Copyright (c) 1996 Doug Rabson
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$FreeBSD: releng/10.2/share/man/man9/VOP_ATTRIB.9 206622 2010-04-14 19:08:06Z uqs $
.Dd August 29, 2008 .Dt VOP_ATTRIB 9 .Os .Sh NAME .Nm VOP_GETATTR , .Nm VOP_SETATTR .Nd get and set attributes on a file or directory .Sh SYNOPSIS n sys/param.h n 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" .Sh DESCRIPTION These entry points manipulate various attributes of a file or directory, including file permissions, owner, group, size, access time and modification time.
p The arguments are: l -tag -width cred t Fa vp The vnode of the file. t Fa vap The attributes of the file. t Fa cred The user credentials of the calling process. .El
p Attributes which are not being modified by .Fn VOP_SETATTR should be set to the value .Dv 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. .Sh 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.
p .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. .Sh 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. .Sh ERRORS l -tag -width Er t Bq Er EPERM The file is immutable. t Bq Er EACCES The caller does not have permission to modify the file or directory attributes. t Bq Er EROFS The file system is read-only. .El .Sh SEE ALSO .Xr VFS 9 , .Xr vnode 9 , .Xr VOP_ACCESS 9 .Sh AUTHORS This manual page was written by .An Doug Rabson .