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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; only version 2 | |
8 | * of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <assert.h> | |
22 | #include <fcntl.h> | |
23 | #include <poll.h> | |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/types.h> | |
30 | #include <unistd.h> | |
31 | ||
32 | #include <lttng-kernel-ctl.h> | |
33 | #include <lttng-sessiond-comm.h> | |
34 | #include <lttng/lttng-kconsumer.h> | |
35 | #include <lttngerr.h> | |
36 | ||
37 | extern struct lttng_consumer_global_data consumer_data; | |
38 | extern int consumer_poll_timeout; | |
39 | extern volatile int consumer_quit; | |
40 | ||
41 | /* | |
42 | * Mmap the ring buffer, read it and write the data to the tracefile. | |
43 | * | |
44 | * Returns the number of bytes written | |
45 | */ | |
46 | int lttng_kconsumer_on_read_subbuffer_mmap( | |
47 | struct lttng_consumer_local_data *ctx, | |
48 | struct lttng_consumer_stream *stream, unsigned long len) | |
49 | { | |
50 | unsigned long mmap_offset; | |
51 | long ret = 0; | |
52 | off_t orig_offset = stream->out_fd_offset; | |
53 | int fd = stream->wait_fd; | |
54 | int outfd = stream->out_fd; | |
55 | ||
56 | /* get the offset inside the fd to mmap */ | |
57 | ret = kernctl_get_mmap_read_offset(fd, &mmap_offset); | |
58 | if (ret != 0) { | |
59 | ret = -errno; | |
60 | perror("kernctl_get_mmap_read_offset"); | |
61 | goto end; | |
62 | } | |
63 | ||
64 | while (len > 0) { | |
65 | ret = write(outfd, stream->mmap_base + mmap_offset, len); | |
66 | if (ret >= len) { | |
67 | len = 0; | |
68 | } else if (ret < 0) { | |
69 | ret = -errno; | |
70 | perror("Error in file write"); | |
71 | goto end; | |
72 | } | |
73 | /* This won't block, but will start writeout asynchronously */ | |
74 | sync_file_range(outfd, stream->out_fd_offset, ret, | |
75 | SYNC_FILE_RANGE_WRITE); | |
76 | stream->out_fd_offset += ret; | |
77 | } | |
78 | ||
79 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
80 | ||
81 | goto end; | |
82 | ||
83 | end: | |
84 | return ret; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Splice the data from the ring buffer to the tracefile. | |
89 | * | |
90 | * Returns the number of bytes spliced. | |
91 | */ | |
92 | int lttng_kconsumer_on_read_subbuffer_splice( | |
93 | struct lttng_consumer_local_data *ctx, | |
94 | struct lttng_consumer_stream *stream, unsigned long len) | |
95 | { | |
96 | long ret = 0; | |
97 | loff_t offset = 0; | |
98 | off_t orig_offset = stream->out_fd_offset; | |
99 | int fd = stream->wait_fd; | |
100 | int outfd = stream->out_fd; | |
101 | ||
102 | while (len > 0) { | |
103 | DBG("splice chan to pipe offset %lu (fd : %d)", | |
104 | (unsigned long)offset, fd); | |
105 | ret = splice(fd, &offset, ctx->consumer_thread_pipe[1], NULL, len, | |
106 | SPLICE_F_MOVE | SPLICE_F_MORE); | |
107 | DBG("splice chan to pipe ret %ld", ret); | |
108 | if (ret < 0) { | |
109 | ret = errno; | |
110 | perror("Error in relay splice"); | |
111 | goto splice_error; | |
112 | } | |
113 | ||
114 | ret = splice(ctx->consumer_thread_pipe[0], NULL, outfd, NULL, ret, | |
115 | SPLICE_F_MOVE | SPLICE_F_MORE); | |
116 | DBG("splice pipe to file %ld", ret); | |
117 | if (ret < 0) { | |
118 | ret = errno; | |
119 | perror("Error in file splice"); | |
120 | goto splice_error; | |
121 | } | |
122 | len -= ret; | |
123 | /* This won't block, but will start writeout asynchronously */ | |
124 | sync_file_range(outfd, stream->out_fd_offset, ret, | |
125 | SYNC_FILE_RANGE_WRITE); | |
126 | stream->out_fd_offset += ret; | |
127 | } | |
128 | lttng_consumer_sync_trace_file(stream, orig_offset); | |
129 | ||
130 | goto end; | |
131 | ||
132 | splice_error: | |
133 | /* send the appropriate error description to sessiond */ | |
134 | switch(ret) { | |
135 | case EBADF: | |
136 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EBADF); | |
137 | break; | |
138 | case EINVAL: | |
139 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EINVAL); | |
140 | break; | |
141 | case ENOMEM: | |
142 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ENOMEM); | |
143 | break; | |
144 | case ESPIPE: | |
145 | lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ESPIPE); | |
146 | break; | |
147 | } | |
148 | ||
149 | end: | |
150 | return ret; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Take a snapshot for a specific fd | |
155 | * | |
156 | * Returns 0 on success, < 0 on error | |
157 | */ | |
158 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
