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  * Original copyright notice follows:
   7  * Copyright (C) 2005 Nguyen Anh Quynh <aquynh@gmail.com>
   8  * Copyright (C) 2005 Guillaume Thouvenin <guillaume.thouvenin@bull.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  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  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #ifndef CN_PROC_H
  26 #define CN_PROC_H
  27
  28 #include <linux/types.h>
  29 #include <linux/connector.h>
  30
  31 /*
  32  * Userspace sends this enum to register with the kernel that it is listening
  33  * for events on the connector.
  34  */
  35 enum proc_cn_mcast_op {
  36         PROC_CN_MCAST_LISTEN = 1,
  37         PROC_CN_MCAST_IGNORE = 2
  38 };
  39
  40 /*
  41  * From the user's point of view, the process
  42  * ID is the thread group ID and thread ID is the internal
  43  * kernel "pid". So, fields are assigned as follow:
  44  *
  45  *  In user space     -  In  kernel space
  46  *
  47  * parent process ID  =  parent->tgid
  48  * parent thread  ID  =  parent->pid
  49  * child  process ID  =  child->tgid
  50  * child  thread  ID  =  child->pid
  51  */
  52
  53 struct proc_event {
  54         enum what {
  55                 /* Use successive bits so the enums can be used to record
  56                  * sets of events as well
  57                  */
  58                 PROC_EVENT_NONE = 0x00000000,
  59                 PROC_EVENT_FORK = 0x00000001,
  60                 PROC_EVENT_EXEC = 0x00000002,
  61                 PROC_EVENT_UID  = 0x00000004,
  62                 PROC_EVENT_GID  = 0x00000040,
  63                 /* "next" should be 0x00000400 */
  64                 /* "last" is the last process event: exit */
  65                 PROC_EVENT_EXIT = 0x80000000
  66         } what;
  67         __u32 cpu;
  68         union { /* must be last field of proc_event struct */
  69                 struct {
  70                         __u32 err;
  71                 } ack;
  72
  73                 struct fork_proc_event {
  74                         pid_t parent_pid;
  75                         pid_t parent_tgid;
  76                         pid_t child_pid;
  77                         pid_t child_tgid;
  78                 } fork;
  79
  80                 struct exec_proc_event {
  81                         pid_t process_pid;
  82                         pid_t process_tgid;
  83                 } exec;
  84
  85                 struct id_proc_event {
  86                         pid_t process_pid;
  87                         pid_t process_tgid;
  88                         union {
  89                                 uid_t ruid; /* current->uid */
  90                                 gid_t rgid; /* current->gid */
  91                         } r;
  92                         union {
  93                                 uid_t euid;
  94                                 gid_t egid;
  95                         } e;
  96                 } id;
  97
  98                 struct exit_proc_event {
  99                         pid_t process_pid;
 100                         pid_t process_tgid;
 101                         __u32 exit_code, exit_signal;
 102                 } exit;
 103         } event_data;
 104 };
 105
 106 #ifdef __KERNEL__
 107 #ifdef CONFIG_PROC_EVENTS
 108 void proc_fork_connector(struct task_struct *task);
 109 void proc_exec_connector(struct task_struct *task);
 110 void proc_id_connector(struct task_struct *task, int which_id);
 111 void proc_exit_connector(struct task_struct *task);
 112 #else
 113 static inline void proc_fork_connector(struct task_struct *task)
 114 {}
 115
 116 static inline void proc_exec_connector(struct task_struct *task)
 117 {}
 118
 119 static inline void proc_id_connector(struct task_struct *task,
 120                                      int which_id)
 121 {}
 122
 123 static inline void proc_exit_connector(struct task_struct *task)
 124 {}
 125 #endif  /* CONFIG_PROC_EVENTS */
 126 #endif  /* __KERNEL__ */
 127 #endif  /* CN_PROC_H */