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VNFILEOPS(9)		 BSD Kernel Developer's Manual		  VNFILEOPS(9)

NAME
     vnfileops, vn_closefile, vn_fcntl, vn_ioctl, vn_read, vn_poll,
     vn_statfile, vn_write — vnode file descriptor operations

SYNOPSIS
     #include <sys/param.h>
     #include <sys/file.h>
     #include <sys/vnode.h>

     int
     vn_closefile(file_t *fp);

     int
     vn_fcntl(file_t *fp, u_int com, void *data);

     int
     vn_ioctl(file_t *fp, u_long com, void *data);

     int
     vn_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
	 int flags);

     int
     vn_poll(file_t *fp, int events);

     int
     vn_statfile(file_t *fp, struct stat *sb);

     int
     vn_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
	 int flags);

DESCRIPTION
     The functions described in this page are the vnode-specific file descrip‐
     tor operations.  They should only be accessed through the opaque function
     pointers in the file entries (see file(9)).  They are described here only
     for completeness.

FUNCTIONS
     vn_closefile(fp, l)
	      Common code for a file table vnode close operation.  The file is
	      described by fp and l is the calling lwp.	 vn_closefile() simply
	      calls vn_close(9) with the appropriate arguments.

     vn_fcntl(fp, com, data, l)
	      Common code for a file table vnode fcntl(2) operation.  The file
	      is specified by fp.  The argument l is the calling lwp.
	      vn_fcntl() simply locks the vnode and invokes the vnode opera‐
	      tion VOP_FCNTL(9) with the command com and buffer data.  The
	      vnode is unlocked on return.  If the operation is successful
	      zero is returned, otherwise an appropriate error is returned.

     vn_ioctl(fp, com, data, l)
	      Common code for a file table vnode ioctl operation.  The file is
	      specified by fp.	The argument l is the calling lwp vn_ioctl()
	      simply locks the vnode and invokes the vnode operation
	      VOP_IOCTL(9) with the command com and buffer data.  The vnode is
	      unlocked on return.  If the operation is successful zero is
	      returned, otherwise an appropriate error is returned.

     vn_read(fp, offset, uio, cred, flags)
	      Common code for a file table vnode read.	The argument fp is the
	      file structure,  The argument offset is the offset into the
	      file.  The argument uio is the uio structure describing the mem‐
	      ory to read into.	 The caller's credentials are specified in
	      cred.  The flags argument can define FOF_UPDATE_OFFSET to update
	      the read position in the file.  If the operation is successful
	      zero is returned, otherwise an appropriate error is returned.

     vn_poll(fp, events, l)
	      Common code for a file table vnode poll operation.  vn_poll()
	      simply calls VOP_POLL(9) with the events events and the calling
	      lwp l.  The function returns a bitmask of available events.

     vn_statfile(fp, sb, l)
	      Common code for a stat operation.	 The file descriptor is speci‐
	      fied by the argument fp and sb is the buffer to return the stat
	      information.  The argument l is the calling lwp.	vn_statfile()
	      basically calls the vnode operation VOP_GETATTR(9) and transfer
	      the contents of a vattr structure into a struct stat.  If the
	      operation is successful zero is returned, otherwise an appropri‐
	      ate error code is returned.

     vn_write(fp, offset, uio, cred, flags)
	      Common code for a file table vnode write.	 The argument fp is
	      the file structure,  The argument offset is the offset into the
	      file.  The argument uio is the uio structure describing the mem‐
	      ory to read from.	 The caller's credentials are specified in
	      cred.  The flags argument can define FOF_UPDATE_OFFSET to update
	      the read position in the file.  If the operation is successful
	      zero is returned, otherwise an appropriate error is returned.

CODE REFERENCES
     The high-level convenience functions are implemented within the file
     sys/kern/vfs_vnops.c.

SEE ALSO
     file(9), intro(9), vnode(9), vnodeops(9), vnsubr(9)

BSD				 April 9, 2008				   BSD
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