logd_write.c revision 44e95651dd1e07017ab85d05a542d2372dbb2baa 
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
28#include <cutils/logger.h>
29#include <cutils/logd.h>
30#include <cutils/log.h>
31
32#define LOG_BUF_SIZE	1024
33
34#if FAKE_LOG_DEVICE
35// This will be defined when building for the host.
36#define log_open(pathname, flags) fakeLogOpen(pathname, flags)
37#define log_writev(filedes, vector, count) fakeLogWritev(filedes, vector, count)
38#define log_close(filedes) fakeLogClose(filedes)
39#else
40#define log_open(pathname, flags) open(pathname, flags)
41#define log_writev(filedes, vector, count) writev(filedes, vector, count)
42#define log_close(filedes) close(filedes)
43#endif
44
45static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
46static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
47#ifdef HAVE_PTHREADS
48static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
49#endif
50
51static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1 };
52
53/*
54 * This is used by the C++ code to decide if it should write logs through
55 * the C code.  Basically, if /dev/log/... is available, we're running in
56 * the simulator rather than a desktop tool and want to use the device.
57 */
58static enum {
59    kLogUninitialized, kLogNotAvailable, kLogAvailable
60} g_log_status = kLogUninitialized;
61int __android_log_dev_available(void)
62{
63    if (g_log_status == kLogUninitialized) {
64        if (access("/dev/"LOGGER_LOG_MAIN, W_OK) == 0)
65            g_log_status = kLogAvailable;
66        else
67            g_log_status = kLogNotAvailable;
68    }
69
70    return (g_log_status == kLogAvailable);
71}
72
73static int __write_to_log_null(log_id_t log_fd, struct iovec *vec, size_t nr)
74{
75    return -1;
76}
77
78static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
79{
80    ssize_t ret;
81    int log_fd;
82
83    if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) {
84        log_fd = log_fds[(int)log_id];
85    } else {
86        return EBADF;
87    }
88
89    do {
90        ret = log_writev(log_fd, vec, nr);
91    } while (ret < 0 && errno == EINTR);
92
93    return ret;
94}
95
96static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
97{
98#ifdef HAVE_PTHREADS
99    pthread_mutex_lock(&log_init_lock);
100#endif
101
102    if (write_to_log == __write_to_log_init) {
103        log_fds[LOG_ID_MAIN] = log_open("/dev/"LOGGER_LOG_MAIN, O_WRONLY);
104        log_fds[LOG_ID_RADIO] = log_open("/dev/"LOGGER_LOG_RADIO, O_WRONLY);
105        log_fds[LOG_ID_EVENTS] = log_open("/dev/"LOGGER_LOG_EVENTS, O_WRONLY);
106        log_fds[LOG_ID_SYSTEM] = log_open("/dev/"LOGGER_LOG_SYSTEM, O_WRONLY);
107
108        write_to_log = __write_to_log_kernel;
109
110        if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0 ||
111                log_fds[LOG_ID_EVENTS] < 0) {
112            log_close(log_fds[LOG_ID_MAIN]);
113            log_close(log_fds[LOG_ID_RADIO]);
114            log_close(log_fds[LOG_ID_EVENTS]);
115            log_fds[LOG_ID_MAIN] = -1;
116            log_fds[LOG_ID_RADIO] = -1;
117            log_fds[LOG_ID_EVENTS] = -1;
118            write_to_log = __write_to_log_null;
119        }
120
121        if (log_fds[LOG_ID_SYSTEM] < 0) {
122            log_fds[LOG_ID_SYSTEM] = log_fds[LOG_ID_MAIN];
123        }
124    }
125
126#ifdef HAVE_PTHREADS
127    pthread_mutex_unlock(&log_init_lock);
128#endif
129
130    return write_to_log(log_id, vec, nr);
131}
132
133int __android_log_write(int prio, const char *tag, const char *msg)
134{
135    struct iovec vec[3];
136    log_id_t log_id = LOG_ID_MAIN;
137
138    if (!tag)
139        tag = "";
140
141    /* XXX: This needs to go! */
142    if (!strcmp(tag, "HTC_RIL") ||
143        !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
144        !strcmp(tag, "AT") ||
145        !strcmp(tag, "GSM") ||
146        !strcmp(tag, "STK") ||
147        !strcmp(tag, "CDMA") ||
148        !strcmp(tag, "PHONE") ||
