gethostent man page on HP-UX

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gethostent(3N)							gethostent(3N)

       gethostent(),  gethostbyaddr(),	gethostbyname(), sethostent(), endhos‐
       tent() - get, set, or end network host entry

       The and functions each return a pointer to a structure of type  defined
       as follows in

       The members of this structure are:

	      The official name of the host.

	      A null-terminated array of alternate names for the host.

	      The type of address being returned; always

	      The length, in bytes, of the address.

	      A null-terminated array of network addresses for the host.

	      The first address in
				  this	is for compatibility with previous HP-
				  UX implementations where a contains only one
				  network address per host.

   Name Service Switch-Based Operation
       These  host  entry  library  routines  internally call the name service
       switch to access the "hosts" database lookup policy configured  in  the
       file  (see  nsswitch.conf(4)).  The lookup policy defines the order and
       the criteria of the supported name services used to resolve host	 names
       and  Internet addresses.	 The operations of these name services: Domain
       Name Server, NIS, and nonserver mode (e.g., files) are listed below.

   Domain Name Server Operation
       If the local system is configured to use the name server (see named(1M)
       and resolver(4)) for name or address resolution, then the function:

	      Always returns a NULL pointer.

	      Requests the use of a connected stream socket
				     for  queries  to  the  name server if the
				     stayopen flag is non-zero.	  The  connec‐
				     tion is retained after each call to or

	      Closes the stream socket connection.

	      Each  retrieves  host  information  from	the name
				     Names are	matched	 without
				     respect   to  uppercase  or
				     lowercase.	  For	example,
				     and all match the entry for

   NIS Server Operation
       If  the	server	for the Network Information Service (see
       ypserv(1M)), is used for name or address resolution, then
       the function:

	      Returns the next entry in the NIS database.

	      Initializes an internal key for the NIS database.
				     If	 the  stayopen	flag  is
				     non-zero, the internal  key
				     is	 not cleared after calls

	      Clears the internal NIS database key.

	      Each retrieves host information from
	      the NIS database.
				     Names     are
				     matched with‐
				     out   respect
				     to	 uppercase
				     or lowercase.
				     For  example,
				     and all match
				     the entry for

   Nonserver Operation
       If the file is used  for	 name  or  address
       resolution, then the function:

	      Reads the next line of opening   the
				     file if  nec‐

	      Opens and rewinds the file.
				     If	 the stay‐
				     open flag	is
				     non-zero, the
				     host     data
				     base  is  not
				     closed  after
				     each  call to
				     directly	or
				     through   one
				     of the  other

	      Closes the file.

	      Sequentially   searches  host  names
	      (among either the official names	or
	      the aliases)
				     matching  its
				     name  parame‐
				     ter  from the
				     beginning	of
				     the      file
				     until EOF	is
				     Names     are
				     matched with‐
				     out   respect
				     to	 uppercase
				     or lowercase,
				     as	 described
				     above in  the
				     name   server

	      Sequentially   searches	from   the
	      beginning of the file
				     until	an
				     matching  its
				     addr  parame‐
				     ter is found,
				     or	 until EOF
				     is	   encoun‐

       The  return  value,  must be saved before a
       subsequent call to the functions and

       In a  multithreaded  application,  and  use
       thread-specific	storage that is re-used in
       each call.  The	return	value,	should	be
       unique for each thread and should be saved,
       if desired, before  the	thread	makes  the
       next  call.  The return value must be saved
       before a subsequent call to the function or
       because these functions may internally call
       the  function  which  may  overwrite  their
       return value.

       For  enumeration	 in multithreaded applica‐
       tions, the position within the  enumeration
       is  a  process-wide  property shared by all
       threads.	 may be used  in  a  multithreaded
       application,  but  resets  the  enumeration
       position	 for  all  threads.  If	  multiple
       threads	interleave  calls  to  the threads
       will enumerate disjoint subsets of the host

       Currently, only the Internet address format
       is understood.  In calls to  the	 parameter
       addr must be a pointer to an in_addr struc‐
       ture, an Internet address in network  order
       (see byteorder(3N)) and the header file The
       parameter len must be the number	 of  bytes
       in an Internet address; that is, The param‐
       eter type must be the constant

       If successful, and return a pointer to  the
       requested structure.

       and  return  NULL  if  their  host  or addr
       parameters, respectively, cannot	 be  found
       in  the	database.   If is being used, they
       also return NULL if they are unable to open

       also returns NULL if either its addr or len
       parameter is invalid.

       always  returns	NULL if the name server is
       being used.

       If the name server is  being  used  and	or
       returns	a NULL pointer, the external inte‐
       ger contains one of the following values:

	      No such host is known.

	      This is usually a temporary error.
				     The     local
				     server    did
				     not receive a
				     response from
				     an authorita‐
				     tive  server.
				     A	retry	at
				     some    later
				     time may suc‐

	      This is a non-recoverable error.

	      The requested name is valid but does
	      not have an IP address;
				     this is not a
				     error.   This
				     means another
				     type	of
				     request	to
				     the      name
				     server   will
				     result in	an

       If  the	name server is not being used, the
       value of may not be meaningful.

       The following code excerpt counts the  num‐
       ber of host entries:

       The  following  sample  program	prints the
       canonical name, aliases, and "."	 separated
       Internet IP addresses for a given "." sepa‐
       rated IP address.

       Programs that use the interfaces	 described
       in this manpage cannot be linked statically
       because the implementations of these  func‐
       tions employ dynamic loading and linking of
       shared objects at run time.

       is  referenced  as  an  for  single  thread
       applications  and  is  defined  as function
       call macro for  multithreaded  applications
       in file Applications that reference need to

       The above reentrant  interfaces	have  been
       moved  from to They are included to support
       existing applications and may be removed in
       the   future  release.	New  multithreaded
       applications should use	the  regular  APIs
       (those without the suffix).

       The  reentrant interfaces function the same
       as the regular interfaces without the  suf‐
       fix.  However,  and expect to be passed the
       address of a and will store the address	of
       the  result at the supplied parameter.  The
       passed  in  address  of	in  the	 reentrant
       interfaces cannot be a NULL pointer.

       The reentrant routines return if the opera‐
       tion is unsuccessful, or, in the case of if
       the end of the hosts list has been reached.
       is returned otherwise.

       was developed by Sun Microsystems Inc.

       named(1M),    ypserv(1M),     resolver(3N),
       ypclnt(3C),   hosts(4),	 nsswitch.conf(4),
       ypfiles(4), thread_safety(5).


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