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/* $NetBSD: shm.h,v 1.55 2021/08/17 22:00:32 andvar Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1994 Adam Glass
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Adam Glass.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* As defined+described in "X/Open System Interfaces and Headers"
* Issue 4, p. XXX
*/
#ifndef _SYS_SHM_H_
#define _SYS_SHM_H_
#include <sys/cdefs.h>
#include <sys/featuretest.h>
#include <sys/ipc.h>
#define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
#define SHM_RND 020000 /* Round attach address to SHMLBA */
#ifdef _KERNEL
#define _SHM_RMLINGER 040000 /* Attach even if segment removed */
#endif
/* Segment low boundary address multiple */
#if defined(_KERNEL) || defined(_STANDALONE) || defined(_MODULE)
#define SHMLBA PAGE_SIZE
#else
/*
* SHMLBA uses libc's internal __sysconf() to retrieve the machine's
* page size. The value of _SC_PAGESIZE is 28 -- we hard code it so we do not
* need to include unistd.h
*/
__BEGIN_DECLS
long __sysconf(int);
__END_DECLS
#define SHMLBA (__sysconf(28))
#endif
typedef unsigned int shmatt_t;
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission structure */
size_t shm_segsz; /* size of segment in bytes */
pid_t shm_lpid; /* process ID of last shm operation */
pid_t shm_cpid; /* process ID of creator */
shmatt_t shm_nattch; /* number of current attaches */
time_t shm_atime; /* time of last shmat() */
time_t shm_dtime; /* time of last shmdt() */
time_t shm_ctime; /* time of last change by shmctl() */
/*
* These members are private and used only in the internal
* implementation of this interface.
*/
void *_shm_internal;
};
#if defined(_NETBSD_SOURCE)
/*
* Some systems (e.g. HP-UX) take these as the second (cmd) arg to shmctl().
*/
#define SHM_LOCK 3 /* Lock segment in memory. */
#define SHM_UNLOCK 4 /* Unlock a segment locked by SHM_LOCK. */
#endif /* _NETBSD_SOURCE */
#if defined(_NETBSD_SOURCE)
/*
* Permission definitions used in shmflag arguments to shmat(2) and shmget(2).
* Provided for source compatibility only; do not use in new code!
*/
#define SHM_R IPC_R /* S_IRUSR, R for owner */
#define SHM_W IPC_W /* S_IWUSR, W for owner */
/*
* System 5 style catch-all structure for shared memory constants that
* might be of interest to user programs. Do we really want/need this?
*/
struct shminfo {
uint64_t shmmax; /* max shared memory segment size (bytes) */
uint32_t shmmin; /* min shared memory segment size (bytes) */
uint32_t shmmni; /* max number of shared memory identifiers */
uint32_t shmseg; /* max shared memory segments per process */
uint32_t shmall; /* max amount of shared memory (pages) */
};
/* Warning: 64-bit structure padding is needed here */
struct shmid_ds_sysctl {
struct ipc_perm_sysctl shm_perm;
uint64_t shm_segsz;
pid_t shm_lpid;
pid_t shm_cpid;
time_t shm_atime;
time_t shm_dtime;
time_t shm_ctime;
uint32_t shm_nattch;
};
struct shm_sysctl_info {
struct shminfo shminfo;
struct shmid_ds_sysctl shmids[1];
};
#endif /* _NETBSD_SOURCE */
#ifdef _KERNEL
extern struct shminfo shminfo;
extern struct shmid_ds *shmsegs;
extern int shm_nused;
#define SHMSEG_FREE 0x0200
#define SHMSEG_REMOVED 0x0400
#define SHMSEG_ALLOCATED 0x0800
#define SHMSEG_WANTED 0x1000
#define SHMSEG_RMLINGER 0x2000
#define SHMSEG_WIRED 0x4000
struct vmspace;
int shminit(void);
int shmfini(void);
void shmfork(struct vmspace *, struct vmspace *);
void shmexit(struct vmspace *);
int shmctl1(struct lwp *, int, int, struct shmid_ds *);
int shm_find_segment_perm_by_index(int, struct ipc_perm *);
extern void (*uvm_shmexit)(struct vmspace *);
extern void (*uvm_shmfork)(struct vmspace *, struct vmspace *);
#define SYSCTL_FILL_SHM(src, dst) do { \
SYSCTL_FILL_PERM((src).shm_perm, (dst).shm_perm); \
(dst).shm_segsz = (src).shm_segsz; \
(dst).shm_lpid = (src).shm_lpid; \
(dst).shm_cpid = (src).shm_cpid; \
(dst).shm_atime = (src).shm_atime; \
(dst).shm_dtime = (src).shm_dtime; \
(dst).shm_ctime = (src).shm_ctime; \
(dst).shm_nattch = (src).shm_nattch; \
} while (/*CONSTCOND*/ 0)
#else /* !_KERNEL */
__BEGIN_DECLS
void *shmat(int, const void *, int);
int shmctl(int, int, struct shmid_ds *) __RENAME(__shmctl50);
int shmdt(const void *);
int shmget(key_t, size_t, int);
__END_DECLS
#endif /* !_KERNEL */
#endif /* !_SYS_SHM_H_ */
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