1 /*
2 * Copyright (C) 2007-2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <fcntl.h>
19 #ifdef HAVE_PTHREADS
20 #include <pthread.h>
21 #endif
22 #include <stdarg.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 #include <time.h>
29 #include <unistd.h>
30
31 #ifdef __BIONIC__
32 #include <android/set_abort_message.h>
33 #endif
34
35 #include <log/log.h>
36 #include <log/logd.h>
37 #include <log/logger.h>
38
39 #define LOGGER_LOG_MAIN "log/main"
40 #define LOGGER_LOG_RADIO "log/radio"
41 #define LOGGER_LOG_EVENTS "log/events"
42 #define LOGGER_LOG_SYSTEM "log/system"
43
44 #define LOG_BUF_SIZE 1024
45
46 #if FAKE_LOG_DEVICE
47 /* This will be defined when building for the host. */
48 #include "fake_log_device.h"
49 #define log_open(pathname, flags) fakeLogOpen(pathname, flags)
50 #define log_writev(filedes, vector, count) fakeLogWritev(filedes, vector, count)
51 #define log_close(filedes) fakeLogClose(filedes)
52 #else
53 #define log_open(pathname, flags) open(pathname, (flags) | O_CLOEXEC)
54 #define log_writev(filedes, vector, count) writev(filedes, vector, count)
55 #define log_close(filedes) close(filedes)
56 #endif
57
58 static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
59 static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
60 #ifdef HAVE_PTHREADS
61 static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
62 #endif
63
64 #ifndef __unused
65 #define __unused __attribute__((__unused__))
66 #endif
67
68 static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1 };
69
70 /*
71 * This is used by the C++ code to decide if it should write logs through
72 * the C code. Basically, if /dev/log/... is available, we're running in
73 * the simulator rather than a desktop tool and want to use the device.
74 */
75 static enum {
76 kLogUninitialized, kLogNotAvailable, kLogAvailable
77 } g_log_status = kLogUninitialized;
__android_log_dev_available(void)78 int __android_log_dev_available(void)
79 {
80 if (g_log_status == kLogUninitialized) {
81 if (access("/dev/"LOGGER_LOG_MAIN, W_OK) == 0)
82 g_log_status = kLogAvailable;
83 else
84 g_log_status = kLogNotAvailable;
85 }
86
87 return (g_log_status == kLogAvailable);
88 }
89
__write_to_log_null(log_id_t log_fd __unused,struct iovec * vec __unused,size_t nr __unused)90 static int __write_to_log_null(log_id_t log_fd __unused, struct iovec *vec __unused,
91 size_t nr __unused)
92 {
93 return -1;
94 }
95
__write_to_log_kernel(log_id_t log_id,struct iovec * vec,size_t nr)96 static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
97 {
98 ssize_t ret;
99 int log_fd;
100
101 if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) {
102 if (log_id == LOG_ID_CRASH) {
103 log_id = LOG_ID_MAIN;
104 }
105 log_fd = log_fds[(int)log_id];
106 } else {
107 return -EBADF;
108 }
109
110 do {
111 ret = log_writev(log_fd, vec, nr);
112 if (ret < 0) {
113 ret = -errno;
114 }
115 } while (ret == -EINTR);
116
117 return ret;
118 }
119
__write_to_log_init(log_id_t log_id,struct iovec * vec,size_t nr)120 static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
121 {
122 #ifdef HAVE_PTHREADS
123 pthread_mutex_lock(&log_init_lock);
124 #endif
125
126 if (write_to_log == __write_to_log_init) {
127 log_fds[LOG_ID_MAIN] = log_open("/dev/"LOGGER_LOG_MAIN, O_WRONLY);
128 log_fds[LOG_ID_RADIO] = log_open("/dev/"LOGGER_LOG_RADIO, O_WRONLY);
129 log_fds[LOG_ID_EVENTS] = log_open("/dev/"LOGGER_LOG_EVENTS, O_WRONLY);
