logd_write.c revision 9227bd385504ace739d4451a6c5dc3d777b5bf21 
1/*
2 * Copyright (C) 2007 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#include <time.h>
17#include <stdio.h>
18#ifdef HAVE_PTHREADS
19#include <pthread.h>
20#endif
21#include <unistd.h>
22#include <errno.h>
23#include <fcntl.h>
24#include <string.h>
25#include <stdlib.h>
26#include <stdarg.h>
27#include <sys/types.h>
28#include <sys/stat.h>
29
30#include <log/logger.h>
31#include <log/logd.h>
32#include <log/log.h>
33
34#define LOG_BUF_SIZE	1024
35
36#if FAKE_LOG_DEVICE
37// This will be defined when building for the host.
38#define log_open(pathname, flags) fakeLogOpen(pathname, flags)
39#define log_writev(filedes, vector, count) fakeLogWritev(filedes, vector, count)
40#define log_close(filedes) fakeLogClose(filedes)
41#else
42#define log_open(pathname, flags) open(pathname, (flags) | O_CLOEXEC)
43#define log_writev(filedes, vector, count) writev(filedes, vector, count)
44#define log_close(filedes) close(filedes)
45#endif
46
47static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
48static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
49#ifdef HAVE_PTHREADS
50static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
51#endif
52
53static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1 };
54
55/*
56 * This is used by the C++ code to decide if it should write logs through
57 * the C code.  Basically, if /dev/log/... is available, we're running in
58 * the simulator rather than a desktop tool and want to use the device.
59 */
60static enum {
61    kLogUninitialized, kLogNotAvailable, kLogAvailable
62} g_log_status = kLogUninitialized;
63int __android_log_dev_available(void)
64{
65    if (g_log_status == kLogUninitialized) {
66        if (access("/dev/"LOGGER_LOG_MAIN, W_OK) == 0)
67            g_log_status = kLogAvailable;
68        else
69            g_log_status = kLogNotAvailable;
70    }
71
72    return (g_log_status == kLogAvailable);
73}
74
75static int __write_to_log_null(log_id_t log_fd, struct iovec *vec, size_t nr)
76{
77    return -1;
78}
79
80static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
81{
82    ssize_t ret;
83    int log_fd;
84
85    if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) {
86        log_fd = log_fds[(int)log_id];
87    } else {
88        return EBADF;
89    }
90
91    do {
92        ret = log_writev(log_fd, vec, nr);
93    } while (ret < 0 && errno == EINTR);
94
95    return ret;
96}
97
98static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
99{
100#ifdef HAVE_PTHREADS
101    pthread_mutex_lock(&log_init_lock);
102#endif
103
104    if (write_to_log == __write_to_log_init) {
105        log_fds[LOG_ID_MAIN] = log_open("/dev/"LOGGER_LOG_MAIN, O_WRONLY);
106        log_fds[LOG_ID_RADIO] = log_open("/dev/"LOGGER_LOG_RADIO, O_WRONLY);
107        log_fds[LOG_ID_EVENTS] = log_open("/dev/"LOGGER_LOG_EVENTS, O_WRONLY);
108        log_fds[LOG_ID_SYSTEM] = log_open("/dev/"LOGGER_LOG_SYSTEM, O_WRONLY);
109
110        write_to_log = __write_to_log_kernel;
111
112        if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0 ||
113                log_fds[LOG_ID_EVENTS] < 0) {
114            log_close(log_fds[LOG_ID_MAIN]);
115            log_close(log_fds[LOG_ID_RADIO]);
116            log_close(log_fds[LOG_ID_EVENTS]);
117            log_fds[LOG_ID_MAIN] = -1;
118            log_fds[LOG_ID_RADIO] = -1;
119            log_fds[LOG_ID_EVENTS] = -1;
120            write_to_log = __write_to_log_null;
121        }
122
123        if (log_fds[LOG_ID_SYSTEM] < 0) {
124            log_fds[LOG_ID_SYSTEM] = log_fds[LOG_ID_MAIN];
125        }
126    }
127
128#ifdef HAVE_PTHREADS
129    pthread_mutex_unlock(&log_init_lock);
130#endif
131
132    return write_to_log(log_id, vec, nr);
133}
134
135int __android_log_write(int prio, const char *tag, const char *msg)
136{
137    struct iovec vec[3];
138    log_id_t log_id = LOG_ID_MAIN;
139    char tmp_tag[32];
140
141    if (!tag)
142        tag = "";
143
144    /* XXX: This needs to go! */
145    if (!strcmp(tag, "HTC_RIL") ||
146        !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
147        !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
148        !strcmp(tag, "AT") ||
149        !strcmp(tag, "GSM") ||
150        !strcmp(tag, "STK") ||
151        !strcmp(tag, "CDMA") ||
152        !strcmp(tag, "PHONE") ||
