adns_if_noenv= 0x0001, /* do not look at environment */
adns_if_noerrprint= 0x0002, /* never print output to stderr */
adns_if_debug= 0x0004, /* print debugging output to stderr */
+ adns_if_noautosys= 0x0008, /* do not do full flow-of-control whenever we can */
} adns_initflags;
typedef enum {
} adns_queryflags;
typedef enum {
- adns__rrttype_mask= 0x0fff,
- adns__qtf_deref= 0x1000, /* dereference domains and produce extra data */
- adns__qtf_mailconv= 0x2000, /* put @ between first and second labels */
- adns_r_none= 0,
- adns_r_a= 1,
- adns_r_ns_raw= 2,
- adns_r_ns= adns_r_ns_raw|adns__qtf_deref,
- adns_r_cname= 5,
- adns_r_soa_raw= 6,
- adns_r_soa= adns_r_soa_raw|adns__qtf_mailconv,
- adns_r_null= 10,
- adns_r_ptr_raw= 12,
- adns_r_ptr= adns_r_ptr_raw|adns__qtf_deref,
- adns_r_hinfo= 13,
- adns_r_mx_raw= 15,
- adns_r_mx= adns_r_mx_raw|adns__qtf_deref,
- adns_r_txt= 16,
- adns_r_rp_raw= 17,
- adns_r_rp= adns_r_rp_raw|adns__qtf_mailconv
+ adns__rrt_typemask= 0x0ffff,
+ adns__qtf_deref= 0x10000, /* dereference domains and produce extra data */
+ adns__qtf_mailconv= 0x20000, /* put @ between first and second labels */
+ adns_r_none= 0,
+ adns_r_a= 1,
+ adns_r_ns_raw= 2,
+ adns_r_ns= adns_r_ns_raw|adns__qtf_deref,
+ adns_r_cname= 5,
+ adns_r_soa_raw= 6,
+ adns_r_soa= adns_r_soa_raw|adns__qtf_mailconv,
+ adns_r_null= 10,
+ adns_r_ptr_raw= 12,
+ adns_r_ptr= adns_r_ptr_raw|adns__qtf_deref,
+ adns_r_hinfo= 13,
+ adns_r_mx_raw= 15,
+ adns_r_mx= adns_r_mx_raw|adns__qtf_deref,
+ adns_r_txt= 16,
+ adns_r_rp_raw= 17,
+ adns_r_rp= adns_r_rp_raw|adns__qtf_mailconv
} adns_rrtype;
/* In queries without qtf_anyquote, all domains must have standard
adns_s_serverfailure,
adns_s_unknownqtype,
adns_s_remoteerror,
+ adns_s_nolocalmem,
adns_s_max_tempfail= 99,
adns_s_nxdomain,
adns_s_norecord,
* used.
*/
-struct adns_answer {
+typedef struct {
adns_status status;
char *cname; /* always NULL if query was for CNAME records */
adns_rrtype type;
} soa[1]; /* soa, soa_raw */
/* NULL is empty */
} rrs;
-};
+} adns_answer;
/* Memory management:
* adns_state and adns_query are actually pointers to malloc'd state;
* are returned in the status field of the answer. If status is
* nonzero then nrrs will be 0, otherwise it will be >0.
* type will always be the type requested;
- * If no (appropriate) requests are done adns_query returns EWOULDBLOCK;
- * If no requests are outstanding adns_query and adns_wait return ESRCH;
+ * If no (appropriate) requests are done adns_check returns EWOULDBLOCK;
+ * If no (appropriate) requests are outstanding adns_query and adns_wait return ESRCH;
* If malloc failure occurs during internal allocation or processing
- * ands_query, _wait and _answer set *answer to 0.
+ * ands_check and _wait set *answer to 0.
*/
int adns_init(adns_state *newstate_r, adns_initflags flags);
int adns_synchronous(adns_state ads,
const char *owner,
adns_rrtype type,
- int flags,
- struct adns_answer *answer);
+ adns_queryflags flags,
+ adns_answer *answer);
+/* Will not return EINTR. */
+
+/* NB: if you set adns_if_noautosys then _submit and _check do not
+ * make any system calls; you must use adns_callback (possibly after
+ * adns_interest) to actually get things to happen.
+ */
int adns_submit(adns_state ads,
const char *owner,
adns_rrtype type,
- int flags,
+ adns_queryflags flags,
void *context,
adns_query *query_r);
int adns_check(adns_state ads,
adns_query *query_io,
- struct adns_answer *answer,
+ adns_answer *answer,
void *context_r);
int adns_wait(adns_state ads,
adns_query *query_io,
- struct adns_answer *answer,
+ adns_answer *answer,
void *context_r);
+/* Might return EINTR - if so, try again */
-int adns_cancel(adns_state ads, adns_query query);
+void adns_cancel(adns_state ads, adns_query query);
int adns_finish(adns_state);
-void adns_interest(adns_state, fd_set *readfds_mod,
- fd_set *writefds_mod, fd_set *exceptfds_mod,
- int *maxfd_mod, struct timeval **tv_mod, struct timeval *tv_buf);
-/* You may call this with *_mod=0 to allow adns to have flow-of-control
- * briefly, or with *fds_mod=*maxfd_mod=0 but tv_mod!=0 if you are
- * not going to sleep, or with all !=0 if you are going to sleep.
- * If tv_mod!=0 and *tv_mod=0 then tv_buf must be !0 and *tv_buf is irrelevant
- * and may be overwritten (and *tv_mod set to tv_buf); otherwise tv_buf is ignored.
+int adns_callback(adns_state, int maxfd, const fd_set *readfds, const fd_set *writefds,
+ const fd_set *exceptfds);
+/* Gives adns flow-of-control for a bit. This will never block.
+ * If maxfd == -1 then adns will check (make nonblocking system calls on)
+ * all of its own filedescriptors; otherwise it will only use those
+ * < maxfd and specified in the fd_set's, as if select had returned them.
+ * Other fd's may be in the fd_sets, and will be ignored.
+ * _callback returns how many adns fd's were in the various sets, so
+ * you can tell if your select handling code has missed something and is going awol.
*/
-int adns_callback(adns_state, fd_set readfds, fd_set writefds,
- fd_set exceptfds, int maxfd);
-/* For select-driven programs, this allows adns to know which fd's are relevant,
- * so that it doesn't need to make syscalls on others of its fd's. It's a kind
- * of limited flow-of-control allowance. It will return how many adns fd's were
- * in the set, so you can tell if your select handling code is missing things.
+void adns_interest(adns_state, int *maxfd_io, fd_set *readfds_io,
+ fd_set *writefds_io, fd_set *exceptfds_io,
+ struct timeval **tv_mod, struct timeval *tv_buf);
+/* Find out file descriptors adns is interested in, and when it
+ * would like the opportunity to time something out. If you do not plan to
+ * block then tv_mod may be 0. Otherwise, tv_mod may point to 0 meaning
+ * you have no timeout of your own, in which case tv_buf must be non-null and
+ * _interest may fill it in and set *tv_mod=tv_buf.
+ * readfds, writefds, exceptfds and maxfd may not be 0.
*/
/* Example expected/legal calling sequences:
* ....
* adns_finish
*
- * adns_init
- * adns_submit ...
+ * adns_init _noautosys
* loop {
- * adns_check
* adns_interest
* select
* adns_callback
- * other things
+ * ...
+ * adns_submit / adns_check
+ * ...
* }
*/
~ianmdlvl / adns.git / blobdiff