1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * Portions of this source code were derived from Berkeley 4.3 BSD 31 * under license from the Regents of the University of California. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/isa_defs.h> 36 #include <sys/types.h> 37 #include <sys/sysmacros.h> 38 #include <sys/systm.h> 39 #include <sys/errno.h> 40 #include <sys/vnode.h> 41 #include <sys/file.h> 42 #include <sys/fcntl.h> 43 #include <sys/uio.h> 44 #include <sys/debug.h> 45 #include <c2/audit.h> 46 47 /* 48 * Make a hard link. 49 */ 50 int 51 linkat(int ffd, char *from, int tfd, char *to, int flag) 52 { 53 vnode_t *fstartvp = NULL; 54 vnode_t *tstartvp = NULL; 55 enum symfollow follow; 56 int error; 57 58 if (flag & ~AT_SYMLINK_FOLLOW) 59 return (set_errno(EINVAL)); 60 follow = (flag & AT_SYMLINK_FOLLOW)? FOLLOW : NO_FOLLOW; 61 62 if (from == NULL || to == NULL) 63 return (set_errno(EFAULT)); 64 if ((error = fgetstartvp(ffd, from, &fstartvp)) != 0) 65 goto out; 66 if ((error = fgetstartvp(tfd, to, &tstartvp)) != 0) 67 goto out; 68 69 error = vn_linkat(fstartvp, from, follow, tstartvp, to, UIO_USERSPACE); 70 71 out: 72 if (fstartvp != NULL) 73 VN_RELE(fstartvp); 74 if (tstartvp != NULL) 75 VN_RELE(tstartvp); 76 if (error) 77 return (set_errno(error)); 78 return (0); 79 } 80 81 int 82 link(char *from, char *to) 83 { 84 return (linkat(AT_FDCWD, from, AT_FDCWD, to, 0)); 85 } 86