1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 #include <time.h> 29 #include <stdio.h> 30 #include <pthread.h> 31 #include <unistd.h> 32 #include <sys/types.h> 33 #include <sys/uio.h> 34 #include <arpa/inet.h> 35 #include <errno.h> 36 #include <string.h> 37 #include <stdlib.h> 38 #include <stdarg.h> 39 #include <fcntl.h> 40 41 #include "logd.h" 42 43 /* should match system/core/include/cutils/logger.h */ 44 #define LOGGER_LOG_MAIN "log/main" 45 #define LOGGER_LOG_RADIO "log/radio" 46 #define LOGGER_LOG_EVENTS "log/events" 47 #define LOGGER_LOG_SYSTEM "log/system" 48 49 #include <pthread.h> 50 51 #define LOG_BUF_SIZE 1024 52 53 typedef enum { 54 LOG_ID_NONE = 0, 55 LOG_ID_MAIN, 56 LOG_ID_RADIO, 57 LOG_ID_MAX 58 } log_id_t; 59 60 /* logger handles writing to object, pointed by log channel id */ 61 typedef int (*logger_function_t)(log_id_t log_id, struct iovec *vec); 62 63 typedef struct { 64 logger_function_t logger; 65 int fd; 66 const char *path; 67 } log_channel_t; 68 69 static int __write_to_log_init(log_id_t log_id, struct iovec *vec); 70 static int __write_to_log_null(log_id_t log_id, struct iovec *vec); 71 72 static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER; 73 74 static log_channel_t log_channels[LOG_ID_MAX] = { 75 { __write_to_log_null, -1, NULL }, 76 { __write_to_log_init, -1, "/dev/"LOGGER_LOG_MAIN }, 77 { __write_to_log_init, -1, "/dev/"LOGGER_LOG_RADIO } 78 }; 79 80 static int __write_to_log_null(log_id_t log_id, struct iovec *vec) 81 { 82 /* 83 * ALTERED behaviour from previous version 84 * always returns successful result 85 */ 86 int i = 0; 87 size_t res = 0; 88 89 for ( ; i < 3; ++i) { 90 res += vec[i].iov_len; 91 } 92 93 return (int)res; 94 } 95 96 /* 97 * it's supposed, that log_id contains valid id always. 98 * this check must be performed in higher level functions 99 */ 100 static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec) 101 { 102 ssize_t ret; 103 104 do { 105 ret = writev(log_channels[log_id].fd, vec, 3); 106 } while ((ret < 0) && (errno == EINTR)); 107 108 return ret; 109 } 110 111 static int __write_to_log_init(log_id_t log_id, struct iovec *vec) 112 { 113 if ((LOG_ID_NONE < log_id) && (log_id < LOG_ID_MAX)) { 114 pthread_mutex_lock(&log_init_lock); 115 116 int fd = open(log_channels[log_id].path, O_WRONLY); 117 118 log_channels[log_id].logger = 119 (fd < 0) ? __write_to_log_null : __write_to_log_kernel; 120 log_channels[log_id].fd = fd; 121 122 log_channels[log_id].fd = fd; 123 124 pthread_mutex_unlock(&log_init_lock); 125 126 return log_channels[log_id].logger(log_id, vec); 127 } 128 129 /* log_id is invalid */ 130 return -1; 131 } 132 133 static int __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 == NULL) 139 tag = ""; 140 141 if (!strcmp(tag, "HTC_RIL")) 142 log_id = LOG_ID_RADIO; 143 144 vec[0].iov_base = (unsigned char *) &prio; 145 vec[0].iov_len = 1; 146 vec[1].iov_base = (void *) tag; 147 vec[1].iov_len = strlen(tag) + 1; 148 vec[2].iov_base = (void *) msg; 149 vec[2].iov_len = strlen(msg) + 1; 150 151 return log_channels[log_id].logger(log_id, vec); 152 } 153 154 155 int __libc_android_log_vprint(int prio, const char *tag, const char *fmt, 156 va_list ap) 157 { 158 char buf[LOG_BUF_SIZE]; 159 160 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap); 161 162 return __android_log_write(prio, tag, buf); 163 } 164 165 int __libc_android_log_print(int prio, const char *tag, const char *fmt, ...) 166 { 167 va_list ap; 168 char buf[LOG_BUF_SIZE]; 169 170 va_start(ap, fmt); 171 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap); 172 va_end(ap); 173 174 return __android_log_write(prio, tag, buf); 175 } 176 177 int __libc_android_log_assert(const char *cond, const char *tag, 178 const char *fmt, ...) 179 { 180 va_list ap; 181 char buf[LOG_BUF_SIZE]; 182 183 va_start(ap, fmt); 184 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap); 185 va_end(ap); 186 187 __android_log_write(ANDROID_LOG_FATAL, tag, buf); 188 189 exit(1); 190 191 return -1; 192 } 193
