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authorStefan Metzmacher <metze@samba.org>2009-04-03 17:17:15 +0200
committerStefan Metzmacher <metze@samba.org>2009-05-01 17:41:56 +0200
commita0830f4cb93997e235acb95e1bdb438626601974 (patch)
tree3fe6c211906956badbc32440281aaeb2edf02283 /lib
parentee6d796c19e15f6a2e3044ce85ea9ff30dfeb5f0 (diff)
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tsocket: add tstream_readv_pdu_send/recv()
metze
Diffstat (limited to 'lib')
-rw-r--r--lib/tsocket/tsocket.h14
-rw-r--r--lib/tsocket/tsocket_helpers.c165
2 files changed, 178 insertions, 1 deletions
diff --git a/lib/tsocket/tsocket.h b/lib/tsocket/tsocket.h
index 6583a5e786..aef73ae8c5 100644
--- a/lib/tsocket/tsocket.h
+++ b/lib/tsocket/tsocket.h
@@ -190,7 +190,7 @@ int _tstream_bsd_existing_socket(TALLOC_CTX *mem_ctx,
__location__)
/*
- * Queue helpers
+ * Queue and PDU helpers
*/
struct tevent_req *tdgram_sendto_queue_send(TALLOC_CTX *mem_ctx,
@@ -202,5 +202,17 @@ struct tevent_req *tdgram_sendto_queue_send(TALLOC_CTX *mem_ctx,
struct tsocket_address *dst);
ssize_t tdgram_sendto_queue_recv(struct tevent_req *req, int *perrno);
+typedef int (*tstream_readv_pdu_next_vector_t)(struct tstream_context *stream,
+ void *private_data,
+ TALLOC_CTX *mem_ctx,
+ struct iovec **vector,
+ size_t *count);
+struct tevent_req *tstream_readv_pdu_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct tstream_context *stream,
+ tstream_readv_pdu_next_vector_t next_vector_fn,
+ void *next_vector_private);
+int tstream_readv_pdu_recv(struct tevent_req *req, int *perrno);
+
#endif /* _TSOCKET_H */
diff --git a/lib/tsocket/tsocket_helpers.c b/lib/tsocket/tsocket_helpers.c
index 1876dc3882..1b9a9bf670 100644
--- a/lib/tsocket/tsocket_helpers.c
+++ b/lib/tsocket/tsocket_helpers.c
@@ -22,6 +22,7 @@
*/
#include "replace.h"
+#include "system/filesys.h"
#include "tsocket.h"
#include "tsocket_internal.h"
@@ -155,3 +156,167 @@ ssize_t tdgram_sendto_queue_recv(struct tevent_req *req, int *perrno)
return ret;
}
+struct tstream_readv_pdu_state {
+ /* this structs are owned by the caller */
+ struct {
+ struct tevent_context *ev;
+ struct tstream_context *stream;
+ tstream_readv_pdu_next_vector_t next_vector_fn;
+ void *next_vector_private;
+ } caller;
+
+ /*
+ * Each call to the callback resets iov and count
+ * the callback allocated the iov as child of our state,
+ * that means we are allowed to modify and free it.
+ *
+ * we should call the callback every time we filled the given
+ * vector and ask for a new vector. We return if the callback
+ * ask for 0 bytes.
+ */
+ struct iovec *vector;
+ size_t count;
+
+ /*
+ * the total number of bytes we read,
+ * the return value of the _recv function
+ */
+ int total_read;
+};
+
+static void tstream_readv_pdu_ask_for_next_vector(struct tevent_req *req);
+static void tstream_readv_pdu_readv_done(struct tevent_req *subreq);
+
+struct tevent_req *tstream_readv_pdu_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct tstream_context *stream,
+ tstream_readv_pdu_next_vector_t next_vector_fn,
+ void *next_vector_private)
+{
+ struct tevent_req *req;
+ struct tstream_readv_pdu_state *state;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct tstream_readv_pdu_state);
+ if (!req) {
+ return NULL;
+ }
+
+ state->caller.ev = ev;
+ state->caller.stream = stream;
+ state->caller.next_vector_fn = next_vector_fn;
+ state->caller.next_vector_private = next_vector_private;
+
+ state->vector = NULL;
+ state->count = 0;
+ state->total_read = 0;
+
+ tstream_readv_pdu_ask_for_next_vector(req);
+ if (!tevent_req_is_in_progress(req)) {
+ goto post;
+ }
+
+ return req;
+
+ post:
+ return tevent_req_post(req, ev);
+}
+
+static void tstream_readv_pdu_ask_for_next_vector(struct tevent_req *req)
+{
+ struct tstream_readv_pdu_state *state = tevent_req_data(req,
+ struct tstream_readv_pdu_state);
+ int ret;
+ size_t to_read = 0;
+ size_t i;
+ struct tevent_req *subreq;
+
+ TALLOC_FREE(state->vector);
+ state->count = 0;
+
+ ret = state->caller.next_vector_fn(state->caller.stream,
+ state->caller.next_vector_private,
+ state, &state->vector, &state->count);
+ if (ret == -1) {
+ tevent_req_error(req, errno);
+ return;
+ }
+
+ if (state->count == 0) {
+ tevent_req_done(req);
+ return;
+ }
+
+ for (i=0; i < state->count; i++) {
+ size_t tmp = to_read;
+ tmp += state->vector[i].iov_len;
+
+ if (tmp < to_read) {
+ tevent_req_error(req, EMSGSIZE);
+ return;
+ }
+
+ to_read = tmp;
+ }
+
+ /*
+ * this is invalid the next vector function should have
+ * reported count == 0.
+ */
+ if (to_read == 0) {
+ tevent_req_error(req, EINVAL);
+ return;
+ }
+
+ if (state->total_read + to_read < state->total_read) {
+ tevent_req_error(req, EMSGSIZE);
+ return;
+ }
+
+ subreq = tstream_readv_send(state,
+ state->caller.ev,
+ state->caller.stream,
+ state->vector,
+ state->count);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, tstream_readv_pdu_readv_done, req);
+}
+
+static void tstream_readv_pdu_readv_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(subreq,
+ struct tevent_req);
+ struct tstream_readv_pdu_state *state = tevent_req_data(req,
+ struct tstream_readv_pdu_state);
+ int ret;
+ int sys_errno;
+
+ ret = tstream_readv_recv(subreq, &sys_errno);
+ if (ret == -1) {
+ tevent_req_error(req, sys_errno);
+ return;
+ }
+
+ state->total_read += ret;
+
+ /* ask the callback for a new vector we should fill */
+ tstream_readv_pdu_ask_for_next_vector(req);
+}
+
+int tstream_readv_pdu_recv(struct tevent_req *req, int *perrno)
+{
+ struct tstream_readv_pdu_state *state = tevent_req_data(req,
+ struct tstream_readv_pdu_state);
+ int ret;
+
+ ret = tsocket_simple_int_recv(req, perrno);
+ if (ret == 0) {
+ ret = state->total_read;
+ }
+
+ tevent_req_received(req);
+ return ret;
+}
+