set named extended attribute for a vnode
This vnode call may be used to set specific named extended attribute for a file
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
- 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 name
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. This
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.
- The caller does not have the appropriate privilege.
- The request was not valid in this file system for the specified vnode and
- Insufficient memory available to fulfill the request.
- The uio structure refers to an invalid userspace address.
- The name, namespace, or uio argument is invalid.
- The file system does not support
- The file system is out of space.
- The file system is read-only.
This manual page was written by Robert