]>
Commit | Line | Data |
---|---|---|
d6e48869 DB |
1 | /* |
2 | * QEMU I/O channels files driver | |
3 | * | |
4 | * Copyright (c) 2015 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
c8198bd5 | 9 | * version 2.1 of the License, or (at your option) any later version. |
d6e48869 DB |
10 | * |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
cae9fc56 | 21 | #include "qemu/osdep.h" |
d6e48869 | 22 | #include "io/channel-file.h" |
06e0f098 | 23 | #include "io/channel-util.h" |
d6e48869 | 24 | #include "io/channel-watch.h" |
da34e65c | 25 | #include "qapi/error.h" |
0b8fa32f | 26 | #include "qemu/module.h" |
d6e48869 DB |
27 | #include "qemu/sockets.h" |
28 | #include "trace.h" | |
29 | ||
30 | QIOChannelFile * | |
31 | qio_channel_file_new_fd(int fd) | |
32 | { | |
33 | QIOChannelFile *ioc; | |
34 | ||
35 | ioc = QIO_CHANNEL_FILE(object_new(TYPE_QIO_CHANNEL_FILE)); | |
36 | ||
37 | ioc->fd = fd; | |
38 | ||
39 | trace_qio_channel_file_new_fd(ioc, fd); | |
40 | ||
41 | return ioc; | |
42 | } | |
43 | ||
44 | ||
45 | QIOChannelFile * | |
46 | qio_channel_file_new_path(const char *path, | |
47 | int flags, | |
48 | mode_t mode, | |
49 | Error **errp) | |
50 | { | |
51 | QIOChannelFile *ioc; | |
52 | ||
53 | ioc = QIO_CHANNEL_FILE(object_new(TYPE_QIO_CHANNEL_FILE)); | |
54 | ||
448058aa | 55 | ioc->fd = qemu_open_old(path, flags, mode); |
d6e48869 DB |
56 | if (ioc->fd < 0) { |
57 | object_unref(OBJECT(ioc)); | |
58 | error_setg_errno(errp, errno, | |
59 | "Unable to open %s", path); | |
60 | return NULL; | |
61 | } | |
62 | ||
63 | trace_qio_channel_file_new_path(ioc, path, flags, mode, ioc->fd); | |
64 | ||
65 | return ioc; | |
66 | } | |
67 | ||
68 | ||
69 | static void qio_channel_file_init(Object *obj) | |
70 | { | |
71 | QIOChannelFile *ioc = QIO_CHANNEL_FILE(obj); | |
72 | ioc->fd = -1; | |
73 | } | |
74 | ||
75 | static void qio_channel_file_finalize(Object *obj) | |
76 | { | |
77 | QIOChannelFile *ioc = QIO_CHANNEL_FILE(obj); | |
78 | if (ioc->fd != -1) { | |
b8f244b1 | 79 | qemu_close(ioc->fd); |
d6e48869 DB |
80 | ioc->fd = -1; |
81 | } | |
82 | } | |
83 | ||
84 | ||
85 | static ssize_t qio_channel_file_readv(QIOChannel *ioc, | |
86 | const struct iovec *iov, | |
87 | size_t niov, | |
88 | int **fds, | |
89 | size_t *nfds, | |
84615a19 | 90 | int flags, |
d6e48869 DB |
91 | Error **errp) |
92 | { | |
93 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); | |
94 | ssize_t ret; | |
95 | ||
96 | retry: | |
97 | ret = readv(fioc->fd, iov, niov); | |
98 | if (ret < 0) { | |
30fd3e27 | 99 | if (errno == EAGAIN) { |
d6e48869 DB |
100 | return QIO_CHANNEL_ERR_BLOCK; |
101 | } | |
102 | if (errno == EINTR) { | |
103 | goto retry; | |
104 | } | |
105 | ||
106 | error_setg_errno(errp, errno, | |
107 | "Unable to read from file"); | |
108 | return -1; | |
109 | } | |
110 | ||
111 | return ret; | |
112 | } | |
113 | ||
114 | static ssize_t qio_channel_file_writev(QIOChannel *ioc, | |
115 | const struct iovec *iov, | |
116 | size_t niov, | |
117 | int *fds, | |
118 | size_t nfds, | |
b88651cb | 119 | int flags, |
d6e48869 DB |
120 | Error **errp) |
121 | { | |
122 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); | |
123 | ssize_t ret; | |
124 | ||
125 | retry: | |
126 | ret = writev(fioc->fd, iov, niov); | |
127 | if (ret <= 0) { | |
30fd3e27 | 128 | if (errno == EAGAIN) { |
d6e48869 DB |
129 | return QIO_CHANNEL_ERR_BLOCK; |
130 | } | |
131 | if (errno == EINTR) { | |
132 | goto retry; | |
133 | } | |
134 | error_setg_errno(errp, errno, | |
135 | "Unable to write to file"); | |
136 | return -1; | |
137 | } | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static int qio_channel_file_set_blocking(QIOChannel *ioc, | |
