file.h

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    1 /*
    2  * Copyright (c) 1982, 1986, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)file.h      8.3 (Berkeley) 1/9/95
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _SYS_FILE_H_
   38 #define _SYS_FILE_H_
   39 
   40 #ifndef KERNEL
   41 #include <sys/fcntl.h>
   42 #include <sys/unistd.h>
   43 #endif
   44 
   45 #ifdef KERNEL
   46 #include <sys/queue.h>
   47 
   48 struct proc;
   49 struct uio;
   50 
   51 /*
   52  * Kernel descriptor table.
   53  * One entry for each open kernel vnode and socket.
   54  */
   55 struct file {
   56         LIST_ENTRY(file) f_list;/* list of active files */
   57         short   f_flag;         /* see fcntl.h */
   58 #define DTYPE_VNODE     1       /* file */
   59 #define DTYPE_SOCKET    2       /* communications endpoint */
   60 #define DTYPE_PIPE      3       /* pipe */
   61 #define DTYPE_FIFO      4       /* fifo (named pipe) */
   62         short   f_type;         /* descriptor type */
   63         short   f_count;        /* reference count */
   64         short   f_msgcount;     /* references from message queue */
   65         struct  ucred *f_cred;  /* credentials associated with descriptor */
   66         struct  fileops {
   67                 int     (*fo_read)      __P((struct file *fp, struct uio *uio,
   68                                             struct ucred *cred, int flags));
   69                 int     (*fo_write)     __P((struct file *fp, struct uio *uio,
   70                                             struct ucred *cred, int flags));
   71 #define FOF_OFFSET      1
   72                 int     (*fo_ioctl)     __P((struct file *fp, u_long com,
   73                                             caddr_t data, struct proc *p));
   74                 int     (*fo_poll)      __P((struct file *fp, int events,
   75                                             struct ucred *cred, struct proc *p));
   76                 int     (*fo_close)     __P((struct file *fp, struct proc *p));
   77         } *f_ops;
   78         int     f_seqcount;     /*
   79                                  * count of sequential accesses -- cleared
   80                                  * by most seek operations.
   81                                  */
   82         off_t   f_nextread;     /*
   83                                  * offset of next expected read
   84                                  */
   85         off_t   f_offset;
   86         caddr_t f_data;         /* vnode or socket */
   87 };
   88 
   89 #ifdef MALLOC_DECLARE
   90 MALLOC_DECLARE(M_FILE);
   91 #endif
   92 
   93 LIST_HEAD(filelist, file);
   94 extern struct filelist filehead; /* head of list of open files */
   95 extern struct fileops vnops;
   96 extern int maxfiles;            /* kernel limit on number of open files */
   97 extern int maxfilesperproc;     /* per process limit on number of open files */
   98 extern int nfiles;              /* actual number of open files */
   99 
  100 #endif /* KERNEL */
  101 
  102 #endif /* !SYS_FILE_H */

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FreeBSD/Linux Kernel Cross Reference sys/sys/file.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/file.h