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
|
/*
* 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/time.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "conf.h"
#include "pipe.h"
struct fileops pipe_ops = {
"pipe",
sizeof(struct pipe),
pipe_close,
pipe_read,
pipe_write,
NULL, /* start */
NULL, /* stop */
pipe_nfds,
pipe_pollfd,
pipe_revents
};
struct pipe *
pipe_new(struct fileops *ops, int fd, char *name)
{
struct pipe *f;
f = (struct pipe *)file_new(ops, name, 1);
if (f == NULL)
return NULL;
f->fd = fd;
return f;
}
unsigned
pipe_read(struct file *file, unsigned char *data, unsigned count)
{
struct pipe *f = (struct pipe *)file;
int n;
#ifdef DEBUG
struct timeval tv0, tv1, dtv;
unsigned us;
if (!(f->file.state & FILE_ROK)) {
DPRINTF("pipe_read: %s: bad state\n", f->file.name);
abort();
}
gettimeofday(&tv0, NULL);
#endif
while ((n = read(f->fd, data, count)) < 0) {
f->file.state &= ~FILE_ROK;
if (errno == EAGAIN) {
DPRINTFN(3, "pipe_read: %s: blocking...\n",
f->file.name);
} else {
warn("%s", f->file.name);
file_eof(&f->file);
}
return 0;
}
if (n == 0) {
DPRINTFN(2, "pipe_read: %s: eof\n", f->file.name);
f->file.state &= ~FILE_ROK;
file_eof(&f->file);
return 0;
}
#ifdef DEBUG
gettimeofday(&tv1, NULL);
timersub(&tv1, &tv0, &dtv);
us = dtv.tv_sec * 1000000 + dtv.tv_usec;
DPRINTFN(us < 5000 ? 4 : 2,
"pipe_read: %s: got %d bytes in %uus\n",
f->file.name, n, us);
#endif
return n;
}
unsigned
pipe_write(struct file *file, unsigned char *data, unsigned count)
{
struct pipe *f = (struct pipe *)file;
int n;
#ifdef DEBUG
struct timeval tv0, tv1, dtv;
unsigned us;
if (!(f->file.state & FILE_WOK)) {
DPRINTF("pipe_write: %s: bad state\n", f->file.name);
abort();
}
gettimeofday(&tv0, NULL);
#endif
while ((n = write(f->fd, data, count)) < 0) {
f->file.state &= ~FILE_WOK;
if (errno == EAGAIN) {
DPRINTFN(3, "pipe_write: %s: blocking...\n",
f->file.name);
} else {
if (errno != EPIPE)
warn("%s", f->file.name);
file_hup(&f->file);
}
return 0;
}
#ifdef DEBUG
gettimeofday(&tv1, NULL);
timersub(&tv1, &tv0, &dtv);
us = dtv.tv_sec * 1000000 + dtv.tv_usec;
DPRINTFN(us < 5000 ? 4 : 2,
"pipe_write: %s: wrote %d bytes in %uus\n",
f->file.name, n, us);
#endif
return n;
}
int
pipe_nfds(struct file *file) {
return 1;
}
int
pipe_pollfd(struct file *file, struct pollfd *pfd, int events)
{
struct pipe *f = (struct pipe *)file;
pfd->fd = f->fd;
pfd->events = events;
return (events != 0) ? 1 : 0;
}
int
pipe_revents(struct file *f, struct pollfd *pfd)
{
return pfd->revents;
}
void
pipe_close(struct file *file)
{
struct pipe *f = (struct pipe *)file;
close(f->fd);
}
|
