

NAME
     gethostname, sethostname - get/set name of current host



SYNOPSIS
     #include <unistd.h>

     int
     gethostname(char *name, size_t namelen);

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

DESCRIPTION
     The gethostname() function returns the standard host name for the current
     processor, as previously set by sethostname().  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.

     sethostname() 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.

RETURN VALUES
     If the call succeeds a value of 0 is returned.  If the call fails, a val-
     ue of -1 is returned and an error code is placed in the global variable
     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 hostname and was not the super-
                   user.

SEE ALSO
     hostname(1),  getdomainname(3),  gethostid(3),  sysctl(3),  sysctl(8),
     yp(8)

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

     If the buffer passed to gethostname() is smaller than MAXHOSTNAMELEN,
     other operating systems may not guarantee termination with NUL.

HISTORY
     The gethostname() function call appeared in 4.2BSD.

STANDARDS
     The gethostname() function call conforms to X/Open Portability Guide
     Issue 4.2 (``XPG4.2'').

OpenBSD 2.6                      June 4, 1993                                1