include/linux/cn_proc.h

   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  */
  27 enum 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
  45 struct 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                         __kernel_pid_t parent_pid;
  69                         __kernel_pid_t parent_tgid;
  70                         __kernel_pid_t child_pid;
  71                         __kernel_pid_t child_tgid;
  72                 } fork;
  73
  74                 struct exec_proc_event {
  75                         __kernel_pid_t process_pid;
  76                         __kernel_pid_t process_tgid;
  77                 } exec;
  78
  79                 struct id_proc_event {
  80                         __kernel_pid_t process_pid;
  81                         __kernel_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                         __kernel_pid_t process_pid;
  94                         __kernel_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
 102 void proc_fork_connector(struct task_struct *task);
 103 void proc_exec_connector(struct task_struct *task);
 104 void proc_id_connector(struct task_struct *task, int which_id);
 105 void proc_exit_connector(struct task_struct *task);
 106 #else
 107 static inline void proc_fork_connector(struct task_struct *task)
 108 {}
 109
 110 static inline void proc_exec_connector(struct task_struct *task)
 111 {}
 112
 113 static inline void proc_id_connector(struct task_struct *task,
 114                                      int which_id)
 115 {}
 116
 117 static inline void proc_exit_connector(struct task_struct *task)
 118 {}
 119 #endif  /* CONFIG_PROC_EVENTS */
 120 #endif  /* __KERNEL__ */
 121 #endif  /* CN_PROC_H */