153        !strcmp(tag, "SMS")) {
154            log_id = LOG_ID_RADIO;
155            // Inform third party apps/ril/radio.. to use Rlog or RLOG
156            snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
157            tag = tmp_tag;
158    }
159
160    vec[0].iov_base   = (unsigned char *) &prio;
161    vec[0].iov_len    = 1;
162    vec[1].iov_base   = (void *) tag;
163    vec[1].iov_len    = strlen(tag) + 1;
164    vec[2].iov_base   = (void *) msg;
165    vec[2].iov_len    = strlen(msg) + 1;
166
167    return write_to_log(log_id, vec, 3);
168}
169
170int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
171{
172    struct iovec vec[3];
173    char tmp_tag[32];
174
175    if (!tag)
176        tag = "";
177
178    /* XXX: This needs to go! */
179    if ((bufID != LOG_ID_RADIO) &&
180         (!strcmp(tag, "HTC_RIL") ||
181        !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
182        !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
183        !strcmp(tag, "AT") ||
184        !strcmp(tag, "GSM") ||
185        !strcmp(tag, "STK") ||
186        !strcmp(tag, "CDMA") ||
187        !strcmp(tag, "PHONE") ||
188        !strcmp(tag, "SMS"))) {
189            bufID = LOG_ID_RADIO;
190            // Inform third party apps/ril/radio.. to use Rlog or RLOG
191            snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
192            tag = tmp_tag;
193    }
194
195    vec[0].iov_base   = (unsigned char *) &prio;
196    vec[0].iov_len    = 1;
197    vec[1].iov_base   = (void *) tag;
198    vec[1].iov_len    = strlen(tag) + 1;
199    vec[2].iov_base   = (void *) msg;
200    vec[2].iov_len    = strlen(msg) + 1;
201
202    return write_to_log(bufID, vec, 3);
203}
204
205int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap)
206{
207    char buf[LOG_BUF_SIZE];
208
209    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
210
211    return __android_log_write(prio, tag, buf);
212}
213
214int __android_log_print(int prio, const char *tag, const char *fmt, ...)
215{
216    va_list ap;
217    char buf[LOG_BUF_SIZE];
218
219    va_start(ap, fmt);
220    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
221    va_end(ap);
222
223    return __android_log_write(prio, tag, buf);
224}
225
226int __android_log_buf_print(int bufID, int prio, const char *tag, const char *fmt, ...)
227{
228    va_list ap;
229    char buf[LOG_BUF_SIZE];
230
231    va_start(ap, fmt);
232    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
233    va_end(ap);
234
235    return __android_log_buf_write(bufID, prio, tag, buf);
236}
237
238void __android_log_assert(const char *cond, const char *tag,
239			  const char *fmt, ...)
240{
241    char buf[LOG_BUF_SIZE];
242
243    if (fmt) {
244        va_list ap;
245        va_start(ap, fmt);
246        vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
247        va_end(ap);
248    } else {
249        /* Msg not provided, log condition.  N.B. Do not use cond directly as
250         * format string as it could contain spurious '%' syntax (e.g.
251         * "%d" in "blocks%devs == 0").
252         */
253        if (cond)
254            snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
255        else
256            strcpy(buf, "Unspecified assertion failed");
257    }
258
259    __android_log_write(ANDROID_LOG_FATAL, tag, buf);
260
261    __builtin_trap(); /* trap so we have a chance to debug the situation */
262}
263
264int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
265{
266    struct iovec vec[2];
267
268    vec[0].iov_base = &tag;
269    vec[0].iov_len = sizeof(tag);
270    vec[1].iov_base = (void*)payload;
271    vec[1].iov_len = len;
272
273    return write_to_log(LOG_ID_EVENTS, vec, 2);
274}
275
276/*
277 * Like __android_log_bwrite, but takes the type as well.  Doesn't work
278 * for the general case where we're generating lists of stuff, but very
279 * handy if we just want to dump an integer into the log.
280 */
281int __android_log_btwrite(int32_t tag, char type, const void *payload,
282    size_t len)
283{
284    struct iovec vec[3];
285
286    vec[0].iov_base = &tag;
287    vec[0].iov_len = sizeof(tag);
288    vec[1].iov_base = &type;
289    vec[1].iov_len = sizeof(type);
290    vec[2].iov_base = (void*)payload;
291    vec[2].iov_len = len;
292
293    return write_to_log(LOG_ID_EVENTS, vec, 3);
294}
295