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lib/tsocket: add tsocket_writev_send/recv()
metze
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parent
a140823cc9
commit
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@ -7,7 +7,8 @@ LIBTSOCKET_OBJ_FILES = $(addprefix ../lib/tsocket/, \
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tsocket_bsd.o \
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tsocket_bsd.o \
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tsocket_recvfrom.o \
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tsocket_recvfrom.o \
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tsocket_sendto.o \
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tsocket_sendto.o \
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tsocket_connect.o)
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tsocket_connect.o \
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tsocket_writev.o)
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PUBLIC_HEADERS += $(addprefix ../lib/tsocket/, \
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PUBLIC_HEADERS += $(addprefix ../lib/tsocket/, \
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tsocket.h\
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tsocket.h\
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@ -192,5 +192,11 @@ struct tevent_req *tsocket_connect_send(struct tsocket_context *sock,
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const struct tsocket_address *dst);
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const struct tsocket_address *dst);
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int tsocket_connect_recv(struct tevent_req *req, int *perrno);
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int tsocket_connect_recv(struct tevent_req *req, int *perrno);
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struct tevent_req *tsocket_writev_send(struct tsocket_context *sock,
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TALLOC_CTX *mem_ctx,
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const struct iovec *vector,
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size_t count);
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int tsocket_writev_recv(struct tevent_req *req, int *perrno);
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#endif /* _TSOCKET_H */
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#endif /* _TSOCKET_H */
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187
lib/tsocket/tsocket_writev.c
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187
lib/tsocket/tsocket_writev.c
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@ -0,0 +1,187 @@
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/*
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Unix SMB/CIFS implementation.
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Copyright (C) Stefan Metzmacher 2009
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** NOTE! The following LGPL license applies to the tevent
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** library. This does NOT imply that all of Samba is released
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** under the LGPL
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/network.h"
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#include "tsocket.h"
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#include "tsocket_internal.h"
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struct tsocket_writev_state {
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/* this structs are owned by the caller */
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struct {
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struct tsocket_context *sock;
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const struct iovec *vector;
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size_t count;
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} caller;
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struct iovec *iov;
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size_t count;
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int total_written;
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};
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static int tsocket_writev_state_destructor(struct tsocket_writev_state *state)
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{
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if (state->caller.sock) {
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tsocket_set_writeable_handler(state->caller.sock, NULL, NULL);
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}
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ZERO_STRUCT(state->caller);
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return 0;
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}
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static void tsocket_writev_handler(struct tsocket_context *sock,
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void *private_data);
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struct tevent_req *tsocket_writev_send(struct tsocket_context *sock,
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TALLOC_CTX *mem_ctx,
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const struct iovec *vector,
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size_t count)
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{
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struct tevent_req *req;
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struct tsocket_writev_state *state;
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int ret;
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int err;
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bool dummy;
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int to_write = 0;
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size_t i;
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req = tevent_req_create(mem_ctx, &state,
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struct tsocket_writev_state);
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if (!req) {
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return NULL;
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}
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state->caller.sock = sock;
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state->caller.vector = vector;
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state->caller.count = count;
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state->iov = NULL;
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state->count = count;
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state->total_written = 0;
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state->iov = talloc_array(state, struct iovec, count);
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if (tevent_req_nomem(state->iov, req)) {
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goto post;
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}
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memcpy(state->iov, vector, sizeof(struct iovec) * count);
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for (i=0; i < count; i++) {
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int tmp = to_write;
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tmp += state->iov[i].iov_len;
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if (tmp < to_write) {
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tevent_req_error(req, EMSGSIZE);
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goto post;
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}
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to_write = tmp;
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}
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if (to_write == 0) {
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tevent_req_done(req);
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goto post;
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}
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talloc_set_destructor(state, tsocket_writev_state_destructor);
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ret = tsocket_set_writeable_handler(sock,
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tsocket_writev_handler,
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req);
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err = tsocket_error_from_errno(ret, errno, &dummy);
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if (tevent_req_error(req, err)) {
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goto post;
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}
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return req;
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post:
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return tevent_req_post(req, sock->event.ctx);
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}
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static void tsocket_writev_handler(struct tsocket_context *sock,
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void *private_data)
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{
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struct tevent_req *req = talloc_get_type(private_data,
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struct tevent_req);
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struct tsocket_writev_state *state = tevent_req_data(req,
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struct tsocket_writev_state);
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int ret;
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int err;
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bool retry;
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ret = tsocket_writev(state->caller.sock,
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state->iov,
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state->count);
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err = tsocket_error_from_errno(ret, errno, &retry);
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if (retry) {
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/* retry later */
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return;
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}
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if (tevent_req_error(req, err)) {
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return;
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}
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state->total_written += ret;
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/*
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* we have not written everything yet, so we need to truncate
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* the already written bytes from our iov copy
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*/
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while (ret > 0) {
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if (ret < state->iov[0].iov_len) {
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uint8_t *base;
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base = (uint8_t *)state->iov[0].iov_base;
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base += ret;
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state->iov[0].iov_base = base;
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state->iov[0].iov_len -= ret;
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break;
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}
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ret -= state->iov[0].iov_len;
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state->iov += 1;
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state->count -= 1;
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}
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if (state->count > 0) {
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/* more to write */
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return;
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}
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tevent_req_done(req);
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}
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int tsocket_writev_recv(struct tevent_req *req, int *perrno)
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{
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struct tsocket_writev_state *state = tevent_req_data(req,
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struct tsocket_writev_state);
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int ret;
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ret = tsocket_simple_int_recv(req, perrno);
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if (ret == 0) {
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ret = state->total_written;
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}
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tevent_req_received(req);
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return ret;
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}
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