Checking for unix hosts that do not have reverse lookup

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ares_gethostbyname_file

ARES_GETHOSTBYNAME(3)					     Library Functions Manual					     ARES_GETHOSTBYNAME(3)

NAME

       ares_gethostbyname_file - Lookup a name in the system's hosts file

SYNOPSIS

       #include <ares.h>

       int ares_gethostbyname_file(ares_channel channel, const char *name,
	    int family, struct hostent **host)

DESCRIPTION

       The  ares_gethostbyname_file  function  performs  a host lookup by name against the system's hosts file (or equivalent local hostname data-
       base).  The channel parameter is required, but no asynchronous queries are performed.  Instead, the lookup is done via the  same  mechanism
       used to perform 'f' lookups (see the lookups options field in ares_init_options(3)).  The parameter name gives the hostname as a NUL-termi-
       nated C string, and family gives the desired type of address for the resulting host entry.

       The return value indicates whether the query succeeded and, if not, how it failed.  It may have any of the following values:

       ARES_SUCCESS	  The host lookup completed successfully and host now points to the result (and must be freed with ares_free_hostent(3)).

       ARES_ENOTFOUND	  The hostname name was not found.

       ARES_EFILE	  There was a file I/O error while performing the lookup.

       ARES_ENOMEM	  Memory was exhausted.

       On successful completion of the query, the pointer pointed to by host points to a  struct  hostent  containing  the  address  of  the  host
       returned  by  the  lookup.  The user must free the memory pointed to by host when finished with it by calling ares_free_hostent(3).  If the
       lookup did not complete successfully, host will be NULL.

AVAILABILITY

       Added in c-ares 1.5.4

SEE ALSO

       ares_gethostbyname(3), ares_free_hostent(3), ares_init_options(3)

AUTHOR

       Brad Spencer
       Copyright 1998 by the Massachusetts Institute of Technology.

								   25 July 1998 					     ARES_GETHOSTBYNAME(3)

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