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Manual Pages  — VOP_RDWR


VOP_READ, VOP_WRITE – read or write a file



#include <sys/param.h>
#include <sys/vnode.h>
#include <sys/uio.h>

VOP_READ(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred);

VOP_WRITE(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred);


These entry points read or write the contents of a file.

The arguments are:
  The vnode of the file.
  The location of the data to be read or written.
  Various flags.
  The credentials of the caller.

The ioflag argument is used to give directives and hints to the file system. When attempting a read, the high 16 bits are used to provide a read-ahead hint (in units of file system blocks) that the file system should attempt. The low 16 bits are a bit mask which can contain the following flags:
IO_UNIT Do I/O as atomic unit.
IO_APPEND Append write to end.
IO_SYNC Do I/O synchronously.
  Underlying node already locked.
IO_NDELAY FNDELAY flag set in file table.
IO_VMIO Data already in VMIO space.


The file should be locked on entry and will still be locked on exit.


Zero is returned on success, otherwise an error code is returned.


  An attempt was made to write a file that exceeds the process's file size limit or the maximum file size.
  The file system is full.
  An append-only flag is set on the file, but the caller is attempting to write before the current end of file.


uiomove(9), vnode(9)


This manual page was written by Doug Rabson.

VOP_RDWR (9) July 24, 1996

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