1/*
2 * Copyright (c) 2002 Tim Rice. All rights reserved.
3 * MAP_FAILED code by Solar Designer.
4 *
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

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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
26/* $Id: xmmap.c,v 1.3 2003/06/02 02:25:27 tim Exp $ */
27
28#include "includes.h"
29
30#ifdef HAVE_SYS_MMAN_H
31#include <sys/mman.h>
32#endif
33
34#include "log.h"
35
36void *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