2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright 2020 Stefan Eßer <se@freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
15 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/sysctl.h>
33 #include <sys/limits.h>
39 #ifndef _PATH_LOCALBASE
40 #define _PATH_LOCALBASE "/usr/local"
46 static const int localbase_oid[2] = {CTL_USER, USER_LOCALBASE};
49 static const char *localbase = NULL;
51 if (issetugid() == 0) {
52 tmppath = getenv("LOCALBASE");
53 if (tmppath != NULL && tmppath[0] != '\0')
56 if (sysctl(localbase_oid, 2, NULL, &tmplen, NULL, 0) == 0 &&
57 (tmppath = malloc(tmplen)) != NULL &&
58 sysctl(localbase_oid, 2, tmppath, &tmplen, NULL, 0) == 0) {
60 * Check for some other thread already having
61 * set localbase - this should use atomic ops.
62 * The amount of memory allocated above may leak,
63 * if a parallel update in another thread is not
64 * detected and the non-NULL pointer is overwritten.
66 if (tmppath[0] != '\0' &&
67 (volatile const char*)localbase == NULL)
73 return (_PATH_LOCALBASE);