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NetBSD 6.1.5 - man page for vn_closefile (netbsd section 9)

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 descriptor 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 appro-
	      priate 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 operation VOP_FCNTL(9) with the command com and buffer data.  The
	      vnode is unlocked on return.  If the operation is successful zero is returned, oth-
	      erwise 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 memory to read into.  The caller's credentials are speci-
	      fied 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 specified 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 appropriate 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 memory to read from.  The caller's credentials are speci-
	      fied 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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