This vnode call may be used to set specific named extended attribute for a
file or directory.
Its arguments are:
The vnode of the file or directory.
Integer constant indicating which extended attribute namespace the attribute
name is present in.
Pointer to a null-terminated character string containing the attribute name.
The location of the data to be read or written.
The user credentials to use in authorizing the request.
The thread setting the extended attribute.
The uio structure is used in a manner similar to the argument of the same
However, as extended attributes provide a strict "name=value" semantic,
non-zero offsets will be rejected.
pointer may be
to indicate that the specified extended attribute should be deleted.
pointer may be
to indicate that access control checks are not to be performed, if possible.
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
The vnode will be locked on entry and should remain locked on return.
If the extended attribute is successfully set, then zero is returned.
Otherwise, an appropriate error code is returned.
Bq Er EACCES
The 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
Bq Er ENOMEM
Insufficient memory available to fulfill 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