17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 57c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 67c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 77c478bd9Sstevel@tonic-gate * with the License. 87c478bd9Sstevel@tonic-gate * 97c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 107c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 117c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 127c478bd9Sstevel@tonic-gate * and limitations under the License. 137c478bd9Sstevel@tonic-gate * 147c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 157c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 167c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 177c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 187c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 197c478bd9Sstevel@tonic-gate * 207c478bd9Sstevel@tonic-gate * CDDL HEADER END 217c478bd9Sstevel@tonic-gate */ 227c478bd9Sstevel@tonic-gate /* 23*9a34c4c9Skucharsk * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 277c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate #include <sys/copyops.h> 307c478bd9Sstevel@tonic-gate #include <sys/errno.h> 317c478bd9Sstevel@tonic-gate #include <sys/kmem.h> 327c478bd9Sstevel@tonic-gate #include <sys/param.h> 337c478bd9Sstevel@tonic-gate #include <sys/pathname.h> 347c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 357c478bd9Sstevel@tonic-gate #include <sys/systm.h> 367c478bd9Sstevel@tonic-gate #include <sys/types.h> 377c478bd9Sstevel@tonic-gate #include <sys/vnode.h> 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate int 407c478bd9Sstevel@tonic-gate getcwd(char *buf, size_t buflen) 417c478bd9Sstevel@tonic-gate { 42*9a34c4c9Skucharsk int err; 437c478bd9Sstevel@tonic-gate char *kbuf; 447c478bd9Sstevel@tonic-gate size_t kbuflen; 457c478bd9Sstevel@tonic-gate 467c478bd9Sstevel@tonic-gate /* 477c478bd9Sstevel@tonic-gate * The user should be able to specify any size buffer, but we don't want 487c478bd9Sstevel@tonic-gate * to arbitrarily allocate huge kernel buffers just because the user 497c478bd9Sstevel@tonic-gate * requests it. So we'll start with MAXPATHLEN (which should hold any 507c478bd9Sstevel@tonic-gate * normal path), and only increase it if we fail with ERANGE. 517c478bd9Sstevel@tonic-gate */ 527c478bd9Sstevel@tonic-gate kbuflen = MIN(buflen, MAXPATHLEN); 537c478bd9Sstevel@tonic-gate 547c478bd9Sstevel@tonic-gate for (;;) { 557c478bd9Sstevel@tonic-gate kbuf = kmem_alloc(kbuflen, KM_SLEEP); 567c478bd9Sstevel@tonic-gate 57*9a34c4c9Skucharsk if (((err = dogetcwd(kbuf, kbuflen)) == 0) && 58*9a34c4c9Skucharsk (copyout(kbuf, buf, strlen(kbuf) + 1) != 0)) 59*9a34c4c9Skucharsk err = EFAULT; 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate kmem_free(kbuf, kbuflen); 627c478bd9Sstevel@tonic-gate 63*9a34c4c9Skucharsk if (err == ENAMETOOLONG) { 647c478bd9Sstevel@tonic-gate /* 657c478bd9Sstevel@tonic-gate * If the user's buffer really was too small, give up. 667c478bd9Sstevel@tonic-gate * For some reason, getcwd() uses ERANGE for this case. 677c478bd9Sstevel@tonic-gate */ 687c478bd9Sstevel@tonic-gate if (kbuflen == buflen) { 69*9a34c4c9Skucharsk err = ERANGE; 707c478bd9Sstevel@tonic-gate break; 717c478bd9Sstevel@tonic-gate } 727c478bd9Sstevel@tonic-gate kbuflen = MIN(kbuflen * 2, buflen); 737c478bd9Sstevel@tonic-gate } else { 747c478bd9Sstevel@tonic-gate break; 757c478bd9Sstevel@tonic-gate } 767c478bd9Sstevel@tonic-gate } 777c478bd9Sstevel@tonic-gate 78*9a34c4c9Skucharsk return ((err != 0) ? set_errno(err) : 0); 797c478bd9Sstevel@tonic-gate } 80