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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*! \file osmo_io_poll.c
* New osmocom async I/O API.
*
* (C) 2022 by Harald Welte <laforge@osmocom.org>
* (C) 2022-2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Daniel Willmann <dwillmann@sysmocom.de>
*
* All Rights Reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*/
#include "../config.h"
#ifndef EMBEDDED
#include <errno.h>
#include <stdio.h>
#include <talloc.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <osmocom/core/osmo_io.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include "osmo_io_internal.h"
static void iofd_poll_ofd_cb_recvmsg_sendmsg(struct osmo_fd *ofd, unsigned int what)
{
struct osmo_io_fd *iofd = ofd->data;
struct msgb *msg;
int rc, flags = 0;
if (what & OSMO_FD_READ) {
struct iofd_msghdr hdr;
msg = iofd_msgb_pending_or_alloc(iofd);
if (!msg) {
LOGPIO(iofd, LOGL_ERROR, "Could not allocate msgb for reading\n");
OSMO_ASSERT(0);
}
hdr.msg = msg;
hdr.iov[0].iov_base = msg->tail;
hdr.iov[0].iov_len = msgb_tailroom(msg);
hdr.hdr = (struct msghdr) {
.msg_iov = &hdr.iov[0],
.msg_iovlen = 1,
.msg_name = &hdr.osa.u.sa,
.msg_namelen = sizeof(struct osmo_sockaddr),
};
if (iofd->mode == OSMO_IO_FD_MODE_RECVMSG_SENDMSG) {
hdr.hdr.msg_control = alloca(iofd->cmsg_size);
hdr.hdr.msg_controllen = iofd->cmsg_size;
}
rc = recvmsg(ofd->fd, &hdr.hdr, flags);
if (rc > 0)
msgb_put(msg, rc);
iofd_handle_recv(iofd, msg, (rc < 0 && errno > 0) ? -errno : rc, &hdr);
}
if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_CLOSED))
return;
if (what & OSMO_FD_WRITE) {
struct iofd_msghdr *msghdr = iofd_txqueue_dequeue(iofd);
if (msghdr) {
rc = sendmsg(ofd->fd, &msghdr->hdr, msghdr->flags);
iofd_handle_send_completion(iofd, (rc < 0 && errno > 0) ? -errno : rc, msghdr);
} else {
/* Socket is writable, but we have no data to send. A non-blocking/async
connect() is signalled this way. */
switch (iofd->mode) {
case OSMO_IO_FD_MODE_READ_WRITE:
iofd->io_ops.write_cb(iofd, 0, NULL);
break;
case OSMO_IO_FD_MODE_RECVFROM_SENDTO:
iofd->io_ops.sendto_cb(iofd, 0, NULL, NULL);
break;
case OSMO_IO_FD_MODE_RECVMSG_SENDMSG:
iofd->io_ops.sendmsg_cb(iofd, 0, NULL);
break;
default:
break;
}
if (osmo_iofd_txqueue_len(iofd) == 0)
iofd_poll_ops.write_disable(iofd);
}
}
}
static int iofd_poll_ofd_cb_dispatch(struct osmo_fd *ofd, unsigned int what)
{
struct osmo_io_fd *iofd = ofd->data;
IOFD_FLAG_SET(iofd, IOFD_FLAG_IN_CALLBACK);
iofd_poll_ofd_cb_recvmsg_sendmsg(ofd, what);
IOFD_FLAG_UNSET(iofd, IOFD_FLAG_IN_CALLBACK);
if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_TO_FREE)) {
talloc_free(iofd);
return 0;
}
return 0;
}
static int iofd_poll_register(struct osmo_io_fd *iofd)
{
struct osmo_fd *ofd = &iofd->u.poll.ofd;
int rc;
if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_FD_REGISTERED))
return 0;
osmo_fd_setup(ofd, iofd->fd, 0, &iofd_poll_ofd_cb_dispatch, iofd, 0);
rc = osmo_fd_register(ofd);
if (!rc)
IOFD_FLAG_SET(iofd, IOFD_FLAG_FD_REGISTERED);
return rc;
}
static int iofd_poll_unregister(struct osmo_io_fd *iofd)
{
struct osmo_fd *ofd = &iofd->u.poll.ofd;
if (!IOFD_FLAG_ISSET(iofd, IOFD_FLAG_FD_REGISTERED))
return 0;
osmo_fd_unregister(ofd);
IOFD_FLAG_UNSET(iofd, IOFD_FLAG_FD_REGISTERED);
return 0;
}
static int iofd_poll_close(struct osmo_io_fd *iofd)
{
iofd_poll_unregister(iofd);
osmo_fd_close(&iofd->u.poll.ofd);
return 0;
}
static void iofd_poll_read_enable(struct osmo_io_fd *iofd)
{
osmo_fd_read_enable(&iofd->u.poll.ofd);
}
static void iofd_poll_read_disable(struct osmo_io_fd *iofd)
{
osmo_fd_read_disable(&iofd->u.poll.ofd);
}
static void iofd_poll_write_enable(struct osmo_io_fd *iofd)
{
osmo_fd_write_enable(&iofd->u.poll.ofd);
}
static void iofd_poll_write_disable(struct osmo_io_fd *iofd)
{
osmo_fd_write_disable(&iofd->u.poll.ofd);
}
static void iofd_poll_notify_connected(struct osmo_io_fd *iofd)
{
int rc;
rc = iofd_poll_register(iofd);
if (rc < 0)
return;
osmo_fd_write_enable(&iofd->u.poll.ofd);
}
const struct iofd_backend_ops iofd_poll_ops = {
.register_fd = iofd_poll_register,
.unregister_fd = iofd_poll_unregister,
.close = iofd_poll_close,
.write_enable = iofd_poll_write_enable,
.write_disable = iofd_poll_write_disable,
.read_enable = iofd_poll_read_enable,
.read_disable = iofd_poll_read_disable,
.notify_connected = iofd_poll_notify_connected,
};
#endif /* ifndef EMBEDDED */
|
