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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: confstr.c,v 1.6 2003/06/11 21:03:10 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/param.h> 35 #include <sys/sysctl.h> 36 37 #include <errno.h> 38 #include <paths.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 size_t 44 confstr(int name, char *buf, size_t len) 45 { 46 size_t tlen; 47 int mib[2], sverrno; 48 char *p; 49 50 switch (name) { 51 case _CS_PATH: 52 mib[0] = CTL_USER; 53 mib[1] = USER_CS_PATH; 54 if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) 55 return ((size_t) -1); 56 if (len != 0 && buf != NULL) { 57 if ((p = malloc(tlen)) == NULL) 58 return ((size_t) -1); 59 if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { 60 sverrno = errno; 61 free(p); 62 errno = sverrno; 63 return ((size_t) -1); 64 } 65 /* 66 * POSIX 1003.2 requires partial return of 67 * the string -- that should be *real* useful. 68 */ 69 strlcpy(buf, p, len); 70 free(p); 71 } 72 return (tlen + 1); 73 default: 74 errno = EINVAL; 75 return (0); 76 } 77 /* NOTREACHED */ 78 } 79