130 lines
4.8 KiB
C
130 lines
4.8 KiB
C
/* $NetBSD: filedesc.h,v 1.20 2001/02/26 16:37:38 lukem Exp $ */
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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, 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)filedesc.h 8.1 (Berkeley) 6/2/93
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*/
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#ifndef _SYS_FILEDESC_H_
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#define _SYS_FILEDESC_H_
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/*
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* This structure is used for the management of descriptors. It may be
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* shared by multiple processes.
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*
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* A process is initially started out with NDFILE descriptors stored within
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* this structure, selected to be enough for typical applications based on
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* the historical limit of 20 open files (and the usage of descriptors by
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* shells). If these descriptors are exhausted, a larger descriptor table
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* may be allocated, up to a process' resource limit; the internal arrays
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* are then unused. The initial expansion is set to NDEXTENT; each time
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* it runs out, it is doubled until the resource limit is reached. NDEXTENT
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* should be selected to be the biggest multiple of OFILESIZE (see below)
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* that will fit in a power-of-two sized piece of memory.
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*/
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#define NDFILE 20
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#define NDEXTENT 50 /* 250 bytes in 256-byte alloc */
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struct filedesc {
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struct file **fd_ofiles; /* file structures for open files */
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char *fd_ofileflags; /* per-process open file flags */
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int fd_nfiles; /* number of open files allocated */
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int fd_lastfile; /* high-water mark of fd_ofiles */
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int fd_freefile; /* approx. next free file */
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int fd_refcnt; /* reference count */
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};
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struct cwdinfo {
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struct vnode *cwdi_cdir; /* current directory */
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struct vnode *cwdi_rdir; /* root directory */
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u_short cwdi_cmask; /* mask for file creation */
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u_short cwdi_refcnt; /* reference count */
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};
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/*
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* Basic allocation of descriptors:
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* one of the above, plus arrays for NDFILE descriptors.
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*/
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struct filedesc0 {
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struct filedesc fd_fd;
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/*
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* These arrays are used when the number of open files is
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* <= NDFILE, and are then pointed to by the pointers above.
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*/
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struct file *fd_dfiles[NDFILE];
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char fd_dfileflags[NDFILE];
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};
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/*
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* Per-process open flags.
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*/
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#define UF_EXCLOSE 0x01 /* auto-close on exec */
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#define UF_MAPPED 0x02 /* mapped from device */
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/*
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* Storage required per open file descriptor.
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*/
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#define OFILESIZE (sizeof(struct file *) + sizeof(char))
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#ifdef _KERNEL
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/*
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* Kernel global variables and routines.
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*/
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int dupfdopen(struct proc *p, int indx, int dfd, int mode, int error);
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int fdalloc(struct proc *p, int want, int *result);
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int fdavail(struct proc *p, int n);
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int falloc(struct proc *p, struct file **resultfp, int *resultfd);
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void ffree(struct file *);
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struct filedesc *fdcopy(struct proc *p);
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struct filedesc *fdinit(struct proc *p);
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void fdshare(struct proc *p1, struct proc *p2);
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void fdunshare(struct proc *p);
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void fdinit1(struct filedesc0 *newfdp);
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void fdclear(struct proc *p);
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void fdfree(struct proc *p);
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void fdremove(struct filedesc *, int);
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int fdrelease(struct proc *p, int);
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void fdcloseexec(struct proc *);
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struct cwdinfo *cwdinit(struct proc *);
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void cwdshare(struct proc *, struct proc *);
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void cwdunshare(struct proc *);
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void cwdfree(struct proc *);
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int closef(struct file *, struct proc *);
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int getsock(struct filedesc *, int, struct file **);
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#endif /* _KERNEL */
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#endif /* !_SYS_FILEDESC_H_ */
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