diff options
Diffstat (limited to 'lib/tsocket/tsocket_sendto.c')
| -rw-r--r-- | lib/tsocket/tsocket_sendto.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/lib/tsocket/tsocket_sendto.c b/lib/tsocket/tsocket_sendto.c new file mode 100644 index 0000000000..9c0a76bf16 --- /dev/null +++ b/lib/tsocket/tsocket_sendto.c @@ -0,0 +1,271 @@ +/* + 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_sendto_state { + /* this structs are owned by the caller */ + struct { + struct tsocket_context *sock; + const uint8_t *buf; + size_t len; + const struct tsocket_address *dst; + } caller; + + ssize_t ret; +}; + +static int tsocket_sendto_state_destructor(struct tsocket_sendto_state *state) +{ + if (state->caller.sock) { + tsocket_set_writeable_handler(state->caller.sock, NULL, NULL); + } + ZERO_STRUCT(state->caller); + + return 0; +} + +static void tsocket_sendto_handler(struct tsocket_context *sock, + void *private_data); + +struct tevent_req *tsocket_sendto_send(struct tsocket_context *sock, + TALLOC_CTX *mem_ctx, + const uint8_t *buf, + size_t len, + const struct tsocket_address *dst) +{ + struct tevent_req *req; + struct tsocket_sendto_state *state; + int ret; + int err; + bool dummy; + + req = tevent_req_create(mem_ctx, &state, + struct tsocket_sendto_state); + if (!req) { + return NULL; + } + + state->caller.sock = sock; + state->caller.buf = buf; + state->caller.len = len; + state->caller.dst = dst; + state->ret = -1; + + /* + * this is a fast path, not waiting for the + * socket to become explicit writeable gains + * about 10%-20% performance in benchmark tests. + */ + tsocket_sendto_handler(sock, req); + if (!tevent_req_is_in_progress(req)) { + goto post; + } + + talloc_set_destructor(state, tsocket_sendto_state_destructor); + + ret = tsocket_set_writeable_handler(sock, + tsocket_sendto_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_sendto_handler(struct tsocket_context *sock, + void *private_data) +{ + struct tevent_req *req = talloc_get_type(private_data, + struct tevent_req); + struct tsocket_sendto_state *state = tevent_req_data(req, + struct tsocket_sendto_state); + ssize_t ret; + int err; + bool retry; + + ret = tsocket_sendto(state->caller.sock, + state->caller.buf, + state->caller.len, + state->caller.dst); + err = tsocket_error_from_errno(ret, errno, &retry); + if (retry) { + /* retry later */ + return; + } + if (tevent_req_error(req, err)) { + return; + } + + state->ret = ret; + + tevent_req_done(req); +} + +ssize_t tsocket_sendto_recv(struct tevent_req *req, int *perrno) +{ + struct tsocket_sendto_state *state = tevent_req_data(req, + struct tsocket_sendto_state); + ssize_t ret; + + ret = tsocket_simple_int_recv(req, perrno); + if (ret == 0) { + ret = state->ret; + } + + tevent_req_received(req); + return ret; +} + +struct tsocket_sendto_queue_state { + /* this structs are owned by the caller */ + struct { + struct tsocket_context *sock; + const uint8_t *buf; + size_t len; + const struct tsocket_address *dst; + } caller; + ssize_t ret; +}; + +static void tsocket_sendto_queue_trigger(struct tevent_req *req, + void *private_data); +static void tsocket_sendto_queue_done(struct tevent_req *subreq); + +/** + * @brief Queue a dgram blob for sending through the socket + * @param[in] mem_ctx The memory context for the result + * @param[in] sock The socket to send the message buffer + * @param[in] queue The existing dgram queue + * @param[in] buf The message buffer + * @param[in] len The message length + * @param[in] dst The destination socket address + * @retval The async request handle + * + * This function queues a blob for sending to destination through an existing + * dgram socket. The async callback is triggered when the whole blob is + * delivered to the underlying system socket. + * + * The caller needs to make sure that all non-scalar input parameters hang + * arround for the whole lifetime of the request. + */ +struct tevent_req *tsocket_sendto_queue_send(TALLOC_CTX *mem_ctx, + struct tsocket_context *sock, + struct tevent_queue *queue, + const uint8_t *buf, + size_t len, + struct tsocket_address *dst) +{ + struct tevent_req *req; + struct tsocket_sendto_queue_state *state; + bool ok; + + req = tevent_req_create(mem_ctx, &state, + struct tsocket_sendto_queue_state); + if (!req) { + return NULL; + } + + state->caller.sock = sock; + state->caller.buf = buf; + state->caller.len = len; + state->caller.dst = dst; + state->ret = -1; + + ok = tevent_queue_add(queue, + sock->event.ctx, + req, + tsocket_sendto_queue_trigger, + NULL); + if (!ok) { + tevent_req_nomem(NULL, req); + goto post; + } + + return req; + + post: + return tevent_req_post(req, sock->event.ctx); +} + +static void tsocket_sendto_queue_trigger(struct tevent_req *req, + void *private_data) +{ + struct tsocket_sendto_queue_state *state = tevent_req_data(req, + struct tsocket_sendto_queue_state); + struct tevent_req *subreq; + + subreq = tsocket_sendto_send(state->caller.sock, + state, + state->caller.buf, + state->caller.len, + state->caller.dst); + if (tevent_req_nomem(subreq, req)) { + return; + } + tevent_req_set_callback(subreq, tsocket_sendto_queue_done ,req); +} + +static void tsocket_sendto_queue_done(struct tevent_req *subreq) +{ + struct tevent_req *req = tevent_req_callback_data(subreq, + struct tevent_req); + struct tsocket_sendto_queue_state *state = tevent_req_data(req, + struct tsocket_sendto_queue_state); + ssize_t ret; + int sys_errno; + + ret = tsocket_sendto_recv(subreq, &sys_errno); + talloc_free(subreq); + if (ret == -1) { + tevent_req_error(req, sys_errno); + return; + } + state->ret = ret; + + tevent_req_done(req); +} + +ssize_t tsocket_sendto_queue_recv(struct tevent_req *req, int *perrno) +{ + struct tsocket_sendto_queue_state *state = tevent_req_data(req, + struct tsocket_sendto_queue_state); + ssize_t ret; + + ret = tsocket_simple_int_recv(req, perrno); + if (ret == 0) { + ret = state->ret; + } + + tevent_req_received(req); + return ret; +} + |