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, struct iovec* vec, size_t nr);
31
32 static int logFds[(int)LOG_ID_MAX] = {-1, -1, -1, -1, -1, -1};
33
34 struct android_log_transport_write fakeLoggerWrite = {
35 .node = {&fakeLoggerWrite.node, &fakeLoggerWrite.node},
36 .context.priv = &logFds,
37 .name = "fake",
38 .available = NULL,
39 .open = fakeOpen,
40 .close = fakeClose,
41 .write = fakeWrite,
42 };
43
fakeOpen()44 static int fakeOpen() {
45 int i;
46
47 for (i = 0; i < LOG_ID_MAX; i++) {
48 /*
49 * Known maximum size string, plus an 8 character margin to deal with
50 * possible independent changes to android_log_id_to_name().
51 */
52 char buf[sizeof("/dev/log_security") + 8];
53 if (logFds[i] >= 0) {
54 continue;
55 }
56 snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(static_cast<log_id_t>(i)));
57 logFds[i] = fakeLogOpen(buf);
58 if (logFds[i] < 0) {
59 fprintf(stderr, "fakeLogOpen(%s) failed\n", buf);
60 }
61 }
62 return 0;
63 }
64
fakeClose()65 static void fakeClose() {
66 int i;
67
68 for (i = 0; i < LOG_ID_MAX; i++) {
69 fakeLogClose(logFds[i]);
70 logFds[i] = -1;
71 }
72 }
73
fakeWrite(log_id_t log_id,struct timespec *,struct iovec * vec,size_t nr)74 static int fakeWrite(log_id_t log_id, struct timespec*, struct iovec* vec, size_t nr) {
75 ssize_t ret;
76 size_t i;
77 int logFd, len;
78
79 if (/*(int)log_id >= 0 &&*/ (int)log_id >= (int)LOG_ID_MAX) {
80 return -EINVAL;
81 }
82
83 len = 0;
84 for (i = 0; i < nr; ++i) {
85 len += vec[i].iov_len;
86 }
87
88 if (len > LOGGER_ENTRY_MAX_PAYLOAD) {
89 len = LOGGER_ENTRY_MAX_PAYLOAD;
90 }
91
92 logFd = logFds[(int)log_id];
93 ret = TEMP_FAILURE_RETRY(fakeLogWritev(logFd, vec, nr));
94 if (ret < 0) {
95 ret = -errno;
96 } else if (ret > len) {
97 ret = len;
98 }
99
100 return ret;
101 }
102