linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * linux/ipc/msg.c

 * Copyright (C) 1992 Krishna Balasubramanian

 *

 * Removed all the remaining kerneld mess

 * Catch the -EFAULT stuff properly

 * Use GFP_KERNEL for messages as in 1.2

 * Fixed up the unchecked user space derefs

 * Copyright (C) 1998 Alan Cox & Andi Kleen

 *

 * /proc/sysvipc/msg support (c) 1999 Dragos Acostachioaie <dragos@iname.com>

 *

 * mostly rewritten, threaded and wake-one semantics added

 * MSGMAX limit removed, sysctl's added

 * (c) 1999 Manfred Spraul <manfred@colorfullife.com>

 *

 * support for audit of ipc object properties and permission changes

 * Dustin Kirkland <dustin.kirkland@us.ibm.com>

 *

 * namespaces support

 * OpenVZ, SWsoft Inc.

 * Pavel Emelianov <xemul@openvz.org>

 */

​

#include <linux/capability.h>

#include <linux/msg.h>

#include <linux/spinlock.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <linux/proc_fs.h>

#include <linux/list.h>

#include <linux/security.h>

#include <linux/sched/wake_q.h>

#include <linux/syscalls.h>

#include <linux/audit.h>

#include <linux/seq_file.h>

#include <linux/rwsem.h>

#include <linux/nsproxy.h>

#include <linux/ipc_namespace.h>

#include <linux/rhashtable.h>

​

#include <asm/current.h>

#include <linux/uaccess.h>

#include "util.h"

​

/* one msq_queue structure for each present queue on the system */

struct msg_queue {

    struct kern_ipc_perm q_perm;

    time64_t q_stime;       /* last msgsnd time */

    time64_t q_rtime;       /* last msgrcv time */

    time64_t q_ctime;       /* last change time */

    unsigned long q_cbytes;     /* current number of bytes on queue */

    unsigned long q_qnum;       /* number of messages in queue */

    unsigned long q_qbytes;     /* max number of bytes on queue */

    struct pid *q_lspid;        /* pid of last msgsnd */

    struct pid *q_lrpid;        /* last receive pid */

​

    struct list_head q_messages;

    struct list_head q_receivers;

    struct list_head q_senders;

} __randomize_layout;

​