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head/lib/libutil/getlocalbase.c
Property | Old Value | New Value |
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svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause | |||||
* | |||||
* Copyright 2020 Stefan Eßer <se@freebsd.org> | |||||
* | |||||
* 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. | |||||
* | |||||
* 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> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/param.h> | |||||
#include <sys/sysctl.h> | |||||
#include <sys/limits.h> | |||||
#include <stdlib.h> | |||||
#include <paths.h> | |||||
#include <libutil.h> | |||||
#include <unistd.h> | |||||
#ifndef _PATH_LOCALBASE | |||||
#define _PATH_LOCALBASE "/usr/local" | |||||
#endif | |||||
const char * | |||||
getlocalbase(void) | |||||
{ | |||||
static const int localbase_oid[2] = {CTL_USER, USER_LOCALBASE}; | |||||
char *tmppath; | |||||
size_t tmplen; | |||||
static const char *localbase = NULL; | |||||
if (issetugid() == 0) { | |||||
tmppath = getenv("LOCALBASE"); | |||||
if (tmppath != NULL && tmppath[0] != '\0') | |||||
return (tmppath); | |||||
} | |||||
if (sysctl(localbase_oid, 2, NULL, &tmplen, NULL, 0) == 0 && | |||||
(tmppath = malloc(tmplen)) != NULL && | |||||
sysctl(localbase_oid, 2, tmppath, &tmplen, NULL, 0) == 0) { | |||||
/* | |||||
* Check for some other thread already having | |||||
* set localbase - this should use atomic ops. | |||||
* The amount of memory allocated above may leak, | |||||
* if a parallel update in another thread is not | |||||
* detected and the non-NULL pointer is overwritten. | |||||
*/ | |||||
if (tmppath[0] != '\0' && | |||||
(volatile const char*)localbase == NULL) | |||||
localbase = tmppath; | |||||
else | |||||
free((void*)tmppath); | |||||
return (localbase); | |||||
} | |||||
return (_PATH_LOCALBASE); | |||||
} |