source: rtems-libbsd/freebsd/sys/sys/file.h @ e599318

/*-
 * 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.
 * 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
 * $FreeBSD$
 */

#ifndef _SYS_FILE_H_
#define _SYS_FILE_H_

#ifndef _KERNEL
#include <rtems/bsd/sys/types.h> /* XXX */
#include <sys/fcntl.h>
#include <rtems/bsd/sys/unistd.h>
#else
#include <sys/queue.h>
#include <sys/refcount.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 */
#define DTYPE_MQUEUE    7       /* posix message queue */
#define DTYPE_SHM       8       /* swap-backed shared memory */
#define DTYPE_SEM       9       /* posix semaphore */
#define DTYPE_PTS       10      /* pseudo teletype master device */

#ifdef _KERNEL

struct file;
struct ucred;

typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
                    struct ucred *active_cred, int flags,
                    struct thread *td);
#define FOF_OFFSET      1       /* Use the offset in uio argument */
typedef int fo_truncate_t(struct file *fp, off_t length,
                    struct ucred *active_cred, struct thread *td);
typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
                    struct ucred *active_cred, struct thread *td);
typedef int fo_poll_t(struct file *fp, int events,
                    struct ucred *active_cred, struct thread *td);
typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
typedef int fo_stat_t(struct file *fp, struct stat *sb,
                    struct ucred *active_cred, struct thread *td);
typedef int fo_close_t(struct file *fp, struct thread *td);
typedef int fo_flags_t;

struct fileops {
        fo_rdwr_t       *fo_read;
        fo_rdwr_t       *fo_write;
        fo_truncate_t   *fo_truncate;
        fo_ioctl_t      *fo_ioctl;
        fo_poll_t       *fo_poll;
        fo_kqfilter_t   *fo_kqfilter;
        fo_stat_t       *fo_stat;
        fo_close_t      *fo_close;
        fo_flags_t      fo_flags;       /* DFLAG_* below */
};

#define DFLAG_PASSABLE  0x01    /* may be passed via unix sockets. */
#define DFLAG_SEEKABLE  0x02    /* seekable / nonsequential */
#endif /* _KERNEL */

#if defined(_KERNEL) || defined(_WANT_FILE)
/*
 * Kernel descriptor table.
 * One entry for each open kernel vnode and socket.
 *
 * Below is the list of locks that protects members in struct file.
 *
 * (f) protected with mtx_lock(mtx_pool_find(fp))
 * (d) cdevpriv_mtx
 * none not locked
 */

struct file {
        void            *f_data;        /* file descriptor specific data */
        struct fileops  *f_ops;         /* File operations */
        struct ucred    *f_cred;        /* associated credentials. */
        struct vnode    *f_vnode;       /* NULL or applicable vnode */
        short           f_type;         /* descriptor type */
        short           f_vnread_flags; /* (f) Sleep lock for f_offset */
        volatile u_int  f_flag;         /* see fcntl.h */
        volatile u_int  f_count;        /* reference count */
        /*
         *  DTYPE_VNODE specific fields.
         */
        int             f_seqcount;     /* Count of sequential accesses. */
        off_t           f_nextoff;      /* next expected read/write offset. */
        struct cdev_privdata *f_cdevpriv; /* (d) Private data for the cdev. */
        /*
         *  DFLAG_SEEKABLE specific fields
         */
        off_t           f_offset;
        /*
         * Mandatory Access control information.
         */
        void            *f_label;       /* Place-holder for MAC label. */
};

#define FOFFSET_LOCKED       0x1
#define FOFFSET_LOCK_WAITING 0x2                 

#endif /* _KERNEL || _WANT_FILE */

/*
 * 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;       /* file descriptor specific data */
        void    *xf_vnode;      /* vnode pointer */
        u_int   xf_flag;        /* flags (see fcntl.h) */
};

#ifdef _KERNEL

#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_FILE);
#endif

extern struct fileops vnops;
extern struct fileops badfileops;
extern struct fileops socketops;
extern int maxfiles;            /* kernel limit on number of open files */
extern int maxfilesperproc;     /* per process limit on number of open files */
extern volatile int openfiles;  /* actual number of open files */

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);

/*
 * The socket operations are used a couple of places.
 * XXX: This is wrong, they should go through the operations vector for
 * XXX: sockets instead of going directly for the individual functions. /phk
 */
fo_rdwr_t       soo_read;
fo_rdwr_t       soo_write;
fo_truncate_t   soo_truncate;
fo_ioctl_t      soo_ioctl;
fo_poll_t       soo_poll;
fo_kqfilter_t   soo_kqfilter;
fo_stat_t       soo_stat;
fo_close_t      soo_close;

void finit(struct file *, u_int, short, void *, struct fileops *);
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(fp)                                                       \
        (refcount_acquire(&(fp)->f_count))
#define fdrop(fp, td)                                                   \
        (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : 0)

static __inline fo_rdwr_t       fo_read;
static __inline fo_rdwr_t       fo_write;
static __inline fo_truncate_t   fo_truncate;
static __inline fo_ioctl_t      fo_ioctl;
static __inline fo_poll_t       fo_poll;
static __inline fo_kqfilter_t   fo_kqfilter;
static __inline fo_stat_t       fo_stat;
static __inline fo_close_t      fo_close;

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;
        int flags;
        struct thread *td;
{

        return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
}

static __inline int
fo_truncate(fp, length, active_cred, td)
        struct file *fp;
        off_t length;
        struct ucred *active_cred;
        struct thread *td;
{

        return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, 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 */