1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate #include <sys/copyops.h> 30*7c478bd9Sstevel@tonic-gate #include <sys/errno.h> 31*7c478bd9Sstevel@tonic-gate #include <sys/kmem.h> 32*7c478bd9Sstevel@tonic-gate #include <sys/param.h> 33*7c478bd9Sstevel@tonic-gate #include <sys/pathname.h> 34*7c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 35*7c478bd9Sstevel@tonic-gate #include <sys/systm.h> 36*7c478bd9Sstevel@tonic-gate #include <sys/types.h> 37*7c478bd9Sstevel@tonic-gate #include <sys/vnode.h> 38*7c478bd9Sstevel@tonic-gate 39*7c478bd9Sstevel@tonic-gate int 40*7c478bd9Sstevel@tonic-gate getcwd(char *buf, size_t buflen) 41*7c478bd9Sstevel@tonic-gate { 42*7c478bd9Sstevel@tonic-gate int ret; 43*7c478bd9Sstevel@tonic-gate char *kbuf; 44*7c478bd9Sstevel@tonic-gate size_t kbuflen; 45*7c478bd9Sstevel@tonic-gate 46*7c478bd9Sstevel@tonic-gate /* 47*7c478bd9Sstevel@tonic-gate * The user should be able to specify any size buffer, but we don't want 48*7c478bd9Sstevel@tonic-gate * to arbitrarily allocate huge kernel buffers just because the user 49*7c478bd9Sstevel@tonic-gate * requests it. So we'll start with MAXPATHLEN (which should hold any 50*7c478bd9Sstevel@tonic-gate * normal path), and only increase it if we fail with ERANGE. 51*7c478bd9Sstevel@tonic-gate */ 52*7c478bd9Sstevel@tonic-gate kbuflen = MIN(buflen, MAXPATHLEN); 53*7c478bd9Sstevel@tonic-gate 54*7c478bd9Sstevel@tonic-gate for (;;) { 55*7c478bd9Sstevel@tonic-gate kbuf = kmem_alloc(kbuflen, KM_SLEEP); 56*7c478bd9Sstevel@tonic-gate 57*7c478bd9Sstevel@tonic-gate if ((ret = dogetcwd(kbuf, kbuflen)) == 0) 58*7c478bd9Sstevel@tonic-gate ret = copyout(kbuf, buf, strlen(kbuf) + 1); 59*7c478bd9Sstevel@tonic-gate 60*7c478bd9Sstevel@tonic-gate kmem_free(kbuf, kbuflen); 61*7c478bd9Sstevel@tonic-gate 62*7c478bd9Sstevel@tonic-gate if (ret == ENAMETOOLONG) { 63*7c478bd9Sstevel@tonic-gate /* 64*7c478bd9Sstevel@tonic-gate * If the user's buffer really was too small, give up. 65*7c478bd9Sstevel@tonic-gate * For some reason, getcwd() uses ERANGE for this case. 66*7c478bd9Sstevel@tonic-gate */ 67*7c478bd9Sstevel@tonic-gate if (kbuflen == buflen) { 68*7c478bd9Sstevel@tonic-gate ret = ERANGE; 69*7c478bd9Sstevel@tonic-gate break; 70*7c478bd9Sstevel@tonic-gate } 71*7c478bd9Sstevel@tonic-gate kbuflen = MIN(kbuflen * 2, buflen); 72*7c478bd9Sstevel@tonic-gate } else { 73*7c478bd9Sstevel@tonic-gate break; 74*7c478bd9Sstevel@tonic-gate } 75*7c478bd9Sstevel@tonic-gate } 76*7c478bd9Sstevel@tonic-gate 77*7c478bd9Sstevel@tonic-gate if (ret) 78*7c478bd9Sstevel@tonic-gate return (set_errno(ret)); 79*7c478bd9Sstevel@tonic-gate 80*7c478bd9Sstevel@tonic-gate return (ret); 81*7c478bd9Sstevel@tonic-gate } 82