logger.h revision 6756a0c9fe930cc5ccebf5313f605df0d127a2db 
1/* utils/logger.h
2**
3** Copyright 2007, The Android Open Source Project
4**
5** This file is dual licensed.  It may be redistributed and/or modified
6** under the terms of the Apache 2.0 License OR version 2 of the GNU
7** General Public License.
8*/
9
10#ifndef _UTILS_LOGGER_H
11#define _UTILS_LOGGER_H
12
13#include <stdint.h>
14
15/*
16 * The userspace structure for version 1 of the logger_entry ABI.
17 * This structure is returned to userspace by the kernel logger
18 * driver unless an upgrade to a newer ABI version is requested.
19 */
20struct logger_entry {
21    uint16_t    len;    /* length of the payload */
22    uint16_t    __pad;  /* no matter what, we get 2 bytes of padding */
23    int32_t     pid;    /* generating process's pid */
24    int32_t     tid;    /* generating process's tid */
25    int32_t     sec;    /* seconds since Epoch */
26    int32_t     nsec;   /* nanoseconds */
27    char        msg[0]; /* the entry's payload */
28};
29
30/*
31 * The userspace structure for version 2 of the logger_entry ABI.
32 * This structure is returned to userspace if ioctl(LOGGER_SET_VERSION)
33 * is called with version==2
34 */
35struct logger_entry_v2 {
36    uint16_t    len;       /* length of the payload */
37    uint16_t    hdr_size;  /* sizeof(struct logger_entry_v2) */
38    int32_t     pid;       /* generating process's pid */
39    int32_t     tid;       /* generating process's tid */
40    int32_t     sec;       /* seconds since Epoch */
41    int32_t     nsec;      /* nanoseconds */
42    uint32_t    euid;      /* effective UID of logger */
43    char        msg[0];    /* the entry's payload */
44};
45
46#define LOGGER_LOG_MAIN		"log/main"
47#define LOGGER_LOG_RADIO	"log/radio"
48#define LOGGER_LOG_EVENTS	"log/events"
49#define LOGGER_LOG_SYSTEM	"log/system"
50
51/*
52 * The maximum size of the log entry payload that can be
53 * written to the kernel logger driver. An attempt to write
54 * more than this amount to /dev/log/* will result in a
55 * truncated log entry.
56 */
57#define LOGGER_ENTRY_MAX_PAYLOAD	4076
58
59/*
60 * The maximum size of a log entry which can be read from the
61 * kernel logger driver. An attempt to read less than this amount
62 * may result in read() returning EINVAL.
63 */
64#define LOGGER_ENTRY_MAX_LEN		(5*1024)
65
66#ifdef HAVE_IOCTL
67
68#include <sys/ioctl.h>
69
70#define __LOGGERIO	0xAE
71
72#define LOGGER_GET_LOG_BUF_SIZE		_IO(__LOGGERIO, 1) /* size of log */
73#define LOGGER_GET_LOG_LEN		_IO(__LOGGERIO, 2) /* used log len */
74#define LOGGER_GET_NEXT_ENTRY_LEN	_IO(__LOGGERIO, 3) /* next entry len */
75#define LOGGER_FLUSH_LOG		_IO(__LOGGERIO, 4) /* flush log */
76#define LOGGER_GET_VERSION		_IO(__LOGGERIO, 5) /* abi version */
77#define LOGGER_SET_VERSION		_IO(__LOGGERIO, 6) /* abi version */
78
79#endif // HAVE_IOCTL
80
81#endif /* _UTILS_LOGGER_H */
82