confstr.c revision 92986
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 */ 3792986Sobrien#include <sys/cdefs.h> 3892986Sobrien__FBSDID("$FreeBSD: head/lib/libc/gen/confstr.c 92986 2002-03-22 21:53:29Z obrien $"); 391573Srgrimes 401573Srgrimes#include <sys/param.h> 411573Srgrimes#include <sys/sysctl.h> 421573Srgrimes 431573Srgrimes#include <errno.h> 441573Srgrimes#include <paths.h> 451573Srgrimes#include <stdlib.h> 461573Srgrimes#include <unistd.h> 4711659Sphk#include <string.h> 481573Srgrimes 491573Srgrimessize_t 501573Srgrimesconfstr(name, buf, len) 511573Srgrimes int name; 521573Srgrimes char *buf; 531573Srgrimes size_t len; 541573Srgrimes{ 551573Srgrimes size_t tlen; 561573Srgrimes int mib[2], sverrno; 571573Srgrimes char *p; 581573Srgrimes 591573Srgrimes switch (name) { 601573Srgrimes case _CS_PATH: 611573Srgrimes mib[0] = CTL_USER; 621573Srgrimes mib[1] = USER_CS_PATH; 631573Srgrimes if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) 641573Srgrimes return (-1); 651573Srgrimes if (len != 0 && buf != NULL) { 661573Srgrimes if ((p = malloc(tlen)) == NULL) 671573Srgrimes return (-1); 681573Srgrimes if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { 691573Srgrimes sverrno = errno; 701573Srgrimes free(p); 711573Srgrimes errno = sverrno; 721573Srgrimes return (-1); 731573Srgrimes } 741573Srgrimes /* 751573Srgrimes * POSIX 1003.2 requires partial return of 761573Srgrimes * the string -- that should be *real* useful. 771573Srgrimes */ 781573Srgrimes (void)strncpy(buf, p, len - 1); 791573Srgrimes buf[len - 1] = '\0'; 801573Srgrimes free(p); 811573Srgrimes } 821573Srgrimes return (tlen + 1); 831573Srgrimes default: 841573Srgrimes errno = EINVAL; 851573Srgrimes return (0); 861573Srgrimes } 871573Srgrimes /* NOTREACHED */ 881573Srgrimes} 89