159 | struct lttng_consumer_stream *stream) | |
160 | { | |
161 | int ret = 0; | |
162 | int infd = stream->wait_fd; | |
163 | ||
164 | ret = kernctl_snapshot(infd); | |
165 | if (ret != 0) { | |
166 | ret = errno; | |
167 | perror("Getting sub-buffer snapshot."); | |
168 | } | |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Get the produced position | |
175 | * | |
176 | * Returns 0 on success, < 0 on error | |
177 | */ | |
178 | int lttng_kconsumer_get_produced_snapshot( | |
179 | struct lttng_consumer_local_data *ctx, | |
180 | struct lttng_consumer_stream *stream, | |
181 | unsigned long *pos) | |
182 | { | |
183 | int ret; | |
184 | int infd = stream->wait_fd; | |
185 | ||
186 | ret = kernctl_snapshot_get_produced(infd, pos); | |
187 | if (ret != 0) { | |
188 | ret = errno; | |
189 | perror("kernctl_snapshot_get_produced"); | |
190 | } | |
191 | ||
192 | return ret; | |
193 | } | |
194 | ||
195 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, | |
196 | int sock, struct pollfd *consumer_sockpoll) | |
197 | { | |
198 | ssize_t ret; | |
199 | struct lttcomm_consumer_msg msg; | |
200 | ||
201 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
202 | if (ret != sizeof(msg)) { | |
f2fc6720 | 203 | lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_CMD); |
3bd1e081 MD |
204 | return ret; |
205 | } | |
206 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
207 | return -ENOENT; | |
208 | } | |
209 | ||
210 | switch (msg.cmd_type) { | |
211 | case LTTNG_CONSUMER_ADD_CHANNEL: | |
212 | { | |
213 | struct lttng_consumer_channel *new_channel; | |
214 | ||
215 | DBG("consumer_add_channel %d", msg.u.channel.channel_key); | |
216 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, | |
217 | -1, -1, | |
218 | msg.u.channel.mmap_len, | |
219 | msg.u.channel.max_sb_size); | |
220 | if (new_channel == NULL) { | |
221 | lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR); | |
222 | goto end_nosignal; | |
223 | } | |
224 | if (ctx->on_recv_channel != NULL) { | |
225 | ret = ctx->on_recv_channel(new_channel); | |
226 | if (ret == 0) { | |
227 | consumer_add_channel(new_channel); | |
228 | } else if (ret < 0) { | |
229 | goto end_nosignal; | |
230 | } | |
231 | } else { | |
232 | consumer_add_channel(new_channel); | |
233 | } | |
234 | goto end_nosignal; | |
235 | } | |
236 | case LTTNG_CONSUMER_ADD_STREAM: | |
237 | { | |
238 | struct lttng_consumer_stream *new_stream; | |
f2fc6720 | 239 | int fd; |
3bd1e081 MD |
240 | |
241 | /* block */ | |
242 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
243 | return -EINTR; | |
244 | } | |
f2fc6720 MD |
245 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
246 | if (ret != sizeof(fd)) { | |
3bd1e081 MD |
247 | lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_FD); |
248 | return ret; | |
249 | } | |
3bd1e081 | 250 | |
f2fc6720 MD |
251 | DBG("consumer_add_stream %s (%d)", msg.u.stream.path_name, |
252 | fd); | |
3bd1e081 MD |
253 | new_stream = consumer_allocate_stream(msg.u.stream.channel_key, |
254 | msg.u.stream.stream_key, | |
f2fc6720 | 255 | fd, fd, |
3bd1e081 MD |
256 | msg.u.stream.state, |
257 | msg.u.stream.mmap_len, | |
258 | msg.u.stream.output, | |
259 | msg.u.stream.path_name); | |
260 | if (new_stream == NULL) { | |
261 | lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR); | |
262 | goto end; | |
263 | } | |
264 | if (ctx->on_recv_stream != NULL) { | |
265 | ret = ctx->on_recv_stream(new_stream); | |
266 | if (ret == 0) { | |
267 | consumer_add_stream(new_stream); | |
268 | } else if (ret < 0) { | |
269 | goto end; | |
270 | } | |
271 | } else { | |
272 | consumer_add_stream(new_stream); | |
273 | } | |
274 | break; | |
275 | } | |
276 | case LTTNG_CONSUMER_UPDATE_STREAM: | |
277 | { | |
278 | if (ctx->on_update_stream != NULL) { | |
279 | ret = ctx->on_update_stream(msg.u.stream.stream_key, msg.u.stream.state); | |
280 | if (ret == 0) { | |
281 | consumer_change_stream_state(msg.u.stream.stream_key, msg.u.stream.state); | |
282 | } else if (ret < 0) { | |
283 | goto end; | |
284 | } | |
285 | } else { | |
286 | consumer_change_stream_state(msg.u.stream.stream_key, | |
287 | msg.u.stream.state); | |
288 | } | |
289 | break; | |
290 | } | |
291 | default: | |
292 | break; | |
293 | } | |
294 | end: | |
295 | /* signal the poll thread */ | |
296 | ret = write(ctx->consumer_poll_pipe[1], "4", 1); | |
297 | if (ret < 0) { | |
298 | perror("write consumer poll"); | |
299 | } | |
300 | end_nosignal: | |
301 | return 0; | |
302 | } |