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 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)confstr.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/param.h> 39 #include <sys/sysctl.h> 40 41 #include <errno.h> 42 #include <paths.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 #include <string.h> 46 47 size_t 48 confstr(name, buf, len) 49 int name; 50 char *buf; 51 size_t len; 52 { 53 size_t tlen; 54 int mib[2], sverrno; 55 char *p; 56 57 switch (name) { 58 case _CS_PATH: 59 mib[0] = CTL_USER; 60 mib[1] = USER_CS_PATH; 61 if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) 62 return (-1); 63 if (len != 0 && buf != NULL) { 64 if ((p = malloc(tlen)) == NULL) 65 return (-1); 66 if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { 67 sverrno = errno; 68 free(p); 69 errno = sverrno; 70 return (-1); 71 } 72 /* 73 * POSIX 1003.2 requires partial return of 74 * the string -- that should be *real* useful. 75 */ 76 (void)strncpy(buf, p, len - 1); 77 buf[len - 1] = '\0'; 78 free(p); 79 } 80 return (tlen + 1); 81 default: 82 errno = EINVAL; 83 return (0); 84 } 85 /* NOTREACHED */ 86 } 87