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
|
/* Timer handling
*
* (C) 2023 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* Inspired by libosmocore
*
* 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 3 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <math.h>
#include <errno.h>
#include <string.h>
#include <sys/select.h>
#include <sys/time.h>
#include "select.h"
//#define DEBUG
#define MAX_OFD 1024
struct osmo_fd *ofd_list = NULL;
int ofd_changed = 0;
int osmo_fd_register(struct osmo_fd *ofd)
{
struct osmo_fd **ofdp;
/* attach to list, if not already */
ofdp = &ofd_list;
while (*ofdp) {
if (*ofdp == ofd)
break;
ofdp = &((*ofdp)->next);
}
if (!*ofdp) {
#ifdef DEBUG
fprintf(stderr, "%s: ofd=%p fd=%d registers.\n", __func__, ofd, ofd->fd);
#endif
ofd->next = NULL;
*ofdp = ofd;
ofd_changed = 1;
}
return 0;
}
void osmo_fd_unregister(struct osmo_fd *ofd)
{
struct osmo_fd **ofdp;
/* detach from list, if not already */
ofdp = &ofd_list;
while (*ofdp) {
if (*ofdp == ofd)
break;
ofdp = &((*ofdp)->next);
}
if (*ofdp) {
#ifdef DEBUG
fprintf(stderr, "%s: ofd=%p fd=%d unregisters.\n", __func__, ofd, ofd->fd);
#endif
*ofdp = ofd->next;
ofd->next = NULL;
ofd_changed = 1;
}
}
int osmo_fd_select(double timeout)
{
fd_set readset;
fd_set writeset;
fd_set exceptset;
struct osmo_fd *ofd;
struct timeval tv;
int max_fd;
unsigned int what;
int work = 0;
int rc;
/* init event sets */
FD_ZERO(&readset);
FD_ZERO(&writeset);
FD_ZERO(&exceptset);
/* populate event set with all file descriptios */
ofd = ofd_list;
max_fd = 0;
while (ofd) {
if (ofd->fd > max_fd)
max_fd = ofd->fd;
if (ofd->when & OSMO_FD_READ)
FD_SET(ofd->fd, &readset);
if (ofd->when & OSMO_FD_WRITE)
FD_SET(ofd->fd, &writeset);
if (ofd->when & OSMO_FD_EXCEPT)
FD_SET(ofd->fd, &exceptset);
ofd = ofd->next;
}
if (timeout >= 0) {
/* prepare timeout */
tv.tv_sec = floor(timeout);
tv.tv_usec = (timeout - tv.tv_sec) * 1000000.0;
/* wait for event or timeout */
rc = select(max_fd + 1, &readset, &writeset, &exceptset, &tv);
} else {
/* wait for event */
rc = select(max_fd + 1, &readset, &writeset, &exceptset, NULL);
}
if (rc < 0) {
if (errno != EINTR)
fprintf(stderr, "%s: select() failed: '%d' with errno %d (%s) Please fix!\n", __func__, rc, errno, strerror(errno));
return 0;
}
again:
/* check the result and call handler */
ofd_changed = 0;
ofd = ofd_list;
while (ofd) {
what = 0;
if (FD_ISSET(ofd->fd, &readset)) {
#ifdef DEBUG
fprintf(stderr, "%s: ofd=%p fd=%d get READ event.\n", __func__, ofd, ofd->fd);
#endif
what |= OSMO_FD_READ;
FD_CLR(ofd->fd, &readset);
}
if (FD_ISSET(ofd->fd, &writeset)) {
#ifdef DEBUG
fprintf(stderr, "%s: ofd=%p fd=%d get WRITE event.\n", __func__, ofd, ofd->fd);
#endif
what |= OSMO_FD_WRITE;
FD_CLR(ofd->fd, &writeset);
}
if (FD_ISSET(ofd->fd, &exceptset)) {
#ifdef DEBUG
fprintf(stderr, "%s: ofd=%p fd=%d get EXCEPTION event.\n", __func__, ofd, ofd->fd);
#endif
what |= OSMO_FD_EXCEPT;
FD_CLR(ofd->fd, &exceptset);
}
if (what) {
work = 1;
ofd->cb(ofd, what);
/* list has changed */
if (ofd_changed)
goto again;
}
ofd = ofd->next;
}
return work;
}
|
