65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/* sys/ipc.h
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Copyright 2001, 2002 Red Hat Inc.
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Written by Robert Collins <rbtcollins@hotmail.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _CYGWIN_IPC_H
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#define _CYGWIN_IPC_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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struct ipc_perm
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{
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uid_t uid; /* Owner's user ID. */
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gid_t gid; /* Owner's group ID. */
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uid_t cuid; /* Creator's user ID. */
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gid_t cgid; /* Creator's group ID. */
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mode_t mode; /* Read/write permission. */
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key_t key;
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unsigned short seq;
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};
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/* Mode bits:
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*/
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#define IPC_CREAT 0x0200 /* Create entry if key does not exist. */
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#define IPC_EXCL 0x0400 /* Fail if key exists. */
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#define IPC_NOWAIT 0x0800 /* Error if request must wait. */
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/* Keys:
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*/
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#define IPC_PRIVATE ((key_t) 0) /* Private key. */
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/* Control commands:
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*/
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#define IPC_RMID 0x1000 /* Remove identifier. */
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#define IPC_SET 0x1001 /* Set options. */
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#define IPC_STAT 0x1002 /* Get options. */
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#define IPC_INFO 0x1003 /* For ipcs(8). */
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#ifdef _KERNEL
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#define IPCID_TO_IX(id) ((id) & 0xffff)
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#define IPCID_TO_SEQ(id) (((id) >> 16) & 0xffff)
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#define IXSEQ_TO_IPCID(ix,perm) (((perm.seq) << 16) | (ix & 0xffff))
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#define IPC_R 000400 /* read permission */
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#define IPC_W 000200 /* write/alter permission */
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#define IPC_M 010000 /* permission to change control info */
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#endif
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key_t ftok (const char *path, int id);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CYGWIN_IPC_H */
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