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
|
/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "inotify_source.h"
#include "fifo_buffer.h"
#include "fd_util.h"
#include "mpd_error.h"
#include <sys/inotify.h>
#include <unistd.h>
#include <errno.h>
#include <stdbool.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "inotify"
struct mpd_inotify_source {
int fd;
GIOChannel *channel;
/**
* The channel's source id in the GLib main loop.
*/
guint id;
struct fifo_buffer *buffer;
mpd_inotify_callback_t callback;
void *callback_ctx;
};
/**
* A GQuark for GError instances.
*/
static inline GQuark
mpd_inotify_quark(void)
{
return g_quark_from_static_string("inotify");
}
static gboolean
mpd_inotify_in_event(G_GNUC_UNUSED GIOChannel *_source,
G_GNUC_UNUSED GIOCondition condition,
gpointer data)
{
struct mpd_inotify_source *source = data;
void *dest;
size_t length;
ssize_t nbytes;
const struct inotify_event *event;
dest = fifo_buffer_write(source->buffer, &length);
if (dest == NULL)
MPD_ERROR("buffer full");
nbytes = read(source->fd, dest, length);
if (nbytes < 0)
MPD_ERROR("failed to read from inotify: %s",
g_strerror(errno));
if (nbytes == 0)
MPD_ERROR("end of file from inotify");
fifo_buffer_append(source->buffer, nbytes);
while (true) {
const char *name;
event = fifo_buffer_read(source->buffer, &length);
if (event == NULL || length < sizeof(*event) ||
length < sizeof(*event) + event->len)
break;
if (event->len > 0 && event->name[event->len - 1] == 0)
name = event->name;
else
name = NULL;
source->callback(event->wd, event->mask, name,
source->callback_ctx);
fifo_buffer_consume(source->buffer,
sizeof(*event) + event->len);
}
return true;
}
struct mpd_inotify_source *
mpd_inotify_source_new(mpd_inotify_callback_t callback, void *callback_ctx,
GError **error_r)
{
struct mpd_inotify_source *source =
g_new(struct mpd_inotify_source, 1);
source->fd = inotify_init_cloexec();
if (source->fd < 0) {
g_set_error(error_r, mpd_inotify_quark(), errno,
"inotify_init() has failed: %s",
g_strerror(errno));
g_free(source);
return NULL;
}
source->buffer = fifo_buffer_new(4096);
source->channel = g_io_channel_unix_new(source->fd);
source->id = g_io_add_watch(source->channel, G_IO_IN,
mpd_inotify_in_event, source);
source->callback = callback;
source->callback_ctx = callback_ctx;
return source;
}
void
mpd_inotify_source_free(struct mpd_inotify_source *source)
{
g_source_remove(source->id);
g_io_channel_unref(source->channel);
fifo_buffer_free(source->buffer);
close(source->fd);
g_free(source);
}
int
mpd_inotify_source_add(struct mpd_inotify_source *source,
const char *path_fs, unsigned mask,
GError **error_r)
{
int wd = inotify_add_watch(source->fd, path_fs, mask);
if (wd < 0)
g_set_error(error_r, mpd_inotify_quark(), errno,
"inotify_add_watch() has failed: %s",
g_strerror(errno));
return wd;
}
void
mpd_inotify_source_rm(struct mpd_inotify_source *source, unsigned wd)
{
int ret = inotify_rm_watch(source->fd, wd);
if (ret < 0 && errno != EINVAL)
g_warning("inotify_rm_watch() has failed: %s",
g_strerror(errno));
/* EINVAL may happen here when the file has been deleted; the
kernel seems to auto-unregister deleted files */
}
|
