[gssapi-openssh.git] / openssh / openbsd-compat / xmmap.c

/*
 * Copyright (c) 2002 Tim Rice.  All rights reserved.
 * MAP_FAILED code by Solar Designer.
 * 
 * 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 AUTHOR ``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 AUTHOR 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.
 */

/* $Id$ */

#include "includes.h"

#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#include "log.h"

void *xmmap(size_t size)
{
	void *address;

#ifdef HAVE_MMAP
# ifdef MAP_ANON
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
	    -1, 0);
# else
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
	    open("/dev/zero", O_RDWR), 0);
# endif

#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
	if (address == MAP_FAILED) {
		char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
		int tmpfd;

		tmpfd = mkstemp(tmpname);
		if (tmpfd == -1)
			fatal("mkstemp(\"%s\"): %s",
			    MM_SWAP_TEMPLATE, strerror(errno));
		unlink(tmpname);
		ftruncate(tmpfd, size);
		address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
		    tmpfd, 0);
		close(tmpfd);
	}

	return (address);
#else
	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	    __func__);
#endif /* HAVE_MMAP */

}
Commit	Line	Data
cc0583a1	1	/*
7cac2b65	2	* Copyright (c) 2002 Tim Rice. All rights reserved.
	3	* MAP_FAILED code by Solar Designer.
	4	*
cc0583a1	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
7cac2b65	26	/* $Id$ */
7cac2b65	27
cc0583a1	28	#include "includes.h"
	29
	30	#ifdef HAVE_SYS_MMAN_H
	31	#include <sys/mman.h>
	32	#endif
	33
	34	#include "log.h"
	35
	36	void *xmmap(size_t size)
	37	{
	38	void *address;
	39
	40	#ifdef HAVE_MMAP
	41	# ifdef MAP_ANON
	42	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_ANON\|MAP_SHARED,
	43	-1, 0);
	44	# else
	45	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
	46	open("/dev/zero", O_RDWR), 0);
	47	# endif
	48
	49	#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
	50	if (address == MAP_FAILED) {
	51	char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
	52	int tmpfd;
	53
	54	tmpfd = mkstemp(tmpname);
	55	if (tmpfd == -1)
	56	fatal("mkstemp(\"%s\"): %s",
	57	MM_SWAP_TEMPLATE, strerror(errno));
	58	unlink(tmpname);
	59	ftruncate(tmpfd, size);
	60	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
	61	tmpfd, 0);
	62	close(tmpfd);
	63	}
	64
	65	return (address);
	66	#else
	67	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	68	__func__);
	69	#endif /* HAVE_MMAP */
	70
	71	}
	72