142 | bool enabled, | |
143 | Error **errp) | |
144 | { | |
17fc1245 MAL |
145 | #ifdef WIN32 |
146 | /* not implemented */ | |
147 | error_setg_errno(errp, errno, "Failed to set FD nonblocking"); | |
148 | return -1; | |
149 | #else | |
d6e48869 DB |
150 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); |
151 | ||
17fc1245 MAL |
152 | if (!g_unix_set_fd_nonblocking(fioc->fd, !enabled, NULL)) { |
153 | error_setg_errno(errp, errno, "Failed to set FD nonblocking"); | |
154 | return -1; | |
d6e48869 DB |
155 | } |
156 | return 0; | |
17fc1245 | 157 | #endif |
d6e48869 DB |
158 | } |
159 | ||
160 | ||
161 | static off_t qio_channel_file_seek(QIOChannel *ioc, | |
162 | off_t offset, | |
163 | int whence, | |
164 | Error **errp) | |
165 | { | |
166 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); | |
167 | off_t ret; | |
168 | ||
169 | ret = lseek(fioc->fd, offset, whence); | |
170 | if (ret == (off_t)-1) { | |
171 | error_setg_errno(errp, errno, | |
172 | "Unable to seek to offset %lld whence %d in file", | |
173 | (long long int)offset, whence); | |
174 | return -1; | |
175 | } | |
176 | return ret; | |
177 | } | |
178 | ||
179 | ||
180 | static int qio_channel_file_close(QIOChannel *ioc, | |
181 | Error **errp) | |
182 | { | |
183 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); | |
184 | ||
b8f244b1 | 185 | if (qemu_close(fioc->fd) < 0) { |
d6e48869 DB |
186 | error_setg_errno(errp, errno, |
187 | "Unable to close file"); | |
188 | return -1; | |
189 | } | |
a2565df1 | 190 | fioc->fd = -1; |
d6e48869 DB |
191 | return 0; |
192 | } | |
193 | ||
194 | ||
bf88c124 | 195 | static void qio_channel_file_set_aio_fd_handler(QIOChannel *ioc, |
06e0f098 | 196 | AioContext *read_ctx, |
bf88c124 | 197 | IOHandler *io_read, |
06e0f098 | 198 | AioContext *write_ctx, |
bf88c124 PB |
199 | IOHandler *io_write, |
200 | void *opaque) | |
201 | { | |
202 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); | |
06e0f098 SH |
203 | |
204 | qio_channel_util_set_aio_fd_handler(fioc->fd, read_ctx, io_read, | |
205 | fioc->fd, write_ctx, io_write, | |
206 | opaque); | |
bf88c124 PB |
207 | } |
208 | ||
d6e48869 DB |
209 | static GSource *qio_channel_file_create_watch(QIOChannel *ioc, |
210 | GIOCondition condition) | |
211 | { | |
212 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc); | |
213 | return qio_channel_create_fd_watch(ioc, | |
214 | fioc->fd, | |
215 | condition); | |
216 | } | |
217 | ||
218 | static void qio_channel_file_class_init(ObjectClass *klass, | |
219 | void *class_data G_GNUC_UNUSED) | |
220 | { | |
221 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
222 | ||
223 | ioc_klass->io_writev = qio_channel_file_writev; | |
224 | ioc_klass->io_readv = qio_channel_file_readv; | |
225 | ioc_klass->io_set_blocking = qio_channel_file_set_blocking; | |
226 | ioc_klass->io_seek = qio_channel_file_seek; | |
227 | ioc_klass->io_close = qio_channel_file_close; | |
228 | ioc_klass->io_create_watch = qio_channel_file_create_watch; | |
bf88c124 | 229 | ioc_klass->io_set_aio_fd_handler = qio_channel_file_set_aio_fd_handler; |
d6e48869 DB |
230 | } |
231 | ||
232 | static const TypeInfo qio_channel_file_info = { | |
233 | .parent = TYPE_QIO_CHANNEL, | |
234 | .name = TYPE_QIO_CHANNEL_FILE, | |
235 | .instance_size = sizeof(QIOChannelFile), | |
236 | .instance_init = qio_channel_file_init, | |
237 | .instance_finalize = qio_channel_file_finalize, | |
238 | .class_init = qio_channel_file_class_init, | |
239 | }; | |
240 | ||
241 | static void qio_channel_file_register_types(void) | |
242 | { | |
243 | type_register_static(&qio_channel_file_info); | |
244 | } | |
245 | ||
246 | type_init(qio_channel_file_register_types); |