Something went wrong. Try again.
Cider Isn't Darwin Emulation, Really
Something went wrong. Try again.
6.3 kB · 179 lines
C
at android
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180/* * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ *//* * Copyright (c) 1996 John S. Dyson * 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 immediately at the beginning of the file, without modification, * 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. Absolutely no warranty of function or purpose is made by the author * John S. Dyson. * 4. This work was done expressly for inclusion into FreeBSD. Other use * is allowed if this notation is included. * 5. Modifications may be freely made to this file if the above conditions * are met. * * $FreeBSD: src/sys/sys/pipe.h,v 1.24 2003/08/13 20:01:38 alc Exp $ *//* * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce * support for mandatory and extensible security protections. This notice * is included in support of clause 2.2 (b) of the Apple Public License, * Version 2.0. */
#ifndef _SYS_PIPE_H_#define _SYS_PIPE_H_
#ifdef KERNEL#include <libkern/locks.h>#endif#include <sys/queue.h> /* for TAILQ macros */#include <sys/ev.h>#include <sys/cdefs.h>
/* * Pipe buffer size, keep moderate in value, pipes take kva space. */#ifndef PIPE_SIZE#define PIPE_SIZE 16384#endif
#define PIPE_KVAMAX (1024 * 1024 * 16)
#ifndef BIG_PIPE_SIZE#define BIG_PIPE_SIZE (64*1024)#endif
#ifndef SMALL_PIPE_SIZE#define SMALL_PIPE_SIZE PAGE_SIZE#endif
/* * PIPE_MINDIRECT MUST be smaller than PIPE_SIZE and MUST be bigger * than PIPE_BUF. */#ifndef PIPE_MINDIRECT#define PIPE_MINDIRECT 8192#endif
#define PIPENPAGES (BIG_PIPE_SIZE / PAGE_SIZE + 1)
/* * Pipe buffer information. * Separate in, out, cnt are used to simplify calculations. * Buffered write is active when the buffer.cnt field is set. */struct pipebuf { u_int cnt; /* number of chars currently in buffer */ u_int in; /* in pointer */ u_int out; /* out pointer */ u_int size; /* size of buffer */ caddr_t buffer; /* kva of buffer */};
#ifdef PIPE_DIRECT/* * Information to support direct transfers between processes for pipes. */struct pipemapping { vm_offset_t kva; /* kernel virtual address */ vm_size_t cnt; /* number of chars in buffer */ vm_size_t pos; /* current position of transfer */ int npages; /* number of pages */ vm_page_t ms[PIPENPAGES]; /* pages in source process */};#endif
/* * Bits in pipe_state. */#define PIPE_ASYNC 0x004 /* Async? I/O. */#define PIPE_WANTR 0x008 /* Reader wants some characters. */#define PIPE_WANTW 0x010 /* Writer wants space to put characters. */#define PIPE_WANT 0x020 /* Pipe is wanted to be run-down. */#define PIPE_SEL 0x040 /* Pipe has a select active. */#define PIPE_EOF 0x080 /* Pipe is in EOF condition. */#define PIPE_LOCKFL 0x100 /* Process has 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_DIRECTOK 0x800 /* Direct mode ok. */#define PIPE_KNOTE 0x1000 /* Pipe has kernel events activated */#define PIPE_DRAIN 0x2000 /* Waiting for I/O to drop for a close. Treated like EOF; only separate for easier debugging. */#define PIPE_WSELECT 0x4000 /* Some thread has done an FWRITE select on the pipe */#define PIPE_DEAD 0x8000 /* Pipe is dead and needs garbage collection */
#ifdef KERNEL
struct label;
/* * Per-pipe data structure. * Two of these are linked together to produce bi-directional pipes. */struct pipe { struct pipebuf pipe_buffer; /* data storage */#ifdef PIPE_DIRECT struct pipemapping pipe_map; /* pipe mapping for direct I/O */#endif struct selinfo pipe_sel; /* for compat with select */ pid_t pipe_pgid; /* information for async I/O */ struct pipe *pipe_peer; /* link with other direction */ u_int pipe_state; /* pipe status info */ int pipe_busy; /* busy flag, mostly to handle rundown sanely */ TAILQ_HEAD(,eventqelt) pipe_evlist; lck_mtx_t *pipe_mtxp; /* shared mutex between both pipes */ struct timespec st_atimespec; /* time of last access */ struct timespec st_mtimespec; /* time of last data modification */ struct timespec st_ctimespec; /* time of last status change */ struct label *pipe_label; /* pipe MAC label - shared */};
#define PIPE_MTX(pipe) ((pipe)->pipe_mtxp)
#define PIPE_LOCK(pipe) lck_mtx_lock(PIPE_MTX(pipe))#define PIPE_UNLOCK(pipe) lck_mtx_unlock(PIPE_MTX(pipe))#define PIPE_LOCK_ASSERT(pipe, type) lck_mtx_assert(PIPE_MTX(pipe), (type))
__BEGIN_DECLSvoid pipeinit(void);extern int pipe_stat(struct pipe *, void *, int);__END_DECLS
#endif /* KERNEL */
#endif /* !_SYS_PIPE_H_ */