- Copyright (c) 1999, 2000, 2001 Robert N. M. Watson All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the...
NAMEVOP_SETEXTATTR - set named extended attribute for a vnode
SYNOPSISIn sys/param.h In sys/vnode.h In sys/extattr.h Ft int Fn VOP_SETEXTATTR struct vnode *vp int attrnamespace const char *name struct uio *uio struct ucred *cred struct thread *td
DESCRIPTIONThis vnode call may be used to set specific named extended attribute for a file or directory.
Its arguments are:
- Fa vp
- The vnode of the file or directory.
- Fa attrnamespace
- Integer constant indicating which extended attribute namespace the attribute name is present in.
- Fa name
- Pointer to a null-terminated character string containing the attribute name.
- Fa uio
- The location of the data to be read or written.
- Fa cred
- The user credentials to use in authorizing the request.
- Fa td
- The thread setting the extended attribute.
The uio structure is used in a manner similar to the argument of the same name in VOP_WRITE9. However, as extended attributes provide a strict "name=value" semantic, non-zero offsets will be rejected.
The Fa uio pointer may be NULL to indicate that the specified extended attribute should be deleted.
The Fa cred pointer may be NULL to indicate that access control checks are not to be performed, if possible. This Fa cred setting might be used to allow the kernel to authorize extended attribute changes that the active process might not be permitted to make.
Extended attribute semantics may vary by file system implementing the call. More information on extended attributes may be found in extattr(9).
LOCKSThe vnode will be locked on entry and should remain locked on return.
RETURN VALUESIf the extended attribute is successfully set, then zero is returned. Otherwise, an appropriate error code is returned.
- Bq Er EACCES
- The caller does not have the appropriate privilege.
- Bq Er ENXIO
- The request was not valid in this file system for the specified vnode and attribute name.
- Bq Er ENOMEM
- Insufficient memory available to fulfill the request.
- Bq Er EFAULT
- The uio structure refers to an invalid userspace address.
- Bq Er EINVAL
- The name, namespace, or uio argument is invalid.
- Bq Er EOPNOTSUPP
- The file system does not support Fn VOP_SETEXTATTR .
- Bq Er ENOSPC
- The file system is out of space.
- Bq Er EROFS
- The file system is read-only.