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

     /*
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  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, 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)file.h      8.3 (Berkeley) 1/9/95
     * $FreeBSD: releng/5.0/sys/sys/file.h 104480 2002-10-04 20:34:30Z sam $
     */
    
    #ifndef _SYS_FILE_H_
    #define _SYS_FILE_H_
    
    #ifndef _KERNEL
    #include <sys/types.h> /* XXX */
    #include <sys/fcntl.h>
    #include <sys/unistd.h>
    #else
    #include <sys/queue.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    
    struct stat;
    struct thread;
    struct uio;
    struct knote;
    struct vnode;
    struct socket;
    
    #endif /* _KERNEL */
    
    #define DTYPE_VNODE     1       /* file */
    #define DTYPE_SOCKET    2       /* communications endpoint */
    #define DTYPE_PIPE      3       /* pipe */
    #define DTYPE_FIFO      4       /* fifo (named pipe) */
    #define DTYPE_KQUEUE    5       /* event queue */
    #define DTYPE_CRYPTO    6       /* crypto */
    
    #ifdef _KERNEL
    
    /*
     * Kernel descriptor table.
     * One entry for each open kernel vnode and socket.
     *
     * Below is the list of locks that protects members in struct file.
     *
     * (fl) filelist_lock
     * (f)  f_mtx in struct file
     * none not locked
     */
    struct file {
            LIST_ENTRY(file) f_list;/* (fl) list of active files */
            short   f_gcflag;       /* used by thread doing fd garbage collection */
            short   f_type;         /* descriptor type */
            int     f_count;        /* (f) reference count */
            int     f_msgcount;     /* (f) references from message queue */
            struct  ucred *f_cred;  /* credentials associated with descriptor */
            struct fileops {
                    int     (*fo_read)(struct file *fp, struct uio *uio,
                                struct ucred *active_cred, int flags,
                                struct thread *td);
                    int     (*fo_write)(struct file *fp, struct uio *uio,
                                struct ucred *active_cred, int flags,
                                struct thread *td);
    #define FOF_OFFSET      1
                    int     (*fo_ioctl)(struct file *fp, u_long com, void *data,
                                struct ucred *active_cred, struct thread *td);
                    int     (*fo_poll)(struct file *fp, int events,
                                struct ucred *active_cred, struct thread *td);
                    int     (*fo_kqfilter)(struct file *fp, struct knote *kn);
                    int     (*fo_stat)(struct file *fp, struct stat *sb,
                                struct ucred *active_cred, struct thread *td);
                    int     (*fo_close)(struct file *fp, struct thread *td);
           } *f_ops;
           int     f_seqcount;     /*
                                    * count of sequential accesses -- cleared
                                    * by most seek operations.
                                    */
           off_t   f_nextoff;      /*
                                    * offset of next expected read or write
                                    */
           off_t   f_offset;
           void    *f_data;                /* vnode or socket */
           u_int   f_flag;         /* see fcntl.h */
           struct mtx      *f_mtxp;        /* mutex to protect data */
   };
   
   #endif /* _KERNEL */
   
   /*
    * Userland version of struct file, for sysctl
    */
   struct xfile {
           size_t  xf_size;        /* size of struct xfile */
           pid_t   xf_pid;         /* owning process */
           uid_t   xf_uid;         /* effective uid of owning process */
           int     xf_fd;          /* descriptor number */
           void    *xf_file;       /* address of struct file */
           short   xf_type;        /* descriptor type */
           int     xf_count;       /* reference count */
           int     xf_msgcount;    /* references from message queue */
           off_t   xf_offset;      /* file offset */
           void    *xf_data;       /* pointer to vnode or socket */
           u_int   xf_flag;        /* flags (see fcntl.h) */
   };
   
   #ifdef _KERNEL
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_FILE);
   #endif
   
