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        !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
145        !strcmp(tag, "AT") ||
146        !strcmp(tag, "GSM") ||
147        !strcmp(tag, "STK") ||
148        !strcmp(tag, "CDMA") ||
149        !strcmp(tag, "PHONE") ||
150        !strcmp(tag, "SMS"))
151            log_id = LOG_ID_RADIO;
152
153    vec[0].iov_base   = (unsigned char *) &prio;
154    vec[0].iov_len    = 1;
155    vec[1].iov_base   = (void *) tag;
156    vec[1].iov_len    = strlen(tag) + 1;
157    vec[2].iov_base   = (void *) msg;
158    vec[2].iov_len    = strlen(msg) + 1;
159
160    return write_to_log(log_id, vec, 3);
161}
162
163int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
164{
165    struct iovec vec[3];
166
167    if (!tag)
168        tag = "";
169
170    /* XXX: This needs to go! */
171    if (!strcmp(tag, "HTC_RIL") ||
172        !strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
173        !strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" 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            bufID = LOG_ID_RADIO;
181
182    vec[0].iov_base   = (unsigned char *) &prio;
183    vec[0].iov_len    = 1;
184    vec[1].iov_base   = (void *) tag;
185    vec[1].iov_len    = strlen(tag) + 1;
186    vec[2].iov_base   = (void *) msg;
187    vec[2].iov_len    = strlen(msg) + 1;
188
189    return write_to_log(bufID, vec, 3);
190}
191
192int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap)
193{
194    char buf[LOG_BUF_SIZE];
195
196    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
197
198    return __android_log_write(prio, tag, buf);
199}
200
201int __android_log_print(int prio, const char *tag, const char *fmt, ...)
202{
203    va_list ap;
204    char buf[LOG_BUF_SIZE];
205
206    va_start(ap, fmt);
207    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
208    va_end(ap);
209
210    return __android_log_write(prio, tag, buf);
211}
212
213int __android_log_buf_print(int bufID, int prio, const char *tag, const char *fmt, ...)
214{
215    va_list ap;
216    char buf[LOG_BUF_SIZE];
217
218    va_start(ap, fmt);
219    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
220    va_end(ap);
221
222    return __android_log_buf_write(bufID, prio, tag, buf);
223}
224
225void __android_log_assert(const char *cond, const char *tag,
226			  const char *fmt, ...)
227{
228    char buf[LOG_BUF_SIZE];
229
230    if (fmt) {
231        va_list ap;
232        va_start(ap, fmt);
233        vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
234        va_end(ap);
235    } else {
236        /* Msg not provided, log condition.  N.B. Do not use cond directly as
237         * format string as it could contain spurious '%' syntax (e.g.
238         * "%d" in "blocks%devs == 0").
239         */
240        if (cond)
241            snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
242        else
243            strcpy(buf, "Unspecified assertion failed");
244    }
245
246    __android_log_write(ANDROID_LOG_FATAL, tag, buf);
247
248    __builtin_trap(); /* trap so we have a chance to debug the situation */
249}
250
251int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
252{
253    struct iovec vec[2];
254
255    vec[0].iov_base = &tag;
256    vec[0].iov_len = sizeof(tag);
257    vec[1].iov_base = (void*)payload;
258    vec[1].iov_len = len;
259
260    return write_to_log(LOG_ID_EVENTS, vec, 2);
261}
262
263/*
264 * Like __android_log_bwrite, but takes the type as well.  Doesn't work
265 * for the general case where we're generating lists of stuff, but very
266 * handy if we just want to dump an integer into the log.
267 */
268int __android_log_btwrite(int32_t tag, char type, const void *payload,
269    size_t len)
270{
271    struct iovec vec[3];
272
273    vec[0].iov_base = &tag;
274    vec[0].iov_len = sizeof(tag);
275    vec[1].iov_base = &type;
276    vec[1].iov_len = sizeof(type);
277    vec[2].iov_base = (void*)payload;
278    vec[2].iov_len = len;
279
280    return write_to_log(LOG_ID_EVENTS, vec, 3);
281}
282