1 /* $NetBSD: vfs_syscalls_12.c,v 1.17 2005/12/11 12:19:56 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * From: @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_12.c,v 1.17 2005/12/11 12:19:56 christos Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/namei.h> 45 #include <sys/filedesc.h> 46 #include <sys/kernel.h> 47 #include <sys/file.h> 48 #include <sys/stat.h> 49 #include <sys/socketvar.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/proc.h> 53 #include <sys/uio.h> 54 #include <sys/dirent.h> 55 56 #include <sys/sa.h> 57 #include <sys/syscallargs.h> 58 59 #include <compat/sys/stat.h> 60 61 static void cvtstat __P((struct stat *, struct stat12 *)); 62 63 /* 64 * Convert from a new to an old stat structure. 65 */ 66 static void 67 cvtstat(st, ost) 68 struct stat *st; 69 struct stat12 *ost; 70 { 71 72 ost->st_dev = st->st_dev; 73 ost->st_ino = st->st_ino; 74 ost->st_mode = st->st_mode & 0xffff; 75 if (st->st_nlink >= (1 << 15)) 76 ost->st_nlink = (1 << 15) - 1; 77 else 78 ost->st_nlink = st->st_nlink; 79 ost->st_uid = st->st_uid; 80 ost->st_gid = st->st_gid; 81 ost->st_rdev = st->st_rdev; 82 ost->st_atimespec = st->st_atimespec; 83 ost->st_mtimespec = st->st_mtimespec; 84 ost->st_ctimespec = st->st_ctimespec; 85 ost->st_size = st->st_size; 86 ost->st_blocks = st->st_blocks; 87 ost->st_blksize = st->st_blksize; 88 ost->st_flags = st->st_flags; 89 ost->st_gen = st->st_gen; 90 } 91 92 /* 93 * Read a block of directory entries in a file system independent format. 94 */ 95 int 96 compat_12_sys_getdirentries(struct lwp *l, void *v, register_t *retval) 97 { 98 struct compat_12_sys_getdirentries_args /* { 99 syscallarg(int) fd; 100 syscallarg(char *) buf; 101 syscallarg(u_int) count; 102 syscallarg(long *) basep; 103 } */ *uap = v; 104 struct proc *p = l->l_proc; 105 struct file *fp; 106 int error, done; 107 long loff; 108 109 /* getvnode() will use the descriptor for us */ 110 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 111 return error; 112 if ((fp->f_flag & FREAD) == 0) { 113 error = EBADF; 114 goto out; 115 } 116 117 loff = fp->f_offset; 118 119 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 120 SCARG(uap, count), &done, l, 0, 0); 121 122 error = copyout(&loff, SCARG(uap, basep), sizeof(long)); 123 *retval = done; 124 out: 125 FILE_UNUSE(fp, l); 126 return error; 127 } 128 129 /* 130 * Get file status; this version follows links. 131 */ 132 /* ARGSUSED */ 133 int 134 compat_12_sys_stat(struct lwp *l, void *v, register_t *retval) 135 { 136 struct compat_12_sys_stat_args /* { 137 syscallarg(const char *) path; 138 syscallarg(struct stat12 *) ub; 139 } */ *uap = v; 140 struct stat sb; 141 struct stat12 osb; 142 int error; 143 struct nameidata nd; 144 145 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 146 SCARG(uap, path), l); 147 if ((error = namei(&nd)) != 0) 148 return (error); 149 error = vn_stat(nd.ni_vp, &sb, l); 150 vput(nd.ni_vp); 151 if (error) 152 return (error); 153 cvtstat(&sb, &osb); 154 error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); 155 return (error); 156 } 157 158 159 /* 160 * Get file status; this version does not follow links. 161 */ 162 /* ARGSUSED */ 163 int 164 compat_12_sys_lstat(struct lwp *l, void *v, register_t *retval) 165 { 166 struct compat_12_sys_lstat_args /* { 167 syscallarg(const char *) path; 168 syscallarg(struct stat12 *) ub; 169 } */ *uap = v; 170 struct stat sb; 171 struct stat12 osb; 172 int error; 173 struct nameidata nd; 174 175 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 176 SCARG(uap, path), l); 177 if ((error = namei(&nd)) != 0) 178 return (error); 179 error = vn_stat(nd.ni_vp, &sb, l); 180 vput(nd.ni_vp); 181 if (error) 182 return (error); 183 cvtstat(&sb, &osb); 184 error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); 185 return (error); 186 } 187 188 /* 189 * Return status information about a file descriptor. 190 */ 191 /* ARGSUSED */ 192 int 193 compat_12_sys_fstat(struct lwp *l, void *v, register_t *retval) 194 { 195 struct compat_12_sys_fstat_args /* { 196 syscallarg(int) fd; 197 syscallarg(struct stat12 *) sb; 198 } */ *uap = v; 199 struct proc *p = l->l_proc; 200 int fd = SCARG(uap, fd); 201 struct filedesc *fdp = p->p_fd; 202 struct file *fp; 203 struct stat ub; 204 struct stat12 oub; 205 int error; 206 207 if ((fp = fd_getfile(fdp, fd)) == NULL) 208 return (EBADF); 209 210 FILE_USE(fp); 211 error = (*fp->f_ops->fo_stat)(fp, &ub, l); 212 FILE_UNUSE(fp, l); 213 214 if (error == 0) { 215 cvtstat(&ub, &oub); 216 error = copyout(&oub, SCARG(uap, sb), sizeof (oub)); 217 } 218 return (error); 219 } 220