/* $NetBSD: shm.h,v 1.52.4.1 2019/09/13 06:25:26 martin 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 #include #include #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 boundry 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(struct sysctllog **); 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_ */