linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * linux/ipc/util.h

 * Copyright (C) 1999 Christoph Rohland

 *

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

 * namespaces support.      2006 OpenVZ, SWsoft Inc.

 *                               Pavel Emelianov <xemul@openvz.org>

 */

​

#ifndef _IPC_UTIL_H

#define _IPC_UTIL_H

​

#include <linux/unistd.h>

#include <linux/err.h>

#include <linux/ipc_namespace.h>

​

#define IPCMNI 32768  /* <= MAX_INT limit for ipc arrays (including sysctl changes) */

#define SEQ_MULTIPLIER  (IPCMNI)

​

void sem_init(void);

void msg_init(void);

void shm_init(void);

​

struct ipc_namespace;

struct pid_namespace;

​

#ifdef CONFIG_POSIX_MQUEUE

extern void mq_clear_sbinfo(struct ipc_namespace *ns);

extern void mq_put_mnt(struct ipc_namespace *ns);

#else

static inline void mq_clear_sbinfo(struct ipc_namespace *ns) { }

static inline void mq_put_mnt(struct ipc_namespace *ns) { }

#endif

​

#ifdef CONFIG_SYSVIPC

void sem_init_ns(struct ipc_namespace *ns);

void msg_init_ns(struct ipc_namespace *ns);

void shm_init_ns(struct ipc_namespace *ns);

​

void sem_exit_ns(struct ipc_namespace *ns);

void msg_exit_ns(struct ipc_namespace *ns);

void shm_exit_ns(struct ipc_namespace *ns);

#else

static inline void sem_init_ns(struct ipc_namespace *ns) { }

static inline void msg_init_ns(struct ipc_namespace *ns) { }

static inline void shm_init_ns(struct ipc_namespace *ns) { }

​

static inline void sem_exit_ns(struct ipc_namespace *ns) { }

static inline void msg_exit_ns(struct ipc_namespace *ns) { }

static inline void shm_exit_ns(struct ipc_namespace *ns) { }

#endif

​

/*

 * Structure that holds the parameters needed by the ipc operations

 * (see after)

 */

struct ipc_params {

    key_t key;

    int flg;

    union {

        size_t size;    /* for shared memories */

        int nsems;  /* for semaphores */

    } u;            /* holds the getnew() specific param */

};

​

/*

 * Structure that holds some ipc operations. This structure is used to unify

 * the calls to sys_msgget(), sys_semget(), sys_shmget()

 *      . routine to call to create a new ipc object. Can be one of newque,

 *        newary, newseg

 *      . routine to call to check permissions for a new ipc object.

 *        Can be one of security_msg_associate, security_sem_associate,

 *        security_shm_associate

 *      . routine to call for an extra check if needed

 */

struct ipc_ops {

    int (*getnew)(struct ipc_namespace *, struct ipc_params *);

    int (*associate)(struct kern_ipc_perm *, int);

    int (*more_checks)(struct kern_ipc_perm *, struct ipc_params *);

};

​

struct seq_file;

struct ipc_ids;

​

void ipc_init_ids(struct ipc_ids *ids);

#ifdef CONFIG_PROC_FS

void __init ipc_init_proc_interface(const char *path, const char *header,

        int ids, int (*show)(struct seq_file *, void *));

struct pid_namespace *ipc_seq_pid_ns(struct seq_file *);

#else

#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)