linux/include/linux/cn_proc.h
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   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                PROC_EVENT_SID  = 0x00000080,
  56                PROC_EVENT_PTRACE = 0x00000100,
  57                PROC_EVENT_COMM = 0x00000200,
  58                /* "next" should be 0x00000400 */
  59                /* "last" is the last process event: exit */
  60                PROC_EVENT_EXIT = 0x80000000
  61        } what;
  62        __u32 cpu;
  63        __u64 __attribute__((aligned(8))) timestamp_ns;
  64                /* Number of nano seconds since system boot */
  65        union { /* must be last field of proc_event struct */
  66                struct {
  67                        __u32 err;
  68                } ack;
  69
  70                struct fork_proc_event {
  71                        __kernel_pid_t parent_pid;
  72                        __kernel_pid_t parent_tgid;
  73                        __kernel_pid_t child_pid;
  74                        __kernel_pid_t child_tgid;
  75                } fork;
  76
  77                struct exec_proc_event {
  78                        __kernel_pid_t process_pid;
  79                        __kernel_pid_t process_tgid;
  80                } exec;
  81
  82                struct id_proc_event {
  83                        __kernel_pid_t process_pid;
  84                        __kernel_pid_t process_tgid;
  85                        union {
  86                                __u32 ruid; /* task uid */
  87                                __u32 rgid; /* task gid */
  88                        } r;
  89                        union {
  90                                __u32 euid;
  91                                __u32 egid;
  92                        } e;
  93                } id;
  94
  95                struct sid_proc_event {
  96                        __kernel_pid_t process_pid;
  97                        __kernel_pid_t process_tgid;
  98                } sid;
  99
 100                struct ptrace_proc_event {
 101                        __kernel_pid_t process_pid;
 102                        __kernel_pid_t process_tgid;
 103                        __kernel_pid_t tracer_pid;
 104                        __kernel_pid_t tracer_tgid;
 105                } ptrace;
 106
 107                struct comm_proc_event {
 108                        __kernel_pid_t process_pid;
 109                        __kernel_pid_t process_tgid;
 110                        char           comm[16];
 111                } comm;
 112
 113                struct exit_proc_event {
 114                        __kernel_pid_t process_pid;
 115                        __kernel_pid_t process_tgid;
 116                        __u32 exit_code, exit_signal;
 117                } exit;
 118        } event_data;
 119};
 120
 121#ifdef __KERNEL__
 122#ifdef CONFIG_PROC_EVENTS
 123void proc_fork_connector(struct task_struct *task);
 124void proc_exec_connector(struct task_struct *task);
 125void proc_id_connector(struct task_struct *task, int which_id);
 126void proc_sid_connector(struct task_struct *task);
 127void proc_ptrace_connector(struct task_struct *task, int which_id);
 128void proc_comm_connector(struct task_struct *task);
 129void proc_exit_connector(struct task_struct *task);
 130#else
 131static inline void proc_fork_connector(struct task_struct *task)
 132{}
 133
 134static inline void proc_exec_connector(struct task_struct *task)
 135{}
 136
 137static inline void proc_id_connector(struct task_struct *task,
 138                                     int which_id)
 139{}
 140
 141static inline void proc_sid_connector(struct task_struct *task)
 142{}
 143
 144static inline void proc_comm_connector(struct task_struct *task)
 145{}
 146
 147static inline void proc_ptrace_connector(struct task_struct *task,
 148                                         int ptrace_id)
 149{}
 150
 151static inline void proc_exit_connector(struct task_struct *task)
 152{}
 153#endif  /* CONFIG_PROC_EVENTS */
 154#endif  /* __KERNEL__ */
 155#endif  /* CN_PROC_H */
 156
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