RES_SEND_SETQHOOK(3C)					 RES_SEND_SETQHOOK(3C)

NAME    [Toc]    [Back]

     res_send_setqhook,	res_send_setrhook - interface to resolver hooks

SYNOPSIS    [Toc]    [Back]

     int res_send_setqhook(char	*proc);

     int res_send_setrhook(char	*proc);

DESCRIPTION    [Toc]    [Back]

     res_send_setqhook , ( res_send_setrhook ) allow for a function hook to be
     implemented at the	beginning (end)	of the resolution query	process,
     res_send(3).  The hook function takes the form:

     res_sendhookact proc(struct sockaddr_in **nsap, char **buf, int *buflen,
     char *ans,	int anssiz, int	*resplen)

     where res_sendhookact is a	typedef: (see /usr/include/resolv.h)

     typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error
     } res_sendhookact;

     The resolver library will walk through the	current	list of	name servers,
     as	argument nsap.	buf, buflen, ans and anssiz are	the four arguments
     found in res_send(3) , and	resplen	is the length of the reply message
     (returned by res_send.)

FILES    [Toc]    [Back]

     /usr/include/resolv.h

SEE ALSO    [Toc]    [Back]

     res_send(3), resolver(4).


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