130 log_fds[LOG_ID_SYSTEM] = log_open("/dev/"LOGGER_LOG_SYSTEM, O_WRONLY);
131
132 write_to_log = __write_to_log_kernel;
133
134 if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0 ||
135 log_fds[LOG_ID_EVENTS] < 0) {
136 log_close(log_fds[LOG_ID_MAIN]);
137 log_close(log_fds[LOG_ID_RADIO]);
138 log_close(log_fds[LOG_ID_EVENTS]);
139 log_fds[LOG_ID_MAIN] = -1;
140 log_fds[LOG_ID_RADIO] = -1;
141 log_fds[LOG_ID_EVENTS] = -1;
142 write_to_log = __write_to_log_null;
143 }
144
145 if (log_fds[LOG_ID_SYSTEM] < 0) {
146 log_fds[LOG_ID_SYSTEM] = log_fds[LOG_ID_MAIN];
147 }
148 }
149
150 #ifdef HAVE_PTHREADS
151 pthread_mutex_unlock(&log_init_lock);
152 #endif
153
154 return write_to_log(log_id, vec, nr);
155 }
156
__android_log_write(int prio,const char * tag,const char * msg)157 int __android_log_write(int prio, const char *tag, const char *msg)
158 {
159 struct iovec vec[3];
160 log_id_t log_id = LOG_ID_MAIN;
161 char tmp_tag[32];
162
163 if (!tag)
164 tag = "";
165
166 /* XXX: This needs to go! */
167 if (!strcmp(tag, "HTC_RIL") ||
168 !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
169 !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
170 !strcmp(tag, "AT") ||
171 !strcmp(tag, "GSM") ||
172 !strcmp(tag, "STK") ||
173 !strcmp(tag, "CDMA") ||
174 !strcmp(tag, "PHONE") ||
175 !strcmp(tag, "SMS")) {
176 log_id = LOG_ID_RADIO;
177 /* Inform third party apps/ril/radio.. to use Rlog or RLOG */
178 snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
179 tag = tmp_tag;
180 }
181
182 #if __BIONIC__
183 if (prio == ANDROID_LOG_FATAL) {
184 android_set_abort_message(msg);
185 }
186 #endif
187
188 vec[0].iov_base = (unsigned char *) &prio;
189 vec[0].iov_len = 1;
190 vec[1].iov_base = (void *) tag;
191 vec[1].iov_len = strlen(tag) + 1;
192 vec[2].iov_base = (void *) msg;
193 vec[2].iov_len = strlen(msg) + 1;
194
195 return write_to_log(log_id, vec, 3);
196 }
197
__android_log_buf_write(int bufID,int prio,const char * tag,const char * msg)198 int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
199 {
200 struct iovec vec[3];
201 char tmp_tag[32];
202
203 if (!tag)
204 tag = "";
205
206 /* XXX: This needs to go! */
207 if ((bufID != LOG_ID_RADIO) &&
208 (!strcmp(tag, "HTC_RIL") ||
209 !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
210 !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
211 !strcmp(tag, "AT") ||
212 !strcmp(tag, "GSM") ||
213 !strcmp(tag, "STK") ||
214 !strcmp(tag, "CDMA") ||
215 !strcmp(tag, "PHONE") ||
216 !strcmp(tag, "SMS"))) {
217 bufID = LOG_ID_RADIO;
218 /* Inform third party apps/ril/radio.. to use Rlog or RLOG */
219 snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
220 tag = tmp_tag;
221 }
222
223 vec[0].iov_base = (unsigned char *) &prio;
224 vec[0].iov_len = 1;
225 vec[1].iov_base = (void *) tag;
226 vec[1].iov_len = strlen(tag) + 1;
227 vec[2].iov_base = (void *) msg;
228 vec[2].iov_len = strlen(msg) + 1;
229
230 return write_to_log(bufID, vec, 3);
231 }
232
__android_log_vprint(int prio,const char * tag,const char * fmt,va_list ap)233 int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap)
234 {
235 char buf[LOG_BUF_SIZE];
236
237 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
238
239 return __android_log_write(prio, tag, buf);
240 }
241
__android_log_print(int prio,const char * tag,const char * fmt,...)242 int __android_log_print(int prio, const char *tag, const char *fmt, ...)
