VOP_ATTRIB (9)

Leading comments

Copyright (c) 1996 Doug Rabson

All rights reserved.

This program is free software.

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modification, are permitted provided that the following conditions
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1. Redistributions of source code must retain the above copyright
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   notice, this list of conditions and the following disclaimer in...

(The comments found at the beginning of the groff file "man9/VOP_ATTRIB.9freebsd".)

NAME

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

SYNOPSIS

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

Fa vp

The vnode of the file.

Fa vap

The attributes of the file.

Fa cred

The user credentials of the calling process.

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

LOCKS

Fn 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.

Fn 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

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

ERRORS

Bq Er EPERM

The file is immutable.

Bq Er EACCES

The caller does not have permission to modify the file or directory attributes.

Bq Er EROFS

The file system is read-only.

SEE ALSO

VFS(9), vnode(9), VOP_ACCESS9

AUTHORS

This manual page was written by An Doug Rabson .