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