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02b51df1b0
The act of a process becoming a session leader is a useful signal to a supervising init daemon such as Upstart. While a daemon will normally do this as part of the process of becoming a daemon, it is rare for its children to do so. When the children do, it is nearly always a sign that the child should be considered detached from the parent and not supervised along with it. The poster-child example is OpenSSH; the per-login children call setsid() so that they may control the pty connected to them. If the primary daemon dies or is restarted, we do not want to consider the per-login children and want to respawn the primary daemon without killing the children. This patch adds a new PROC_SID_EVENT and associated structure to the proc_event event_data union, it arranges for this to be emitted when the special PIDTYPE_SID pid is set. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Scott James Remnant <scott@ubuntu.com> Acked-by: Matt Helsley <matthltc@us.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Acked-by: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* cn_proc.h - process events connector
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*
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* Copyright (C) Matt Helsley, IBM Corp. 2005
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* Based on cn_fork.h by Nguyen Anh Quynh and Guillaume Thouvenin
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* Copyright (C) 2005 Nguyen Anh Quynh <aquynh@gmail.com>
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* Copyright (C) 2005 Guillaume Thouvenin <guillaume.thouvenin@bull.net>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef CN_PROC_H
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#define CN_PROC_H
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#include <linux/types.h>
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/*
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* Userspace sends this enum to register with the kernel that it is listening
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* for events on the connector.
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*/
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enum proc_cn_mcast_op {
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PROC_CN_MCAST_LISTEN = 1,
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PROC_CN_MCAST_IGNORE = 2
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};
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/*
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* From the user's point of view, the process
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* ID is the thread group ID and thread ID is the internal
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* kernel "pid". So, fields are assigned as follow:
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*
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* In user space - In kernel space
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*
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* parent process ID = parent->tgid
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* parent thread ID = parent->pid
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* child process ID = child->tgid
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* child thread ID = child->pid
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*/
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struct proc_event {
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enum what {
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/* Use successive bits so the enums can be used to record
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* sets of events as well
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*/
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PROC_EVENT_NONE = 0x00000000,
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PROC_EVENT_FORK = 0x00000001,
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PROC_EVENT_EXEC = 0x00000002,
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PROC_EVENT_UID = 0x00000004,
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PROC_EVENT_GID = 0x00000040,
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PROC_EVENT_SID = 0x00000080,
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/* "next" should be 0x00000400 */
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/* "last" is the last process event: exit */
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PROC_EVENT_EXIT = 0x80000000
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} what;
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__u32 cpu;
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__u64 __attribute__((aligned(8))) timestamp_ns;
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/* Number of nano seconds since system boot */
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union { /* must be last field of proc_event struct */
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struct {
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__u32 err;
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} ack;
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struct fork_proc_event {
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__kernel_pid_t parent_pid;
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__kernel_pid_t parent_tgid;
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__kernel_pid_t child_pid;
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__kernel_pid_t child_tgid;
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} fork;
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struct exec_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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} exec;
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struct id_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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union {
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__u32 ruid; /* task uid */
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__u32 rgid; /* task gid */
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} r;
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union {
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__u32 euid;
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__u32 egid;
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} e;
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} id;
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struct sid_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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} sid;
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struct exit_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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__u32 exit_code, exit_signal;
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} exit;
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} event_data;
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};
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#ifdef __KERNEL__
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#ifdef CONFIG_PROC_EVENTS
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void proc_fork_connector(struct task_struct *task);
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void proc_exec_connector(struct task_struct *task);
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void proc_id_connector(struct task_struct *task, int which_id);
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void proc_sid_connector(struct task_struct *task);
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void proc_exit_connector(struct task_struct *task);
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#else
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static inline void proc_fork_connector(struct task_struct *task)
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{}
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static inline void proc_exec_connector(struct task_struct *task)
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{}
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static inline void proc_id_connector(struct task_struct *task,
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int which_id)
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{}
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static inline void proc_sid_connector(struct task_struct *task)
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{}
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static inline void proc_exit_connector(struct task_struct *task)
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{}
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#endif /* CONFIG_PROC_EVENTS */
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#endif /* __KERNEL__ */
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#endif /* CN_PROC_H */
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