/* $NetBSD: confstr.c,v 1.13 2012/06/25 22:32:43 abs Exp $ */ /*- * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)confstr.c 8.1 (Berkeley) 6/4/93"; #else __RCSID("$NetBSD: confstr.c,v 1.13 2012/06/25 22:32:43 abs Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include <sys/param.h> #include <sys/sysctl.h> #include <errno.h> #include <paths.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #ifdef __weak_alias __weak_alias(confstr,_confstr) #endif size_t confstr(int name, char *buf, size_t len) { size_t tlen; int mib[2], sverrno; char *p; /* * POSIX 1003.2 requires errors to return 0 -- * that is *really* useful. */ switch (name) { case _CS_PATH: mib[0] = CTL_USER; mib[1] = USER_CS_PATH; if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) return 0; if (len != 0 && buf != NULL) { if ((p = malloc(tlen)) == NULL) return 0; if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { sverrno = errno; free(p); errno = sverrno; return 0; } /* * POSIX 1003.2 requires partial return of * the string -- that is even more useful. */ (void)strncpy(buf, p, len - 1); buf[len - 1] = '\0'; free(p); } return tlen + 1; default: errno = EINVAL; return 0; } /* NOTREACHED */ } |