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
202
203
204
205
206
207
208
209
210
211
|
/* $OpenBSD: mio_rmidi.c,v 1.27 2018/09/19 16:21:00 miko Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "debug.h"
#include "mio_priv.h"
#define DEVPATH_PREFIX "/dev/rmidi"
#define DEVPATH_MAX (1 + \
sizeof(DEVPATH_PREFIX) - 1 + \
sizeof(int) * 3)
struct mio_rmidi_hdl {
struct mio_hdl mio;
int fd;
};
static void mio_rmidi_close(struct mio_hdl *);
static size_t mio_rmidi_read(struct mio_hdl *, void *, size_t);
static size_t mio_rmidi_write(struct mio_hdl *, const void *, size_t);
static int mio_rmidi_nfds(struct mio_hdl *);
static int mio_rmidi_pollfd(struct mio_hdl *, struct pollfd *, int);
static int mio_rmidi_revents(struct mio_hdl *, struct pollfd *);
static struct mio_ops mio_rmidi_ops = {
mio_rmidi_close,
mio_rmidi_write,
mio_rmidi_read,
mio_rmidi_nfds,
mio_rmidi_pollfd,
mio_rmidi_revents
};
int
mio_rmidi_getfd(const char *str, unsigned int mode, int nbio)
{
const char *p;
char path[DEVPATH_MAX];
unsigned int devnum;
int fd, flags;
#ifdef DEBUG
_sndio_debug_init();
#endif
p = _sndio_parsetype(str, "rmidi");
if (p == NULL) {
DPRINTF("mio_rmidi_getfd: %s: \"rmidi\" expected\n", str);
return -1;
}
switch (*p) {
case '/':
p++;
break;
default:
DPRINTF("mio_rmidi_getfd: %s: '/' expected\n", str);
return -1;
}
p = _sndio_parsenum(p, &devnum, 255);
if (p == NULL) {
DPRINTF("mio_rmidi_getfd: %s: number expected after '/'\n", str);
return -1;
}
if (*p != '\0') {
DPRINTF("mio_rmidi_getfd: junk at end of string: %s\n", p);
return -1;
}
snprintf(path, sizeof(path), DEVPATH_PREFIX "%u", devnum);
if (mode == (MIO_IN | MIO_OUT))
flags = O_RDWR;
else
flags = (mode & MIO_OUT) ? O_WRONLY : O_RDONLY;
while ((fd = open(path, flags | O_NONBLOCK | O_CLOEXEC)) < 0) {
if (errno == EINTR)
continue;
DPERROR(path);
return -1;
}
return fd;
}
struct mio_hdl *
mio_rmidi_fdopen(int fd, unsigned int mode, int nbio)
{
struct mio_rmidi_hdl *hdl;
#ifdef DEBUG
_sndio_debug_init();
#endif
hdl = malloc(sizeof(struct mio_rmidi_hdl));
if (hdl == NULL)
return NULL;
_mio_create(&hdl->mio, &mio_rmidi_ops, mode, nbio);
hdl->fd = fd;
return (struct mio_hdl *)hdl;
}
struct mio_hdl *
_mio_rmidi_open(const char *str, unsigned int mode, int nbio)
{
struct mio_hdl *hdl;
int fd;
fd = mio_rmidi_getfd(str, mode, nbio);
if (fd < 0)
return NULL;
hdl = mio_rmidi_fdopen(fd, mode, nbio);
if (hdl != NULL)
return hdl;
while (close(fd) < 0 && errno == EINTR)
; /* retry */
return NULL;
}
static void
mio_rmidi_close(struct mio_hdl *sh)
{
struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh;
int rc;
do {
rc = close(hdl->fd);
} while (rc < 0 && errno == EINTR);
free(hdl);
}
static size_t
mio_rmidi_read(struct mio_hdl *sh, void *buf, size_t len)
{
struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh;
ssize_t n;
while ((n = read(hdl->fd, buf, len)) < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
DPERROR("mio_rmidi_read: read");
hdl->mio.eof = 1;
}
return 0;
}
if (n == 0) {
DPRINTF("mio_rmidi_read: eof\n");
hdl->mio.eof = 1;
return 0;
}
return n;
}
static size_t
mio_rmidi_write(struct mio_hdl *sh, const void *buf, size_t len)
{
struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh;
ssize_t n;
while ((n = write(hdl->fd, buf, len)) < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
DPERROR("mio_rmidi_write: write");
hdl->mio.eof = 1;
}
return 0;
}
return n;
}
static int
mio_rmidi_nfds(struct mio_hdl *sh)
{
return 1;
}
static int
mio_rmidi_pollfd(struct mio_hdl *sh, struct pollfd *pfd, int events)
{
struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh;
pfd->fd = hdl->fd;
pfd->events = events;
return 1;
}
static int
mio_rmidi_revents(struct mio_hdl *sh, struct pollfd *pfd)
{
return pfd->revents;
}
|
