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Made this self-sufficent (except for <sys/types.h>) when compiled in

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user mode.

Improved formatting and comments (mostly punctuation in comments).
This commit is contained in:
Bruce Evans 1996-05-01 04:18:20 +00:00
parent b1d3d2ffcf
commit 3da92a61e0
1 changed files with 43 additions and 35 deletions
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78
sys/sys/pipe.h
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@ -18,32 +18,42 @@
* 5. Modifications may be freely made to this file if the above conditions * 5. Modifications may be freely made to this file if the above conditions
* are met. * are met.
* *
* $Id: pipe.h,v 1.1 1996/01/28 23:38:22 dyson Exp $ * $Id: pipe.h,v 1.3 1996/02/04 19:56:14 dyson Exp $
*/ */
#ifndef _SYS_PIPE_H_
#define _SYS_PIPE_H_
#ifndef OLD_PIPE #ifndef OLD_PIPE
struct vm_object; #ifndef KERNEL
#include <sys/time.h> /* for struct timeval */
#include <sys/select.h> /* for struct selinfo */
#include <vm/vm.h> /* for vm_page_t */
#include <machine/param.h> /* for PAGE_SIZE */
#endif
/* /*
* Pipe buffer size, keep moderate in value, pipes take kva space. * Pipe buffer size, keep moderate in value, pipes take kva space.
*/ */
#ifndef PIPE_SIZE #ifndef PIPE_SIZE
#define PIPE_SIZE (16384) #define PIPE_SIZE 16384
#endif #endif
/* /*
* PIPE_MINDIRECT MUST be smaller than PIPE_SIZE and MUST be bigger * PIPE_MINDIRECT MUST be smaller than PIPE_SIZE and MUST be bigger
* than PIPE_BUF * than PIPE_BUF.
*/ */
#ifndef PIPE_MINDIRECT #ifndef PIPE_MINDIRECT
#define PIPE_MINDIRECT (8192) #define PIPE_MINDIRECT 8192
#endif #endif
#define PIPENPAGES (PIPE_SIZE/PAGE_SIZE + 1) #define PIPENPAGES (PIPE_SIZE / PAGE_SIZE + 1)
/* /*
* pipe buffer information * Pipe buffer information.
* Seperate in, out, cnt is used to simplify calculations. * Separate in, out, cnt are used to simplify calculations.
* Buffered write is active when the buffer.cnt field is set.
*/ */
struct pipebuf { struct pipebuf {
u_int cnt; /* number of chars currently in buffer */ u_int cnt; /* number of chars currently in buffer */
@ -51,11 +61,11 @@ struct pipebuf {
u_int out; /* out pointer */ u_int out; /* out pointer */
u_int size; /* size of buffer */ u_int size; /* size of buffer */
caddr_t buffer; /* kva of buffer */ caddr_t buffer; /* kva of buffer */
struct vm_object *object; /* VM object containing buffer */ struct vm_object *object; /* VM object containing buffer */
}; };
/* /*
* information to support direct transfers between processes for pipes * Information to support direct transfers between processes for pipes.
*/ */
struct pipemapping { struct pipemapping {
vm_offset_t kva; /* kernel virtual address */ vm_offset_t kva; /* kernel virtual address */
@ -66,43 +76,41 @@ struct pipemapping {
}; };
/* /*
* pipe_state bits * Bits in pipe_state.
*/ */
#define PIPE_NBIO 0x1 /* non-blocking I/O */ #define PIPE_NBIO 0x001 /* Non-blocking I/O. */
#define PIPE_ASYNC 0x4 /* Async? I/O */ #define PIPE_ASYNC 0x004 /* Async? I/O. */
#define PIPE_WANTR 0x8 /* Reader wants some characters */ #define PIPE_WANTR 0x008 /* Reader wants some characters. */
#define PIPE_WANTW 0x10 /* Writer wants space to put characters */ #define PIPE_WANTW 0x010 /* Writer wants space to put characters. */
#define PIPE_WANT 0x20 /* Pipe is wanted to be run-down */ #define PIPE_WANT 0x020 /* Pipe is wanted to be run-down. */
#define PIPE_SEL 0x40 /* Pipe has a select active */ #define PIPE_SEL 0x040 /* Pipe has a select active. */
#define PIPE_EOF 0x80 /* Pipe is in EOF condition */ #define PIPE_EOF 0x080 /* Pipe is in EOF condition. */
#define PIPE_LOCK 0x100 /* Process has exclusive access to pointers/data */ #define PIPE_LOCK 0x100 /* Process has exclusive access to pointers/data. */
#define PIPE_LWANT 0x200 /* Process wants exclusive access to pointers/data */ #define PIPE_LWANT 0x200 /* Process wants exclusive access to pointers/data. */
#define PIPE_DIRECTW 0x400 /* Pipe direct write active */ #define PIPE_DIRECTW 0x400 /* Pipe direct write active. */
#define PIPE_DIRECTOK 0x800 /* Direct mode ok */ #define PIPE_DIRECTOK 0x800 /* Direct mode ok. */
/* /*
* Buffered write is active when buffer.cnt * Per-pipe data structure.
* field is set. * Two of these are linked together to produce bi-directional pipes.
*/
/*
* Per-pipe data structure
* Two of these are linked together to produce bi-directional
* pipes.
*/ */
struct pipe { struct pipe {
struct pipebuf pipe_buffer; /* data storage */ struct pipebuf pipe_buffer; /* data storage */
struct pipemapping pipe_map; /* pipe mapping for dir I/O */ struct pipemapping pipe_map; /* pipe mapping for direct I/O */
struct selinfo pipe_sel; /* for compat with select */ struct selinfo pipe_sel; /* for compat with select */
struct timeval pipe_atime; /* time of last access */ struct timeval pipe_atime; /* time of last access */
struct timeval pipe_mtime; /* time of last modify */ struct timeval pipe_mtime; /* time of last modify */
struct timeval pipe_ctime; /* time of status change */ struct timeval pipe_ctime; /* time of status change */
int pipe_pgid; int pipe_pgid; /* process/group for async I/O */
struct pipe *pipe_peer; /* link with other direction */ struct pipe *pipe_peer; /* link with other direction */
u_int pipe_state; /* pipe status info */ u_int pipe_state; /* pipe status info */
int pipe_busy; /* busy flag, mostly to handle rundown sanely */ int pipe_busy; /* busy flag, mostly to handle rundown sanely */
}; };
int pipe_stat __P((struct pipe *pipe, struct stat *ub)); #ifdef KERNEL
int pipe_stat __P((struct pipe *pipe, struct stat *ub));
#endif #endif
#endif /* !OLD_PIPE */
#endif /* !_SYS_PIPE_H_ */