lib/tsocket: add tsocket_writev_send/recv()
authorStefan Metzmacher <metze@samba.org>
Wed, 11 Mar 2009 13:10:47 +0000 (14:10 +0100)
committerStefan Metzmacher <metze@samba.org>
Thu, 19 Mar 2009 15:25:55 +0000 (16:25 +0100)
metze

lib/tsocket/config.mk
lib/tsocket/tsocket.h
lib/tsocket/tsocket_writev.c [new file with mode: 0644]

index b3890408f96343096ad1e837eca2b7c9eb10b952..72614a3f82468c23b454dbd8fbbebeddba9da31d 100644 (file)
@@ -7,7 +7,8 @@ LIBTSOCKET_OBJ_FILES = $(addprefix ../lib/tsocket/, \
                                        tsocket_bsd.o \
                                        tsocket_recvfrom.o \
                                        tsocket_sendto.o \
                                        tsocket_bsd.o \
                                        tsocket_recvfrom.o \
                                        tsocket_sendto.o \
-                                       tsocket_connect.o)
+                                       tsocket_connect.o \
+                                       tsocket_writev.o)
 
 PUBLIC_HEADERS += $(addprefix ../lib/tsocket/, \
                                 tsocket.h\
 
 PUBLIC_HEADERS += $(addprefix ../lib/tsocket/, \
                                 tsocket.h\
index f7a7d6b61486230388ff36f17a8f1a99f5764130..2456062b47ef24968929100ec8099ed3d492569e 100644 (file)
@@ -192,5 +192,11 @@ struct tevent_req *tsocket_connect_send(struct tsocket_context *sock,
                                        const struct tsocket_address *dst);
 int tsocket_connect_recv(struct tevent_req *req, int *perrno);
 
                                        const struct tsocket_address *dst);
 int tsocket_connect_recv(struct tevent_req *req, int *perrno);
 
+struct tevent_req *tsocket_writev_send(struct tsocket_context *sock,
+                                      TALLOC_CTX *mem_ctx,
+                                      const struct iovec *vector,
+                                      size_t count);
+int tsocket_writev_recv(struct tevent_req *req, int *perrno);
+
 #endif /* _TSOCKET_H */
 
 #endif /* _TSOCKET_H */
 
diff --git a/lib/tsocket/tsocket_writev.c b/lib/tsocket/tsocket_writev.c
new file mode 100644 (file)
index 0000000..40b24b1
--- /dev/null
@@ -0,0 +1,187 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Stefan Metzmacher 2009
+
+     ** NOTE! The following LGPL license applies to the tevent
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/network.h"
+#include "tsocket.h"
+#include "tsocket_internal.h"
+
+struct tsocket_writev_state {
+       /* this structs are owned by the caller */
+       struct {
+               struct tsocket_context *sock;
+               const struct iovec *vector;
+               size_t count;
+       } caller;
+
+       struct iovec *iov;
+       size_t count;
+       int total_written;
+};
+
+static int tsocket_writev_state_destructor(struct tsocket_writev_state *state)
+{
+       if (state->caller.sock) {
+               tsocket_set_writeable_handler(state->caller.sock, NULL, NULL);
+       }
+       ZERO_STRUCT(state->caller);
+
+       return 0;
+}
+
+static void tsocket_writev_handler(struct tsocket_context *sock,
+                                  void *private_data);
+
+struct tevent_req *tsocket_writev_send(struct tsocket_context *sock,
+                                      TALLOC_CTX *mem_ctx,
+                                      const struct iovec *vector,
+                                      size_t count)
+{
+       struct tevent_req *req;
+       struct tsocket_writev_state *state;
+       int ret;
+       int err;
+       bool dummy;
+       int to_write = 0;
+       size_t i;
+
+       req = tevent_req_create(mem_ctx, &state,
+                               struct tsocket_writev_state);
+       if (!req) {
+               return NULL;
+       }
+
+       state->caller.sock      = sock;
+       state->caller.vector    = vector;
+       state->caller.count     = count;
+
+       state->iov              = NULL;
+       state->count            = count;
+       state->total_written    = 0;
+
+       state->iov = talloc_array(state, struct iovec, count);
+       if (tevent_req_nomem(state->iov, req)) {
+               goto post;
+       }
+       memcpy(state->iov, vector, sizeof(struct iovec) * count);
+
+       for (i=0; i < count; i++) {
+               int tmp = to_write;
+
+               tmp += state->iov[i].iov_len;
+
+               if (tmp < to_write) {
+                       tevent_req_error(req, EMSGSIZE);
+                       goto post;
+               }
+
+               to_write = tmp;
+       }
+
+       if (to_write == 0) {
+               tevent_req_done(req);
+               goto post;
+       }
+
+       talloc_set_destructor(state, tsocket_writev_state_destructor);
+
+       ret = tsocket_set_writeable_handler(sock,
+                                           tsocket_writev_handler,
+                                           req);
+       err = tsocket_error_from_errno(ret, errno, &dummy);
+       if (tevent_req_error(req, err)) {
+               goto post;
+       }
+
+       return req;
+
+ post:
+       return tevent_req_post(req, sock->event.ctx);
+}
+
+static void tsocket_writev_handler(struct tsocket_context *sock,
+                                  void *private_data)
+{
+       struct tevent_req *req = talloc_get_type(private_data,
+                                struct tevent_req);
+       struct tsocket_writev_state *state = tevent_req_data(req,
+                                            struct tsocket_writev_state);
+       int ret;
+       int err;
+       bool retry;
+
+       ret = tsocket_writev(state->caller.sock,
+                            state->iov,
+                            state->count);
+       err = tsocket_error_from_errno(ret, errno, &retry);
+       if (retry) {
+               /* retry later */
+               return;
+       }
+       if (tevent_req_error(req, err)) {
+               return;
+       }
+
+       state->total_written += ret;
+
+       /*
+        * we have not written everything yet, so we need to truncate
+        * the already written bytes from our iov copy
+        */
+       while (ret > 0) {
+               if (ret < state->iov[0].iov_len) {
+                       uint8_t *base;
+                       base = (uint8_t *)state->iov[0].iov_base;
+                       base += ret;
+                       state->iov[0].iov_base = base;
+                       state->iov[0].iov_len -= ret;
+                       break;
+               }
+               ret -= state->iov[0].iov_len;
+               state->iov += 1;
+               state->count -= 1;
+       }
+
+       if (state->count > 0) {
+               /* more to write */
+               return;
+       }
+
+       tevent_req_done(req);
+}
+
+int tsocket_writev_recv(struct tevent_req *req, int *perrno)
+{
+       struct tsocket_writev_state *state = tevent_req_data(req,
+                                            struct tsocket_writev_state);
+       int ret;
+
+       ret = tsocket_simple_int_recv(req, perrno);
+       if (ret == 0) {
+               ret = state->total_written;
+       }
+
+       tevent_req_received(req);
+       return ret;
+}
+