xnu-792.tar.gz

[apple/xnu.git] / bsd / sys / shm_internal.h

diff --git a/bsd/sys/shm_internal.h b/bsd/sys/shm_internal.h
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+/*
+ * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*     $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 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_INTERNALH_
+#define _SYS_SHM_INTERNALH_
+
+#include <sys/shm.h>
+#include <sys/cdefs.h>
+
+#include <machine/types.h>
+
+#if __DARWIN_ALIGN_NATURAL
+#pragma options align=natural
+#endif
+
+struct user_shmid_ds {
+       struct ipc_perm shm_perm;       /* operation permission structure */
+       user_size_t     shm_segsz;      /* size of segment in bytes */
+       pid_t           shm_lpid;       /* PID of last shared memory op */
+       pid_t           shm_cpid;       /* PID of creator */
+       short           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() */
+       user_addr_t     shm_internal;   /* reserved for kernel use */
+};
+
+#if __DARWIN_ALIGN_NATURAL
+#pragma options align=reset
+#endif
+
+/*
+ * System 5 style catch-all structure for shared memory constants that
+ * might be of interest to user programs.  Also part of the ipcs interface.
+ * Note: use of user_ssize_t intentional: permits 32 bit ipcs to provide
+ * information about 64 bit programs shared segments.
+ */
+struct shminfo {
+       user_ssize_t    shmmax;         /* max shm segment size (bytes) */
+       user_ssize_t    shmmin;         /* min shm segment size (bytes) */
+       user_ssize_t    shmmni;         /* max number of shm identifiers */
+       user_ssize_t    shmseg;         /* max shm segments per process */
+       user_ssize_t    shmall;         /* max amount of shm (pages) */
+};
+
+#ifdef KERNEL
+extern struct shminfo shminfo;
+extern struct user_shmid_ds *shmsegs;
+
+struct proc;
+
+__BEGIN_DECLS
+
+void   shmexit(struct proc *);
+int    shmfork(struct proc *, struct proc *);
+__private_extern__ void        shmexec(struct proc *);
+
+__END_DECLS
+
+#endif /* kernel */
+
+#endif /* !_SYS_SHM_INTERNALH_ */