1 /* $OpenBSD: confstr.c,v 1.8 2006/12/04 15:02:25 otto Exp $ */ 2 /*- 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 #include <sys/sysctl.h> 33 34 #include <errno.h> 35 #include <paths.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 40 size_t 41 confstr(int name, char *buf, size_t len) 42 { 43 size_t tlen; 44 int mib[2], sverrno; 45 char *p; 46 47 switch (name) { 48 case _CS_PATH: 49 mib[0] = CTL_USER; 50 mib[1] = USER_CS_PATH; 51 if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) 52 return (0); 53 if (len != 0 && buf != NULL) { 54 if ((p = malloc(tlen)) == NULL) 55 return (0); 56 if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { 57 sverrno = errno; 58 free(p); 59 errno = sverrno; 60 return (0); 61 } 62 /* 63 * POSIX 1003.2 requires partial return of 64 * the string -- that should be *real* useful. 65 */ 66 strlcpy(buf, p, len); 67 free(p); 68 } 69 return (tlen + 1); 70 default: 71 errno = EINVAL; 72 return (0); 73 } 74 /* NOTREACHED */ 75 } 76