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      1 /*
      2  * Copyright (C) 2007 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 
     18 #include <stdlib.h>
     19 #include <stdio.h>
     20 #include <unistd.h>
     21 #include <string.h>
     22 #include <fcntl.h>
     23 #include <errno.h>
     24 #include <sys/socket.h>
     25 #include <cutils/logger.h>
     26 #include "sysdeps.h"
     27 #include "adb.h"
     28 
     29 #define LOG_FILE_DIR    "/dev/log/"
     30 
     31 void write_log_entry(int fd, struct logger_entry *buf);
     32 
     33 void log_service(int fd, void *cookie)
     34 {
     35     /* get the name of the log filepath to read */
     36     char * log_filepath = cookie;
     37 
     38     /* open the log file. */
     39     int logfd = unix_open(log_filepath, O_RDONLY);
     40     if (logfd < 0) {
     41         goto done;
     42     }
     43 
     44     // temp buffer to read the entries
     45     unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1] __attribute__((aligned(4)));
     46     struct logger_entry *entry = (struct logger_entry *) buf;
     47 
     48     while (1) {
     49         int ret;
     50 
     51         ret = unix_read(logfd, entry, LOGGER_ENTRY_MAX_LEN);
     52         if (ret < 0) {
     53             if (errno == EINTR || errno == EAGAIN)
     54                 continue;
     55             // perror("logcat read");
     56             goto done;
     57         }
     58         else if (!ret) {
     59             // fprintf(stderr, "read: Unexpected EOF!\n");
     60             goto done;
     61         }
     62 
     63         /* NOTE: driver guarantees we read exactly one full entry */
     64 
     65         entry->msg[entry->len] = '\0';
     66 
     67         write_log_entry(fd, entry);
     68     }
     69 
     70 done:
     71     unix_close(fd);
     72     free(log_filepath);
     73 }
     74 
     75 /* returns the full path to the log file in a newly allocated string */
     76 char * get_log_file_path(const char * log_name) {
     77     char *log_device = malloc(strlen(LOG_FILE_DIR) + strlen(log_name) + 1);
     78 
     79     strcpy(log_device, LOG_FILE_DIR);
     80     strcat(log_device, log_name);
     81 
     82     return log_device;
     83 }
     84 
     85 
     86 /* prints one log entry into the file descriptor fd */
     87 void write_log_entry(int fd, struct logger_entry *buf)
     88 {
     89     size_t size = sizeof(struct logger_entry) + buf->len;
     90 
     91     writex(fd, buf, size);
     92 }
     93