confstr.c revision 1573
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 321573Srgrimes */ 331573Srgrimes 341573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 351573Srgrimesstatic char sccsid[] = "@(#)confstr.c 8.1 (Berkeley) 6/4/93"; 361573Srgrimes#endif /* LIBC_SCCS and not lint */ 371573Srgrimes 381573Srgrimes#include <sys/param.h> 391573Srgrimes#include <sys/sysctl.h> 401573Srgrimes 411573Srgrimes#include <errno.h> 421573Srgrimes#include <paths.h> 431573Srgrimes#include <stdlib.h> 441573Srgrimes#include <unistd.h> 451573Srgrimes 461573Srgrimessize_t 471573Srgrimesconfstr(name, buf, len) 481573Srgrimes int name; 491573Srgrimes char *buf; 501573Srgrimes size_t len; 511573Srgrimes{ 521573Srgrimes size_t tlen; 531573Srgrimes int mib[2], sverrno; 541573Srgrimes char *p; 551573Srgrimes 561573Srgrimes switch (name) { 571573Srgrimes case _CS_PATH: 581573Srgrimes mib[0] = CTL_USER; 591573Srgrimes mib[1] = USER_CS_PATH; 601573Srgrimes if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) 611573Srgrimes return (-1); 621573Srgrimes if (len != 0 && buf != NULL) { 631573Srgrimes if ((p = malloc(tlen)) == NULL) 641573Srgrimes return (-1); 651573Srgrimes if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { 661573Srgrimes sverrno = errno; 671573Srgrimes free(p); 681573Srgrimes errno = sverrno; 691573Srgrimes return (-1); 701573Srgrimes } 711573Srgrimes /* 721573Srgrimes * POSIX 1003.2 requires partial return of 731573Srgrimes * the string -- that should be *real* useful. 741573Srgrimes */ 751573Srgrimes (void)strncpy(buf, p, len - 1); 761573Srgrimes buf[len - 1] = '\0'; 771573Srgrimes free(p); 781573Srgrimes } 791573Srgrimes return (tlen + 1); 801573Srgrimes default: 811573Srgrimes errno = EINVAL; 821573Srgrimes return (0); 831573Srgrimes } 841573Srgrimes /* NOTREACHED */ 851573Srgrimes} 86