ares_dup(3) [centos man page]

ARES_DUP(3)						     Library Functions Manual						       ARES_DUP(3)

NAME

       ares_dup - Duplicate a resolver channel

SYNOPSIS

       #include <ares.h>

       int ares_dup(ares_channel *dest, ares_channel source)

DESCRIPTION

       The  ares_dup(3)  function duplicates an existing communications channel for name service lookups.  If it returns successfully, ares_dup(3)
       will set the variable pointed to by dest to a handle used to identify the name service channel.	The caller should  invoke  ares_destroy(3)
       on the handle when the channel is no longer needed.

       The  ares_dup_options  function also initializes a name service channel, with additional options set exactly as the source channel has them
       configured.

SEE ALSO

       ares_destroy(3), ares_init(3), ares_library_init(3)

AVAILABILITY

       ares_dup(3) was added in c-ares 1.6.0

AUTHOR

       Daniel Stenberg

								    26 May 2009 						       ARES_DUP(3)

ARES_SAVE_OPTIONS(3)					     Library Functions Manual					      ARES_SAVE_OPTIONS(3)

NAME

       ares_save_options - Save configuration values obtained from initialized ares_channel

SYNOPSIS

       #include <ares.h>

       int ares_save_options(ares_channel channel, struct ares_options *options, int *optmask)

DESCRIPTION

       The  ares_save_options(3)  function  saves the channel data identified by channel, into the options struct identified by options, and saves
       the mask of options which are set to the integer pointer (passed by reference) identified by optmask.

       The resultant options and optmask are then able to be passed directly to  ares_init_options.   When  the  options  are  no  longer  needed,
       ares_destroy_options should be called to free any associated memory.

RETURN VALUES

       ares_save_options(3) can return any of the following values:

       ARES_SUCCESS   The channel data was successfuly stored

       ARES_ENOMEM    The memory was exhausted

       ARES_ENODATA   The channel data identified by channel were invalid.

NOTE

       Since  c-ares  1.6.0 the ares_options struct has been "locked" meaning that it won't be extended to cover new functions. This function will
       remain functioning, but it can only return config data that can be represented in this config struct, which may no longer be  the  complete
       set of config options. ares_dup(3) will not have that restriction.

       The  ares_options  struct  can not handle potential IPv6 name servers the ares_channel might be configured to use. The ares_save_options(3)
       function will only  return  IPv4  servers,  if  any.  In  order	to  retrieve  all  name  servers  an  ares_channel  might  be  using,  the
       ares_get_servers(3) function must be used instead.

SEE ALSO

       ares_destroy_options(3), ares_init_options(3), ares_get_servers(3), ares_dup(3)

AVAILABILITY

       ares_save_options(3) was added in c-ares 1.4.0

AUTHOR

       Brad House
       Copyright 1998 by the Massachusetts Institute of Technology.

								   5 March 2010 					      ARES_SAVE_OPTIONS(3)