ioctls/logger.c

   1 #include <inttypes.h>
   2 #include <stdlib.h>
   3
   4 /* drivers/staging/android/logger.h */
   5
   6 /* include/linux/logger.h
   7  *
   8  * Copyright (C) 2007-2008 Google, Inc.
   9  * Author: Robert Love <rlove@android.com>
  10  *
  11  * This software is licensed under the terms of the GNU General Public
  12  * License version 2, as published by the Free Software Foundation, and
  13  * may be copied, distributed, and modified under those terms.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  */
  21
  22 #include <linux/types.h>
  23 #include <linux/ioctl.h>
  24
  25 /**
  26  * struct logger_entry - defines a single entry that is given to a logger
  27  * @len:        The length of the payload
  28  * @__pad:      Two bytes of padding that appear to be required
  29  * @pid:        The generating process' process ID
  30  * @tid:        The generating process' thread ID
  31  * @sec:        The number of seconds that have elapsed since the Epoch
  32  * @nsec:       The number of nanoseconds that have elapsed since @sec
  33  * @msg:        The message that is to be logged
  34  */
  35 struct logger_entry {
  36         __u16           len;
  37         __u16           __pad;
  38         __s32           pid;
  39         __s32           tid;
  40         __s32           sec;
  41         __s32           nsec;
  42         char            msg[0];
  43 };
  44
  45 #define LOGGER_LOG_RADIO        "log_radio"     /* radio-related messages */
  46 #define LOGGER_LOG_EVENTS       "log_events"    /* system/hardware events */
  47 #define LOGGER_LOG_SYSTEM       "log_system"    /* system/framework messages */
  48 #define LOGGER_LOG_MAIN         "log_main"      /* everything else */
  49
  50 #define LOGGER_ENTRY_MAX_LEN            (4*1024)
  51 #define LOGGER_ENTRY_MAX_PAYLOAD        \
  52         (LOGGER_ENTRY_MAX_LEN - sizeof(struct logger_entry))
  53
  54 #define __LOGGERIO      0xAE
  55
  56 #define LOGGER_GET_LOG_BUF_SIZE         _IO(__LOGGERIO, 1) /* size of log */
  57 #define LOGGER_GET_LOG_LEN              _IO(__LOGGERIO, 2) /* used log len */
  58 #define LOGGER_GET_NEXT_ENTRY_LEN       _IO(__LOGGERIO, 3) /* next entry len */
  59 #define LOGGER_FLUSH_LOG                _IO(__LOGGERIO, 4) /* flush log */
  60
  61 #include "shm.h"
  62 #include "utils.h"
  63 #include "ioctls.h"
  64
  65 static const struct ioctl logger_ioctls[] = {
  66         IOCTL(LOGGER_GET_LOG_BUF_SIZE),
  67         IOCTL(LOGGER_GET_LOG_LEN),
  68         IOCTL(LOGGER_GET_NEXT_ENTRY_LEN),
  69         IOCTL(LOGGER_FLUSH_LOG),
  70 };
  71
  72 static const char *const logger_miscdevs[] = {
  73         LOGGER_LOG_RADIO,
  74         LOGGER_LOG_EVENTS,
  75         LOGGER_LOG_SYSTEM,
  76         LOGGER_LOG_MAIN,
  77 };
  78
  79 static const struct ioctl_group logger_grp = {
  80         .devtype = DEV_MISC,
  81         .devs = logger_miscdevs,
  82         .devs_cnt = ARRAY_SIZE(logger_miscdevs),
  83         .sanitise = pick_random_ioctl,
  84         .ioctls = logger_ioctls,
  85         .ioctls_cnt = ARRAY_SIZE(logger_ioctls),
  86 };
  87
  88 REG_IOCTL_GROUP(logger_grp)