VOP_SETEXTATTR(9)

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 the caller does not have the appropriate privi-
			lege.

     [ENXIO]		The request was not valid in this file system for the
			specified vnode and attribute name.

     [ENOMEM]		Insufficient memory available to fulfill 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 man page was written by Robert Watson.