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https://github.com/freebsd/freebsd-src
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123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2006 The FreeBSD Project. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include <stdlib.h>
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#include "namespace.h"
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#include "reentrant.h"
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#include "un-namespace.h"
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#include "res_private.h"
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#undef _res
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struct __res_state _res;
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static thread_key_t res_key;
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static once_t res_init_once = ONCE_INITIALIZER;
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static int res_thr_keycreated = 0;
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static void
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free_res(void *ptr)
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{
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res_state statp = ptr;
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if (statp->_u._ext.ext != NULL)
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res_ndestroy(statp);
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free(statp);
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}
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static void
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res_keycreate(void)
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{
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res_thr_keycreated = thr_keycreate(&res_key, free_res) == 0;
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}
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static res_state
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res_check_reload(res_state statp)
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{
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struct timespec now;
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struct stat sb;
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struct __res_state_ext *ext;
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if ((statp->options & RES_INIT) == 0) {
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return (statp);
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}
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ext = statp->_u._ext.ext;
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if (ext == NULL || ext->reload_period == 0) {
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return (statp);
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}
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if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) != 0 ||
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(now.tv_sec - ext->conf_stat) < ext->reload_period) {
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return (statp);
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}
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ext->conf_stat = now.tv_sec;
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if (stat(_PATH_RESCONF, &sb) == 0 &&
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(sb.st_mtim.tv_sec != ext->conf_mtim.tv_sec ||
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sb.st_mtim.tv_nsec != ext->conf_mtim.tv_nsec)) {
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statp->options &= ~RES_INIT;
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}
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return (statp);
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}
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res_state
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__res_state(void)
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{
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res_state statp;
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if (thr_main() != 0)
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return res_check_reload(&_res);
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if (thr_once(&res_init_once, res_keycreate) != 0 ||
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!res_thr_keycreated)
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return (&_res);
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statp = thr_getspecific(res_key);
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if (statp != NULL)
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return res_check_reload(statp);
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statp = calloc(1, sizeof(*statp));
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if (statp == NULL)
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return (&_res);
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#ifdef __BIND_RES_TEXT
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statp->options = RES_TIMEOUT; /* Motorola, et al. */
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#endif
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if (thr_setspecific(res_key, statp) == 0)
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return (statp);
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free(statp);
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return (&_res);
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}
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