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Man Pages


Manual Reference Pages  -  VOP_SETATTR (9)

NAME

VOP_GETATTR, VOP_SETATTR - get and set attributes on a file or directory

CONTENTS

Synopsis
Description
Locks
Return Values
Errors
See Also
Authors

SYNOPSIS


.In sys/param.h
.In sys/vnode.h int VOP_GETATTR struct vnode *vp struct vattr *vap struct ucred *cred int VOP_SETATTR struct vnode *vp struct vattr *vap struct ucred *cred

DESCRIPTION

These entry points manipulate various attributes of a file or directory, including file permissions, owner, group, size, access time and modification time.

The arguments are:
vp The vnode of the file.
vap The attributes of the file.
cred The user credentials of the calling process.

Attributes which are not being modified by VOP_SETATTR should be set to the value VNOVAL; VATTR_NULL may be used to clear all the values, and should generally be used to reset the contents of *vap prior to setting specific values.

LOCKS

VOP_GETATTR expects the vnode to be locked on entry and will leave the vnode locked on return. The lock type can be either shared or exclusive.

VOP_SETATTR expects the vnode to be locked on entry and will leave the vnode locked on return. The lock type must be exclusive.

RETURN VALUES

VOP_GETATTR returns 0 if it was able to retrieve the attribute data via *vap, otherwise an appropriate error is returned. VOP_SETATTR returns zero if the attributes were changed successfully, otherwise an appropriate error is returned.

ERRORS

[EPERM]
  The file is immutable.
[EACCES]
  The caller does not have permission to modify the file or directory attributes.
[EROFS]
  The file system is read-only.

SEE ALSO

VFS(9), vnode(9), VOP_ACCESS(9)

AUTHORS

This manual page was written by
.An Doug Rabson .
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