1 .\" Copyright (c) 1996 Doug Rabson
3 .\" All rights reserved.
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27 .\" $FreeBSD: src/share/man/man9/VOP_ATTRIB.9,v 1.9.2.2 2001/12/17 11:30:18 ru Exp $
28 .\" $DragonFly: src/share/man/man9/VOP_ATTRIB.9,v 1.3 2004/06/01 11:36:53 hmp Exp $
36 .Nd get and set attributes on a file or directory
41 .Fn VOP_GETATTR "struct vnode *vp" "struct vattr *vap" "struct ucred *cred" "struct proc *p"
43 .Fn VOP_SETATTR "struct vnode *vp" "struct vattr *vap" "struct ucred *cred" "struct proc *p"
45 These entry points manipulate various attributes of a file or directory,
46 including file permissions, owner, group, size,
47 access time and modification time.
54 the attributes of the file
56 the user credentials of the calling process
61 Attributes which are not being modified by
63 should be set to the value
67 expects the vnode to be locked on entry and will leave the vnode locked on
71 expects the vnode to be locked on entry and will leave the vnode locked on
75 returns information about the file in
78 returns zero if the attributes were changed successfully, otherwise an
79 appropriate error is returned.
83 vop_getattr(struct vnode *vp, struct vattr *vap,
84 struct ucred *cred, struct proc *p)
87 * Fill in the contents of *vap with information from
96 vop_setattr(struct vnode *vp, struct vattr *vap,
97 struct ucred *cred, struct proc *p)
100 * Check for unsettable attributes.
102 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
103 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
104 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
105 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
109 if (vap->va_flags != VNOVAL) {
111 * Set the immutable and append flags of the file.
115 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
117 * Change owner and/or group of the file.
121 if (vap->va_size != VNOVAL) {
123 * Truncate the file to the specified size.
127 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
129 * Change access and/or modification time of file.
133 if (vap->va_mode != (mode_t)VNOVAL) {
135 * Change permissions of file.
145 The file is immutable
149 The filesystem is readonly
155 This man page was written by