1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
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;
}
|
