1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)confstr.c 8.1 (Berkeley) 6/4/93 34 * $DragonFly: src/lib/libc/gen/confstr.c,v 1.5 2006/12/06 16:33:29 tgen Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/sysctl.h> 39 40 #include <errno.h> 41 #include <paths.h> 42 #include <stdlib.h> 43 #include <unistd.h> 44 #include <string.h> 45 46 size_t 47 confstr(int name, char *buf, size_t len) 48 { 49 size_t tlen; 50 int mib[2], sverrno; 51 char *p; 52 53 switch (name) { 54 case _CS_PATH: 55 mib[0] = CTL_USER; 56 mib[1] = USER_CS_PATH; 57 if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) 58 /* 59 * SUSv3 requires errors to return 0. 60 */ 61 return (0); 62 if (len != 0 && buf != NULL) { 63 if ((p = malloc(tlen)) == NULL) 64 return (0); /* SUSv3 */ 65 if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { 66 sverrno = errno; 67 free(p); 68 errno = sverrno; 69 return (0); /* SUSv3 */ 70 } 71 /* 72 * POSIX 1003.2 requires partial return of 73 * the string -- that should be *real* useful. 74 */ 75 strncpy(buf, p, len - 1); 76 buf[len - 1] = '\0'; 77 free(p); 78 } 79 return (tlen + 1); 80 default: 81 errno = EINVAL; 82 return (0); 83 } 84 /* NOTREACHED */ 85 } 86