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 stat;
   49 struct proc;
   50 struct uio;
   51 struct knote;
   52 
   53 /*
   54  * Kernel descriptor table.
   55  * One entry for each open kernel vnode and socket.
   56  */
   57 struct file {
   58         LIST_ENTRY(file) f_list;/* list of active files */
   59         short   f_FILLER3;      /* (old f_flag) */
   60 #define DTYPE_VNODE     1       /* file */
   61 #define DTYPE_SOCKET    2       /* communications endpoint */
   62 #define DTYPE_PIPE      3       /* pipe */
   63 #define DTYPE_FIFO      4       /* fifo (named pipe) */
   64 #define DTYPE_KQUEUE    5       /* event queue */
   65 #define DTYPE_CRYPTO    6       /* crypto */
   66         short   f_type;         /* descriptor type */
   67         u_int   f_flag;         /* see fcntl.h */
   68         struct  ucred *f_cred;  /* credentials associated with descriptor */
   69         struct  fileops {
   70                 int     (*fo_read)      __P((struct file *fp, struct uio *uio,
   71                                             struct ucred *cred, int flags,
   72                                             struct proc *p));
   73                 int     (*fo_write)     __P((struct file *fp, struct uio *uio,
   74                                             struct ucred *cred, int flags,
   75                                             struct proc *p));
   76 #define FOF_OFFSET      1
   77                 int     (*fo_ioctl)     __P((struct file *fp, u_long com,
   78                                             caddr_t data, struct proc *p));
   79                 int     (*fo_poll)      __P((struct file *fp, int events,
   80                                             struct ucred *cred, struct proc *p));
   81                 int     (*fo_kqfilter)  __P((struct file *fp,
   82                                             struct knote *kn));
   83                 int     (*fo_stat)      __P((struct file *fp, struct stat *sb,
   84                                             struct proc *p));
   85                 int     (*fo_close)     __P((struct file *fp, struct proc *p));
   86         } *f_ops;
   87         int     f_seqcount;     /*
   88                                  * count of sequential accesses -- cleared
   89                                  * by most seek operations.
   90                                  */
   91         off_t   f_nextoff;      /*
   92                                  * offset of next expected read or write
   93                                  */
   94         off_t   f_offset;
   95         caddr_t f_data;         /* vnode or socket */
   96         int     f_count;        /* reference count */
   97         int     f_msgcount;     /* reference count from message queue */
   98 };
   99 
  100 #ifdef MALLOC_DECLARE
  101 MALLOC_DECLARE(M_FILE);
  102 #endif
  103 
  104 LIST_HEAD(filelist, file);
  105 extern struct filelist filehead; /* head of list of open files */
  106 extern struct fileops vnops;
  107 extern struct fileops badfileops;
  108 extern int maxfiles;            /* kernel limit on number of open files */
  109 extern int maxfilesperproc;     /* per process limit on number of open files */
  110 extern int nfiles;              /* actual number of open files */
  111 
  112 static __inline void fhold __P((struct file *fp));
  113 int fdrop __P((struct file *fp, struct proc *p));
  114 
  115 static __inline void
  116 fhold(fp)
  117         struct file *fp;
  118 {
  119 
  120         fp->f_count++;
  121 }
  122 
  123 static __inline int fo_read __P((struct file *fp, struct uio *uio,
  124     struct ucred *cred, int flags, struct proc *p));
  125 static __inline int fo_write __P((struct file *fp, struct uio *uio,
  126     struct ucred *cred, int flags, struct proc *p));
  127 static __inline int fo_ioctl __P((struct file *fp, u_long com, caddr_t data,
  128     struct proc *p));
  129 static __inline int fo_poll __P((struct file *fp, int events,
  130     struct ucred *cred, struct proc *p));
  131 static __inline int fo_stat __P((struct file *fp, struct stat *sb,
  132     struct proc *p));
  133 static __inline int fo_close __P((struct file *fp, struct proc *p));
  134 static __inline int fo_kqfilter __P((struct file *fp, struct knote *kn));
  135 
  136 static __inline int
  137 fo_read(fp, uio, cred, flags, p)
  138         struct file *fp;
  139         struct uio *uio;
  140         struct ucred *cred;
  141         struct proc *p;
  142         int flags;
  143 {
  144         int error;
  145 
  146         fhold(fp);
  147         error = (*fp->f_ops->fo_read)(fp, uio, cred, flags, p);
  148         fdrop(fp, p);
  149         return (error);
  150 }
  151 
  152 static __inline int
  153 fo_write(fp, uio, cred, flags, p)
  154         struct file *fp;
  155         struct uio *uio;
  156         struct ucred *cred;
  157         struct proc *p;
  158         int flags;
  159 {
  160         int error;
  161 
  162         fhold(fp);
  163         error = (*fp->f_ops->fo_write)(fp, uio, cred, flags, p);
  164         fdrop(fp, p);
  165         return (error);
  166 }
  167 
  168 static __inline int
  169 fo_ioctl(fp, com, data, p)
  170         struct file *fp;
  171         u_long com;
  172         caddr_t data;
  173         struct proc *p;
  174 {
  175         int error;
  176 
  177         fhold(fp);
  178         error = (*fp->f_ops->fo_ioctl)(fp, com, data, p);
  179         fdrop(fp, p);
  180         return (error);
  181 }
  182 
  183 static __inline int
  184 fo_poll(fp, events, cred, p)
  185         struct file *fp;
  186         int events;
  187         struct ucred *cred;
  188         struct proc *p;
  189 {
  190         int error;
  191 
  192         fhold(fp);
  193         error = (*fp->f_ops->fo_poll)(fp, events, cred, p);
  194         fdrop(fp, p);
  195         return (error);
  196 }
  197 
  198 static __inline int
  199 fo_stat(fp, sb, p)
  200         struct file *fp;
  201         struct stat *sb;
  202         struct proc *p;
  203 {
  204         int error;
  205 
  206         fhold(fp);
  207         error = (*fp->f_ops->fo_stat)(fp, sb, p);
  208         fdrop(fp, p);
  209         return (error);
  210 }
  211 
  212 static __inline int
  213 fo_close(fp, p)
  214         struct file *fp;
  215         struct proc *p;
  216 {
  217 
  218         return ((*fp->f_ops->fo_close)(fp, p));
  219 }
  220 
  221 static __inline int
  222 fo_kqfilter(fp, kn)
  223         struct file *fp;
  224         struct knote *kn;
  225 {
  226 
  227         return ((*fp->f_ops->fo_kqfilter)(fp, kn));
  228 }
  229 
  230 #endif /* _KERNEL */
  231 
  232 #endif /* !SYS_FILE_H */

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

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sys/sys/file.h