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
|
#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "iochannel.h"
struct iochannel {
int ifd, ofd;
struct mainloop* mainloop;
void (*callback)(struct iochannel*io, void *userdata);
void*userdata;
int readable;
int writable;
struct mainloop_source* input_source, *output_source;
};
static void enable_mainloop_sources(struct iochannel *io) {
assert(io);
if (io->input_source == io->output_source) {
enum mainloop_io_event e = MAINLOOP_IO_EVENT_NULL;
assert(io->input_source);
if (!io->readable)
e |= MAINLOOP_IO_EVENT_IN;
if (!io->writable)
e |= MAINLOOP_IO_EVENT_OUT;
mainloop_source_io_set_events(io->input_source, e);
} else {
if (io->input_source)
mainloop_source_io_set_events(io->input_source, io->readable ? MAINLOOP_IO_EVENT_NULL : MAINLOOP_IO_EVENT_IN);
if (io->output_source)
mainloop_source_io_set_events(io->output_source, io->writable ? MAINLOOP_IO_EVENT_NULL : MAINLOOP_IO_EVENT_OUT);
}
}
static void callback(struct mainloop_source*s, int fd, enum mainloop_io_event events, void *userdata) {
struct iochannel *io = userdata;
int changed;
assert(s && fd >= 0 && userdata);
if (events & MAINLOOP_IO_EVENT_IN && !io->readable) {
io->readable = 1;
changed = 1;
}
if (events & MAINLOOP_IO_EVENT_OUT && !io->writable) {
io->writable = 1;
changed = 1;
}
if (changed) {
enable_mainloop_sources(io);
if (io->callback)
io->callback(io, io->userdata);
}
}
static void make_nonblock_fd(int fd) {
int v;
if ((v = fcntl(fd, F_GETFL)) >= 0)
if (!(v & O_NONBLOCK))
fcntl(fd, F_SETFL, v|O_NONBLOCK);
}
struct iochannel* iochannel_new(struct mainloop*m, int ifd, int ofd) {
struct iochannel *io;
assert(m && (ifd >= 0 || ofd >= 0));
io = malloc(sizeof(struct iochannel));
io->ifd = ifd;
io->ofd = ofd;
io->mainloop = m;
io->userdata = NULL;
io->callback = NULL;
io->readable = 0;
io->writable = 0;
if (ifd == ofd) {
assert(ifd >= 0);
make_nonblock_fd(io->ifd);
io->input_source = io->output_source = mainloop_source_new_io(m, ifd, MAINLOOP_IO_EVENT_IN|MAINLOOP_IO_EVENT_OUT, callback, io);
} else {
if (ifd >= 0) {
make_nonblock_fd(io->ifd);
io->input_source = mainloop_source_new_io(m, ifd, MAINLOOP_IO_EVENT_IN, callback, io);
} else
io->input_source = NULL;
if (ofd >= 0) {
make_nonblock_fd(io->ofd);
io->output_source = mainloop_source_new_io(m, ofd, MAINLOOP_IO_EVENT_OUT, callback, io);
} else
io->output_source = NULL;
}
return io;
}
void iochannel_free(struct iochannel*io) {
assert(io);
if (io->ifd >= 0)
close(io->ifd);
if (io->ofd >= 0 && io->ofd != io->ifd)
close(io->ofd);
if (io->input_source)
mainloop_source_free(io->input_source);
if (io->output_source)
mainloop_source_free(io->output_source);
free(io);
}
int iochannel_is_readable(struct iochannel*io) {
assert(io);
return io->readable;
}
int iochannel_is_writable(struct iochannel*io) {
assert(io);
return io->writable;
}
ssize_t iochannel_write(struct iochannel*io, const void*data, size_t l) {
ssize_t r;
assert(io && data && l && io->ofd >= 0);
if ((r = write(io->ofd, data, l)) >= 0) {
io->writable = 0;
enable_mainloop_sources(io);
}
return r;
}
ssize_t iochannel_read(struct iochannel*io, void*data, size_t l) {
ssize_t r;
assert(io && data && l && io->ifd >= 0);
if ((r = read(io->ifd, data, l)) >= 0) {
io->readable = 0;
enable_mainloop_sources(io);
}
return r;
}
|
