LXR linux/include/linux/cn

   1/*
   2 * cn_proc.h - process events connector
   3 *
   4 * Copyright (C) Matt Helsley, IBM Corp. 2005
   5 * Based on cn_fork.h by Nguyen Anh Quynh and Guillaume Thouvenin
   6 * Copyright (C) 2005 Nguyen Anh Quynh <aquynh@gmail.com>
   7 * Copyright (C) 2005 Guillaume Thouvenin <guillaume.thouvenin@bull.net>
   8 *
   9 * This program is free software; you can redistribute it and/or modify it
  10 * under the terms of version 2.1 of the GNU Lesser General Public License
  11 * as published by the Free Software Foundation.
  12 *
  13 * This program is distributed in the hope that it would be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16 */
  17
  18#ifndef CN_PROC_H
  19#define CN_PROC_H
  20
  21#include <linux/types.h>
  22
  23/*
  24 * Userspace sends this enum to register with the kernel that it is listening
  25 * for events on the connector.
  26 */
  27enum proc_cn_mcast_op {
  28        PROC_CN_MCAST_LISTEN = 1,
  29        PROC_CN_MCAST_IGNORE = 2
  30};
  31
  32/*
  33 * From the user's point of view, the process
  34 * ID is the thread group ID and thread ID is the internal
  35 * kernel "pid". So, fields are assigned as follow:
  36 *
  37 *  In user space     -  In  kernel space
  38 *
  39 * parent process ID  =  parent->tgid
  40 * parent thread  ID  =  parent->pid
  41 * child  process ID  =  child->tgid
  42 * child  thread  ID  =  child->pid
  43 */
  44
  45struct proc_event {
  46        enum what {
  47                /* Use successive bits so the enums can be used to record
  48                 * sets of events as well
  49                 */
  50                PROC_EVENT_NONE = 0x00000000,
  51                PROC_EVENT_FORK = 0x00000001,
  52                PROC_EVENT_EXEC = 0x00000002,
  53                PROC_EVENT_UID  = 0x00000004,
  54                PROC_EVENT_GID  = 0x00000040,
  55                /* "next" should be 0x00000400 */
  56                /* "last" is the last process event: exit */
  57                PROC_EVENT_EXIT = 0x80000000
  58        } what;
  59        __u32 cpu;
  60        __u64 __attribute__((aligned(8))) timestamp_ns;
  61                /* Number of nano seconds since system boot */
  62        union { /* must be last field of proc_event struct */
  63                struct {
  64                        __u32 err;
  65                } ack;
  66
  67                struct fork_proc_event {
  68                        pid_t parent_pid;
  69                        pid_t parent_tgid;
  70                        pid_t child_pid;
  71                        pid_t child_tgid;
  72                } fork;
  73
  74                struct exec_proc_event {
  75                        pid_t process_pid;
  76                        pid_t process_tgid;
  77                } exec;
  78
  79                struct id_proc_event {
  80                        pid_t process_pid;
  81                        pid_t process_tgid;
  82                        union {
  83                                __u32 ruid; /* task uid */
  84                                __u32 rgid; /* task gid */
  85                        } r;
  86                        union {
  87                                __u32 euid;
  88                                __u32 egid;
  89                        } e;
  90                } id;
  91
  92                struct exit_proc_event {
  93                        pid_t process_pid;
  94                        pid_t process_tgid;
  95                        __u32 exit_code, exit_signal;
  96                } exit;
  97        } event_data;
  98};
  99
 100#ifdef __KERNEL__
 101#ifdef CONFIG_PROC_EVENTS
 102void proc_fork_connector(struct task_struct *task);
 103void proc_exec_connector(struct task_struct *task);
 104void proc_id_connector(struct task_struct *task, int which_id);
 105void proc_exit_connector(struct task_struct *task);
 106#else
 107static inline void proc_fork_connector(struct task_struct *task)
 108{}
 109
 110static inline void proc_exec_connector(struct task_struct *task)
 111{}
 112
 113static inline void proc_id_connector(struct task_struct *task,
 114                                     int which_id)
 115{}
 116
 117static inline void proc_exit_connector(struct task_struct *task)
 118{}
 119#endif  /* CONFIG_PROC_EVENTS */
 120#endif  /* __KERNEL__ */
 121#endif  /* CN_PROC_H */
 122