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
58static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
59static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
60#ifdef HAVE_PTHREADS
61static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
62#endif
63
64#ifndef __unused
65#define __unused  __attribute__((__unused__))
66#endif
67
68static 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 */
75static enum {
76    kLogUninitialized, kLogNotAvailable, kLogAvailable
77} g_log_status = kLogUninitialized;
78int __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
90static 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
96static 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
120static 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
157int __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
198int __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
233int __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
242int __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
254int __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
266void __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
292int __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 */
309int __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 */
328int __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