74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
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* Copyright (c) 1996 John S. Dyson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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* 4. This work was done expressly for inclusion into FreeBSD. Other use
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* is allowed if this notation is included.
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* 5. Modifications may be freely made to this file if the above conditions
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* are met.
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*
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* $Id$
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*/
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#ifndef OLD_PIPE
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struct vm_object;
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/*
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* pipe buffer information
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* Seperate in, out, cnt is used to simplify calculations.
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*/
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struct pipebuf {
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u_int cnt; /* number of chars currently in buffer */
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u_int in; /* in pointer */
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u_int out; /* out pointer */
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u_int size; /* size of buffer */
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caddr_t buffer; /* kva of buffer */
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struct vm_object *object; /* VM object containing buffer */
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};
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/*
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* pipe_state bits
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*/
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#define PIPE_NBIO 0x1 /* non-blocking I/O */
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#define PIPE_ASYNC 0x4 /* Async? I/O */
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#define PIPE_WANTR 0x8 /* Reader wants some characters */
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#define PIPE_WANTW 0x10 /* Writer wants space to put characters */
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#define PIPE_WANT 0x20 /* Pipe is wanted to be run-down */
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#define PIPE_SEL 0x40 /* Pipe has a select active */
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#define PIPE_EOF 0x80 /* Pipe is in EOF condition */
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#define PIPE_LOCK 0x100 /* Process has exclusive access to pointers/data */
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#define PIPE_LWANT 0x200 /* Process wants exclusive access to pointers/data */
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/*
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* Per-pipe data structure
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* Two of these are linked together to produce bi-directional
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* pipes.
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*/
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struct pipe {
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struct pipebuf pipe_buffer; /* data storage */
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struct selinfo pipe_sel; /* for compat with select */
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struct timeval pipe_atime; /* time of last access */
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struct timeval pipe_mtime; /* time of last modify */
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struct timeval pipe_ctime; /* time of status change */
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int pipe_pgid;
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struct pipe *pipe_peer; /* link with other direction */
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u_int pipe_state; /* pipe status info */
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int pipe_busy; /* busy flag, mostly to handle rundown sanely */
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};
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int pipe_stat __P((struct pipe *pipe, struct stat *ub));
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#endif
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