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Diffstat (limited to 'sys/sys/shm.h')
| -rw-r--r-- | sys/sys/shm.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/sys/sys/shm.h b/sys/sys/shm.h new file mode 100644 index 0000000..d46cbbe --- /dev/null +++ b/sys/sys/shm.h @@ -0,0 +1,151 @@ +/* $OpenBSD: shm.h,v 1.29 2019/11/03 20:16:01 guenther Exp $ */ +/* $NetBSD: shm.h,v 1.20 1996/04/09 20:55:35 cgd Exp $ */ + +/* + * 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_ + +#ifndef _SYS_IPC_H_ +#include <sys/ipc.h> +#endif + +#if __BSD_VISIBLE + +/* shm-specific sysctl variables corresponding to members of struct shminfo */ +#define KERN_SHMINFO_SHMMAX 1 /* int: max shm segment size (bytes) */ +#define KERN_SHMINFO_SHMMIN 2 /* int: min shm segment size (bytes) */ +#define KERN_SHMINFO_SHMMNI 3 /* int: max number of shm identifiers */ +#define KERN_SHMINFO_SHMSEG 4 /* int: max shm segments per process */ +#define KERN_SHMINFO_SHMALL 5 /* int: max amount of shm (pages) */ +#define KERN_SHMINFO_MAXID 6 /* number of valid shared memory ids */ + +#define CTL_KERN_SHMINFO_NAMES { \ + { 0, 0 }, \ + { "shmmax", CTLTYPE_INT }, \ + { "shmmin", CTLTYPE_INT }, \ + { "shmmni", CTLTYPE_INT }, \ + { "shmseg", CTLTYPE_INT }, \ + { "shmall", CTLTYPE_INT }, \ +} + +/* + * Old (deprecated) access mode definitions--do not use. + * Provided for compatibility with old code only. + */ +#define SHM_R IPC_R +#define SHM_W IPC_W + +#endif /* __BSD_VISIBLE */ + +/* + * Shared memory operation flags for shmat(2). + */ +#define SHM_RDONLY 010000 /* Attach read-only (else read-write) */ +#define SHM_RND 020000 /* Round attach address to SHMLBA */ + +/* + * Shared memory specific control commands for shmctl(). + * We accept but ignore these (XXX). + */ +#define SHM_LOCK 3 /* Lock segment in memory. */ +#define SHM_UNLOCK 4 /* Unlock a segment locked by SHM_LOCK. */ + +/* + * Segment low boundry address multiple + */ +#define SHMLBA (1U << _MAX_PAGE_SHIFT) + +typedef short shmatt_t; + +struct shmid_ds { + struct ipc_perm shm_perm; /* operation permission structure */ + int shm_segsz; /* size of segment in bytes */ + pid_t shm_lpid; /* process ID of last shm op */ + pid_t shm_cpid; /* process ID of creator */ + shmatt_t shm_nattch; /* number of current attaches */ + time_t shm_atime; /* time of last shmat() */ + long __shm_atimensec; + time_t shm_dtime; /* time of last shmdt() */ + long __shm_dtimensec; + time_t shm_ctime; /* time of last change by shmctl() */ + long __shm_ctimensec; + void *shm_internal; /* implementation specific data */ +}; + +#if __BSD_VISIBLE +/* + * System V style catch-all structure for shared memory constants that + * might be of interest to user programs. Do we really want/need this? + */ +struct shminfo { + int shmmax; /* max shared memory segment size (bytes) */ + int shmmin; /* min shared memory segment size (bytes) */ + int shmmni; /* max number of shared memory identifiers */ + int shmseg; /* max shared memory segments per process */ + int shmall; /* max amount of shared memory (pages) */ +}; + +struct shm_sysctl_info { + struct shminfo shminfo; + struct shmid_ds shmids[1]; +}; +#endif /* __BSD_VISIBLE */ + +#ifdef _KERNEL +extern struct shminfo shminfo; +extern struct shmid_ds **shmsegs; + +struct proc; +struct vmspace; + +void shminit(void); +void shmfork(struct vmspace *, struct vmspace *); +void shmexit(struct vmspace *); +int sysctl_sysvshm(int *, u_int, void *, size_t *, void *, size_t); + +#else /* !_KERNEL */ + +__BEGIN_DECLS +void *shmat(int, const void *, int); +int shmctl(int, int, struct shmid_ds *); +int shmdt(const void *); +int shmget(key_t, size_t, int); +__END_DECLS + +#endif /* !_KERNEL */ + +#endif /* !_SYS_SHM_H_ */ |