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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 
log_service(int fd,void * cookie)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 */
get_log_file_path(const char * log_name)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 */
write_log_entry(int fd,struct logger_entry * buf)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