VOP_LISTEXTATTR -- retrieve a list of named extended attribute from a
VOP_LISTEXTATTR(struct vnode *vp, int attrnamespace, struct uio *uio,
size_t *size, struct ucred *cred, struct thread *td);
This vnode call may be used to retrieve a list of named extended
attributes from a specified namespace on a file or directory.
Its arguments are:
vp the vnode of the file or directory
attrnamespace integer constant indicating which extended attribute
namespace the attribute name is present in
uio the location of the data to be read
size if not NULL, on return it will contain the number of bytes
required to read the list. The resulting data will be a
ASCII nul-separted list of strings. In most cases uio
will be NULL when size is not, and vise versa.
cred the user credentials to use in authorizing the request
td the thread requesting the extended attribute
The cred pointer may be NULL to indicate that access control checks are
not to be performed, if possible. This cred setting might be used to
allow the kernel to authorize extended attribute retrieval that the
active process might not be permitted to do.
Extended attribute semantics may vary by file system implementing the
call. More information on extended attributes may be found in
The vnode will be locked on entry and should remain locked on return.
On success, zero will be returned, and the uio structure will be updated
to reflect the list read. Otherwise, an appropriate error code is
[EACCES] The the caller does not have the appropriate privilege.
[ENXIO] The request was not valid in this file system for the
specified vnode and attribute name.
[ENOMEM] Sufficient memory is not available to fulfill the
[EFAULT] The uio structure refers to an invalid userspace
[EINVAL] The namespace or uio argument is invalid.
[EOPNOTSUPP] The file system does not support VOP_LISTEXTATTR().
extattr(9), vnode(9), VOP_GETEXTATTR(9) VOP_SETEXTATTR(9)
FreeBSD 5.2.1 June 5, 2003 FreeBSD 5.2.1 [ Back ]