149        !strcmp(tag, "SMS") ||
150        !strcmp(tag, "IMS") ||
151        !strcmp(tag, "IMSFW"))
152            log_id = LOG_ID_RADIO;
153
154    vec[0].iov_base   = (unsigned char *) &prio;
155    vec[0].iov_len    = 1;
156    vec[1].iov_base   = (void *) tag;
157    vec[1].iov_len    = strlen(tag) + 1;
158    vec[2].iov_base   = (void *) msg;
159    vec[2].iov_len    = strlen(msg) + 1;
160
161    return write_to_log(log_id, vec, 3);
162}
163
164int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
165{
166    struct iovec vec[3];
167
168    if (!tag)
169        tag = "";
170
171    /* XXX: This needs to go! */
172    if (!strcmp(tag, "HTC_RIL") ||
173        !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
174        !strcmp(tag, "AT") ||
175        !strcmp(tag, "GSM") ||
176        !strcmp(tag, "STK") ||
177        !strcmp(tag, "CDMA") ||
178        !strcmp(tag, "PHONE") ||
179        !strcmp(tag, "SMS") ||
180        !strcmp(tag, "IMS") ||
181        !strcmp(tag, "IMSFW"))
182            bufID = LOG_ID_RADIO;
183
184    vec[0].iov_base   = (unsigned char *) &prio;
185    vec[0].iov_len    = 1;
186    vec[1].iov_base   = (void *) tag;
187    vec[1].iov_len    = strlen(tag) + 1;
188    vec[2].iov_base   = (void *) msg;
189    vec[2].iov_len    = strlen(msg) + 1;
190
191    return write_to_log(bufID, vec, 3);
192}
193
194int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap)
195{
196    char buf[LOG_BUF_SIZE];
197
198    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
199
200    return __android_log_write(prio, tag, buf);
201}
202
203int __android_log_print(int prio, const char *tag, const char *fmt, ...)
204{
205    va_list ap;
206    char buf[LOG_BUF_SIZE];
207
208    va_start(ap, fmt);
209    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
210    va_end(ap);
211
212    return __android_log_write(prio, tag, buf);
213}
214
215int __android_log_buf_print(int bufID, int prio, const char *tag, const char *fmt, ...)
216{
217    va_list ap;
218    char buf[LOG_BUF_SIZE];
219
220    va_start(ap, fmt);
221    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
222    va_end(ap);
223
224    return __android_log_buf_write(bufID, prio, tag, buf);
225}
226
227void __android_log_assert(const char *cond, const char *tag,
228			  const char *fmt, ...)
229{
230    char buf[LOG_BUF_SIZE];
231
232    if (fmt) {
233        va_list ap;
234        va_start(ap, fmt);
235        vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
236        va_end(ap);
237    } else {
238        /* Msg not provided, log condition.  N.B. Do not use cond directly as
239         * format string as it could contain spurious '%' syntax (e.g.
240         * "%d" in "blocks%devs == 0").
241         */
242        if (cond)
243            snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
244        else
245            strcpy(buf, "Unspecified assertion failed");
246    }
247
248    __android_log_write(ANDROID_LOG_FATAL, tag, buf);
249
250    __builtin_trap(); /* trap so we have a chance to debug the situation */
251}
252
253int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
254{
255    struct iovec vec[2];
256
257    vec[0].iov_base = &tag;
258    vec[0].iov_len = sizeof(tag);
259    vec[1].iov_base = (void*)payload;
260    vec[1].iov_len = len;
261
262    return write_to_log(LOG_ID_EVENTS, vec, 2);
263}
264
265/*
266 * Like __android_log_bwrite, but takes the type as well.  Doesn't work
267 * for the general case where we're generating lists of stuff, but very
268 * handy if we just want to dump an integer into the log.
269 */
270int __android_log_btwrite(int32_t tag, char type, const void *payload,
271    size_t len)
272{
273    struct iovec vec[3];
274
275    vec[0].iov_base = &tag;
276    vec[0].iov_len = sizeof(tag);
277    vec[1].iov_base = &type;
278    vec[1].iov_len = sizeof(type);
279    vec[2].iov_base = (void*)payload;
280    vec[2].iov_len = len;
281
282    return write_to_log(LOG_ID_EVENTS, vec, 3);
283}
284