res_internal.h
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上传日期:2007-04-14
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- /*
- * Copyright (c) 1985 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- /*static char *sccsid = "from: @(#)res_internal.h 6.22 (Berkeley) 3/19/91";*/
- static char *rcsid = "$Id$";
- #endif /* LIBC_SCCS and not lint */
- #ifndef _RES_INTERNAL_H
- #define _RES_INTERNAL_H
- #include <pthread.h>
- #include <netdb.h>
- #include <resolv.h>
- #define HOST_BUFSIZE 4096
- #undef ALIGN
- #define ALIGN(p, t) ((char *)(((((long)(p) - 1) / sizeof(t)) + 1) * sizeof(t)))
- #define SP(p, t, n) (ALIGN(p, t) + (n) * sizeof(t))
- struct res_data {
- char *buf;
- struct __res_state state;
- int errval;
- int sock;
- };
- #if PACKETSZ > 1024
- #define MAXPACKET PACKETSZ
- #else
- #define MAXPACKET 1024
- #endif
- typedef union {
- HEADER hdr;
- unsigned char buf[MAXPACKET];
- } querybuf;
- typedef union {
- long al;
- char ac;
- } align;
- extern pthread_mutex_t host_iterate_lock;
- __BEGIN_DECLS
- struct hostent *_res_parse_answer(querybuf *answer, int anslen, int iquery,
- struct hostent *result, char *buf,
- int buflen, int *errval);
- void _res_set_error(int val);
- struct res_data *_res_init(void);
- __END_DECLS
- #endif