   LIST_HEAD(filelist, file);
   extern struct filelist filehead; /* (fl) head of list of open files */
   extern struct fileops vnops;
   extern struct fileops badfileops;
   extern int maxfiles;            /* kernel limit on number of open files */
   extern int maxfilesperproc;     /* per process limit on number of open files */
   extern int nfiles;              /* (fl) actual number of open files */
   extern struct sx filelist_lock; /* sx to protect filelist and nfiles */
   
   int fget(struct thread *td, int fd, struct file **fpp);
   int fget_read(struct thread *td, int fd, struct file **fpp);
   int fget_write(struct thread *td, int fd, struct file **fpp);
   int fdrop(struct file *fp, struct thread *td);
   int fdrop_locked(struct file *fp, struct thread *td);
   
   /* Lock a file. */
   #define FILE_LOCK(f)    mtx_lock((f)->f_mtxp)
   #define FILE_UNLOCK(f)  mtx_unlock((f)->f_mtxp)
   #define FILE_LOCKED(f)  mtx_owned((f)->f_mtxp)
   #define FILE_LOCK_ASSERT(f, type) mtx_assert((f)->f_mtxp, (type))
   
   int fgetvp(struct thread *td, int fd, struct vnode **vpp);
   int fgetvp_read(struct thread *td, int fd, struct vnode **vpp);
   int fgetvp_write(struct thread *td, int fd, struct vnode **vpp);
   
   int fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp);
   void fputsock(struct socket *sp);
   
   #define fhold_locked(fp)                                                \
           do {                                                            \
                   FILE_LOCK_ASSERT(fp, MA_OWNED);                         \
                   (fp)->f_count++;                                        \
           } while (0)
   
   #define fhold(fp)                                                       \
           do {                                                            \
                   FILE_LOCK(fp);                                          \
                   fhold_locked(fp);                                       \
                   FILE_UNLOCK(fp);                                        \
           } while (0)
   
   static __inline int fo_read(struct file *fp, struct uio *uio,
       struct ucred *active_cred, int flags, struct thread *td);
   static __inline int fo_write(struct file *fp, struct uio *uio,
       struct ucred *active_cred, int flags, struct thread *td);
   static __inline int fo_ioctl(struct file *fp, u_long com, void *data,
       struct ucred *active_cred, struct thread *td);
   static __inline int fo_poll(struct file *fp, int events,
       struct ucred *active_cred, struct thread *td);
   static __inline int fo_stat(struct file *fp, struct stat *sb,
       struct ucred *active_cred, struct thread *td);
   static __inline int fo_close(struct file *fp, struct thread *td);
   static __inline int fo_kqfilter(struct file *fp, struct knote *kn);
   struct proc;
   
   static __inline int
   fo_read(fp, uio, active_cred, flags, td)
           struct file *fp;
           struct uio *uio;
           struct ucred *active_cred;
           int flags;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
   }
   
   static __inline int
   fo_write(fp, uio, active_cred, flags, td)
           struct file *fp;
           struct uio *uio;
           struct ucred *active_cred;
           struct thread *td;
           int flags;
   {
   
           return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
   }
   
   static __inline int
   fo_ioctl(fp, com, data, active_cred, td)
           struct file *fp;
           u_long com;
           void *data;
           struct ucred *active_cred;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
   }
   
   static __inline int
   fo_poll(fp, events, active_cred, td)
           struct file *fp;
           int events;
           struct ucred *active_cred;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
   }
   
   static __inline int
   fo_stat(fp, sb, active_cred, td)
           struct file *fp;
           struct stat *sb;
           struct ucred *active_cred;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
   }
   
   static __inline int
   fo_close(fp, td)
           struct file *fp;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_close)(fp, td));
   }
   
   static __inline int
   fo_kqfilter(fp, kn)
           struct file *fp;
           struct knote *kn;
   {
   
           return ((*fp->f_ops->fo_kqfilter)(fp, kn));
   }
   
   #endif /* _KERNEL */
   
   #endif /* !SYS_FILE_H */

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