1 /*
2  * Copyright (C) 2007-2016 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 #include <unistd.h>
20 
21 #include <log/log.h>
22 
23 #include "config_write.h"
24 #include "fake_log_device.h"
25 #include "log_portability.h"
26 #include "logger.h"
27 
28 static int fakeOpen();
29 static void fakeClose();
30 static int fakeWrite(log_id_t log_id, struct timespec *ts,
31                      struct iovec *vec, size_t nr);
32 
33 static int logFds[(int)LOG_ID_MAX] = { -1, -1, -1, -1, -1, -1 };
34 
35 LIBLOG_HIDDEN struct android_log_transport_write fakeLoggerWrite = {
36     .node = { &fakeLoggerWrite.node, &fakeLoggerWrite.node },
37     .context.private = &logFds,
38     .name = "fake",
39     .available = NULL,
40     .open = fakeOpen,
41     .close = fakeClose,
42     .write = fakeWrite,
43 };
44 
fakeOpen()45 static int fakeOpen() {
46     int i;
47 
48     for (i = 0; i < LOG_ID_MAX; i++) {
49         char buf[sizeof("/dev/log_security")];
50         snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(i));
51         logFds[i] = fakeLogOpen(buf, O_WRONLY);
52     }
53     return 0;
54 }
55 
fakeClose()56 static void fakeClose() {
57     int i;
58 
59     for (i = 0; i < LOG_ID_MAX; i++) {
60         fakeLogClose(logFds[i]);
61         logFds[i] = -1;
62     }
63 }
64 
fakeWrite(log_id_t log_id,struct timespec * ts __unused,struct iovec * vec,size_t nr)65 static int fakeWrite(log_id_t log_id, struct timespec *ts __unused,
66                       struct iovec *vec, size_t nr)
67 {
68     ssize_t ret;
69     int logFd;
70 
71     if (/*(int)log_id >= 0 &&*/ (int)log_id >= (int)LOG_ID_MAX) {
72         return -EBADF;
73     }
74 
75     logFd = logFds[(int)log_id];
76     ret = TEMP_FAILURE_RETRY(fakeLogWritev(logFd, vec, nr));
77     if (ret < 0) {
78         ret = -errno;
79     }
80 
81     return ret;
82 }
83