Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
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.Dd December 23, 1999 .Dt VOP_SETEXTATTR 9 .Os .Sh NAME .Nm VOP_SETEXTATTR .Nd set named extended attribute for a vnode .Sh SYNOPSIS n sys/param.h n sys/vnode.h n sys/extattr.h .Ft int .Fn VOP_SETEXTATTR "struct vnode *vp" "int attrnamespace" "const char *name" "struct uio *uio" "struct ucred *cred" "struct thread *td" .Sh DESCRIPTION This vnode call may be used to set specific named extended attribute for a file or directory.
p Its arguments are: l -tag -width type t Fa vp The vnode of the file or directory. t Fa attrnamespace Integer constant indicating which extended attribute namespace the attribute name is present in. t Fa name Pointer to a null-terminated character string containing the attribute name. t Fa uio The location of the data to be read or written. t Fa cred The user credentials to use in authorizing the request. t Fa td The thread setting the extended attribute. .El
p The uio structure is used in a manner similar to the argument of the same name in .Xr VOP_WRITE 9 . However, as extended attributes provide a strict "name=value" semantic, non-zero offsets will be rejected.
p The .Fa uio pointer may be .Dv NULL to indicate that the specified extended attribute should be deleted.
p The .Fa cred pointer may be .Dv NULL to indicate that access control checks are not to be performed, if possible. This .Fa cred setting might be used to allow the kernel to authorize extended attribute changes that the active process might not be permitted to make.
p Extended attribute semantics may vary by file system implementing the call. More information on extended attributes may be found in .Xr extattr 9 . .Sh LOCKS The vnode will be locked on entry and should remain locked on return. .Sh RETURN VALUES If the extended attribute is successfully set, then zero is returned. Otherwise, an appropriate error code is returned. .Sh ERRORS l -tag -width Er t Bq Er EACCES The caller does not have the appropriate privilege. t Bq Er ENXIO The request was not valid in this file system for the specified vnode and attribute name. t Bq Er ENOMEM Insufficient memory available to fulfill the request. t Bq Er EFAULT The uio structure refers to an invalid userspace address. t Bq Er EINVAL The name, namespace, or uio argument is invalid. t Bq Er EOPNOTSUPP The file system does not support .Fn VOP_SETEXTATTR . t Bq Er ENOSPC The file system is out of space. t Bq Er EROFS The file system is read-only. .El .Sh SEE ALSO .Xr extattr 9 , .Xr vnode 9 , .Xr VOP_GETEXTATTR 9 , .Xr VOP_LISTEXTATTR 9 .Sh AUTHORS This manual page was written by .An Robert Watson .