NAME

       VOP_SETEXTATTR — set named extended attribute for a vnode

SYNOPSIS

       #include <sys/param.h>
       #include <sys/vnode.h>
       #include <sys/extattr.h>

       int
       VOP_SETEXTATTR(struct   vnode   *vp,   int   attrnamespace,   const   char   *name,   struct   uio  *uio,
           struct ucred *cred, struct thread *td);

DESCRIPTION

       This vnode call may be used to set specific named extended attribute for 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.

       name  Pointer to a null-terminated character string containing the attribute name.

       uio   The location of the data to be read or written.

       cred  The user credentials to use in authorizing the request.

       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_WRITE(9).  However,
       as extended attributes provide a strict "name=value" semantic, non-zero offsets will be rejected.

       The uio pointer may be NULL to indicate that the specified extended attribute should be deleted.

       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  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).

LOCKS

       The vnode will be locked on entry and should remain locked on return.

RETURN VALUES

       If  the  extended  attribute is successfully set, then zero is returned.  Otherwise, an appropriate error
       code is returned.

ERRORS

       [EACCES]           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]           Insufficient memory available to fulfill the request.

       [EFAULT]           The uio structure refers to an invalid userspace address.

       [EINVAL]           The name, namespace, or uio argument is invalid.

       [EOPNOTSUPP]       The file system does not support VOP_SETEXTATTR().

       [ENOSPC]           The file system is out of space.

       [EROFS]            The file system is read-only.

SEE ALSO

       extattr(9), vnode(9), VOP_GETEXTATTR(9), VOP_LISTEXTATTR(9)

AUTHORS

       This manual page was written by Robert Watson.

Debian                                          December 23, 1999                              VOP_SETEXTATTR(9)