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