Annotation of sys/sys/shm.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: shm.h,v 1.21 2007/05/29 10:44:28 sturm Exp $ */
! 2: /* $NetBSD: shm.h,v 1.20 1996/04/09 20:55:35 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1994 Adam Glass
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Adam Glass.
! 19: * 4. The name of the author may not be used to endorse or promote products
! 20: * derived from this software without specific prior written permission
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 32: */
! 33:
! 34: /*
! 35: * As defined+described in "X/Open System Interfaces and Headers"
! 36: * Issue 4, p. XXX
! 37: */
! 38:
! 39: #ifndef _SYS_SHM_H_
! 40: #define _SYS_SHM_H_
! 41:
! 42: #include <sys/cdefs.h>
! 43: #ifndef _SYS_IPC_H_
! 44: #include <sys/ipc.h>
! 45: #endif
! 46:
! 47: #if __BSD_VISIBLE
! 48:
! 49: /* shm-specific sysctl variables corresponding to members of struct shminfo */
! 50: #define KERN_SHMINFO_SHMMAX 1 /* int: max shm segment size (bytes) */
! 51: #define KERN_SHMINFO_SHMMIN 2 /* int: min shm segment size (bytes) */
! 52: #define KERN_SHMINFO_SHMMNI 3 /* int: max number of shm identifiers */
! 53: #define KERN_SHMINFO_SHMSEG 4 /* int: max shm segments per process */
! 54: #define KERN_SHMINFO_SHMALL 5 /* int: max amount of shm (pages) */
! 55: #define KERN_SHMINFO_MAXID 6 /* number of valid shared memory ids */
! 56:
! 57: #define CTL_KERN_SHMINFO_NAMES { \
! 58: { 0, 0 }, \
! 59: { "shmmax", CTLTYPE_INT }, \
! 60: { "shmmin", CTLTYPE_INT }, \
! 61: { "shmmni", CTLTYPE_INT }, \
! 62: { "shmseg", CTLTYPE_INT }, \
! 63: { "shmall", CTLTYPE_INT }, \
! 64: }
! 65:
! 66: /*
! 67: * Old (deprecated) access mode definitions--do not use.
! 68: * Provided for compatibility with old code only.
! 69: */
! 70: #define SHM_R IPC_R
! 71: #define SHM_W IPC_W
! 72:
! 73: #endif /* __BSD_VISIBLE */
! 74:
! 75: /*
! 76: * Shared memory operation flags for shmat(2).
! 77: */
! 78: #define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
! 79: #define SHM_RND 020000 /* Round attach address to SHMLBA */
! 80: #ifdef _KERNEL
! 81: #define _SHM_RMLINGER 040000 /* Attach even if segment removed */
! 82: #endif
! 83:
! 84: /*
! 85: * Shared memory specific control commands for shmctl().
! 86: * We accept but ignore these (XXX).
! 87: */
! 88: #define SHM_LOCK 3 /* Lock segment in memory. */
! 89: #define SHM_UNLOCK 4 /* Unlock a segment locked by SHM_LOCK. */
! 90:
! 91: /*
! 92: * Segment low boundry address multiple
! 93: * Use PAGE_SIZE for kernel but for userland query the kernel for the value.
! 94: */
! 95: #if defined(_KERNEL) || defined(_STANDALONE) || defined(_LKM)
! 96: #define SHMLBA PAGE_SIZE
! 97: #else
! 98: #define SHMLBA (getpagesize())
! 99: #endif /* _KERNEL || _STANDALONE || _LKM */
! 100:
! 101: typedef short shmatt_t;
! 102:
! 103: struct shmid_ds {
! 104: struct ipc_perm shm_perm; /* operation permission structure */
! 105: int shm_segsz; /* size of segment in bytes */
! 106: pid_t shm_lpid; /* process ID of last shm op */
! 107: pid_t shm_cpid; /* process ID of creator */
! 108: shmatt_t shm_nattch; /* number of current attaches */
! 109: time_t shm_atime; /* time of last shmat() */
! 110: time_t shm_dtime; /* time of last shmdt() */
! 111: time_t shm_ctime; /* time of last change by shmctl() */
! 112: void *shm_internal; /* implementation specific data */
! 113: };
! 114:
! 115: #ifdef _KERNEL
! 116: struct shmid_ds23 {
! 117: struct ipc_perm23 shm_perm; /* operation permission structure */
! 118: int shm_segsz; /* size of segment in bytes */
! 119: pid_t shm_lpid; /* process ID of last shm op */
! 120: pid_t shm_cpid; /* process ID of creator */
! 121: shmatt_t shm_nattch; /* number of current attaches */
! 122: time_t shm_atime; /* time of last shmat() */
! 123: time_t shm_dtime; /* time of last shmdt() */
! 124: time_t shm_ctime; /* time of last change by shmctl() */
! 125: void *shm_internal; /* implementation specific data */
! 126: };
! 127:
! 128: struct shmid_ds35 {
! 129: struct ipc_perm35 shm_perm; /* operation permission structure */
! 130: int shm_segsz; /* size of segment in bytes */
! 131: pid_t shm_lpid; /* process ID of last shm op */
! 132: pid_t shm_cpid; /* process ID of creator */
! 133: shmatt_t shm_nattch; /* number of current attaches */
! 134: time_t shm_atime; /* time of last shmat() */
! 135: time_t shm_dtime; /* time of last shmdt() */
! 136: time_t shm_ctime; /* time of last change by shmctl() */
! 137: void *shm_internal;/* implementation specific data */
! 138: };
! 139: #endif
! 140:
! 141: #if __BSD_VISIBLE
! 142: /*
! 143: * System V style catch-all structure for shared memory constants that
! 144: * might be of interest to user programs. Do we really want/need this?
! 145: */
! 146: struct shminfo {
! 147: int shmmax; /* max shared memory segment size (bytes) */
! 148: int shmmin; /* min shared memory segment size (bytes) */
! 149: int shmmni; /* max number of shared memory identifiers */
! 150: int shmseg; /* max shared memory segments per process */
! 151: int shmall; /* max amount of shared memory (pages) */
! 152: };
! 153:
! 154: struct shm_sysctl_info {
! 155: struct shminfo shminfo;
! 156: struct shmid_ds shmids[1];
! 157: };
! 158: #endif /* __BSD_VISIBLE */
! 159:
! 160: #ifdef _KERNEL
! 161: extern struct shminfo shminfo;
! 162: extern struct shmid_ds **shmsegs;
! 163:
! 164: /* initial values for machdep.c */
! 165: extern int shmseg;
! 166: extern int shmmaxpgs;
! 167:
! 168: struct proc;
! 169: struct vmspace;
! 170:
! 171: void shminit(void);
! 172: void shmfork(struct vmspace *, struct vmspace *);
! 173: void shmexit(struct vmspace *);
! 174: int sysctl_sysvshm(int *, u_int, void *, size_t *, void *, size_t);
! 175: int shmctl1(struct proc *, int, int, caddr_t,
! 176: int (*)(const void *, void *, size_t),
! 177: int (*)(const void *, void *, size_t));
! 178:
! 179: #else /* !_KERNEL */
! 180:
! 181: __BEGIN_DECLS
! 182: void *shmat(int, const void *, int);
! 183: int shmctl(int, int, struct shmid_ds *);
! 184: int shmdt(const void *);
! 185: int shmget(key_t, size_t, int);
! 186: __END_DECLS
! 187:
! 188: #endif /* !_KERNEL */
! 189:
! 190: #endif /* !_SYS_SHM_H_ */
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