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, 31 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.priv = &logFds, 38 .name = "fake", 39 .available = NULL, 40 .open = fakeOpen, 41 .close = fakeClose, 42 .write = fakeWrite, 43 }; 44 45 static int fakeOpen() { 46 int i; 47 48 for (i = 0; i < LOG_ID_MAX; i++) { 49 /* 50 * Known maximum size string, plus an 8 character margin to deal with 51 * possible independent changes to android_log_id_to_name(). 52 */ 53 char buf[sizeof("/dev/log_security") + 8]; 54 if (logFds[i] >= 0) { 55 continue; 56 } 57 snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(i)); 58 logFds[i] = fakeLogOpen(buf); 59 if (logFds[i] < 0) { 60 fprintf(stderr, "fakeLogOpen(%s) failed\n", buf); 61 } 62 } 63 return 0; 64 } 65 66 static void fakeClose() { 67 int i; 68 69 for (i = 0; i < LOG_ID_MAX; i++) { 70 fakeLogClose(logFds[i]); 71 logFds[i] = -1; 72 } 73 } 74 75 static int fakeWrite(log_id_t log_id, struct timespec* ts __unused, 76 struct iovec* vec, size_t nr) { 77 ssize_t ret; 78 size_t i; 79 int logFd, len; 80 81 if (/*(int)log_id >= 0 &&*/ (int)log_id >= (int)LOG_ID_MAX) { 82 return -EINVAL; 83 } 84 85 len = 0; 86 for (i = 0; i < nr; ++i) { 87 len += vec[i].iov_len; 88 } 89 90 if (len > LOGGER_ENTRY_MAX_PAYLOAD) { 91 len = LOGGER_ENTRY_MAX_PAYLOAD; 92 } 93 94 logFd = logFds[(int)log_id]; 95 ret = TEMP_FAILURE_RETRY(fakeLogWritev(logFd, vec, nr)); 96 if (ret < 0) { 97 ret = -errno; 98 } else if (ret > len) { 99 ret = len; 100 } 101 102 return ret; 103 } 104