243 {
244 va_list ap;
245 char buf[LOG_BUF_SIZE];
246
247 va_start(ap, fmt);
248 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
249 va_end(ap);
250
251 return __android_log_write(prio, tag, buf);
252 }
253
__android_log_buf_print(int bufID,int prio,const char * tag,const char * fmt,...)254 int __android_log_buf_print(int bufID, int prio, const char *tag, const char *fmt, ...)
255 {
256 va_list ap;
257 char buf[LOG_BUF_SIZE];
258
259 va_start(ap, fmt);
260 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
261 va_end(ap);
262
263 return __android_log_buf_write(bufID, prio, tag, buf);
264 }
265
__android_log_assert(const char * cond,const char * tag,const char * fmt,...)266 void __android_log_assert(const char *cond, const char *tag,
267 const char *fmt, ...)
268 {
269 char buf[LOG_BUF_SIZE];
270
271 if (fmt) {
272 va_list ap;
273 va_start(ap, fmt);
274 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
275 va_end(ap);
276 } else {
277 /* Msg not provided, log condition. N.B. Do not use cond directly as
278 * format string as it could contain spurious '%' syntax (e.g.
279 * "%d" in "blocks%devs == 0").
280 */
281 if (cond)
282 snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
283 else
284 strcpy(buf, "Unspecified assertion failed");
285 }
286
287 __android_log_write(ANDROID_LOG_FATAL, tag, buf);
288 __builtin_trap(); /* trap so we have a chance to debug the situation */
289 /* NOTREACHED */
290 }
291
__android_log_bwrite(int32_t tag,const void * payload,size_t len)292 int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
293 {
294 struct iovec vec[2];
295
296 vec[0].iov_base = &tag;
297 vec[0].iov_len = sizeof(tag);
298 vec[1].iov_base = (void*)payload;
299 vec[1].iov_len = len;
300
301 return write_to_log(LOG_ID_EVENTS, vec, 2);
302 }
303
304 /*
305 * Like __android_log_bwrite, but takes the type as well. Doesn't work
306 * for the general case where we're generating lists of stuff, but very
307 * handy if we just want to dump an integer into the log.
308 */
__android_log_btwrite(int32_t tag,char type,const void * payload,size_t len)309 int __android_log_btwrite(int32_t tag, char type, const void *payload,
310 size_t len)
311 {
312 struct iovec vec[3];
313
314 vec[0].iov_base = &tag;
315 vec[0].iov_len = sizeof(tag);
316 vec[1].iov_base = &type;
317 vec[1].iov_len = sizeof(type);
318 vec[2].iov_base = (void*)payload;
319 vec[2].iov_len = len;
320
321 return write_to_log(LOG_ID_EVENTS, vec, 3);
322 }
323
324 /*
325 * Like __android_log_bwrite, but used for writing strings to the
326 * event log.
327 */
__android_log_bswrite(int32_t tag,const char * payload)328 int __android_log_bswrite(int32_t tag, const char *payload)
329 {
330 struct iovec vec[4];
331 char type = EVENT_TYPE_STRING;
332 uint32_t len = strlen(payload);
333
334 vec[0].iov_base = &tag;
335 vec[0].iov_len = sizeof(tag);
336 vec[1].iov_base = &type;
337 vec[1].iov_len = sizeof(type);
338 vec[2].iov_base = &len;
339 vec[2].iov_len = sizeof(len);
340 vec[3].iov_base = (void*)payload;
341 vec[3].iov_len = len;
342
343 return write_to_log(LOG_ID_EVENTS, vec, 4);
344 }
345