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/*
* 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: xmmap.c,v 1.15 2009/02/16 04:21:40 djm Exp $ */
#include "includes.h"
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
void *
xmmap(size_t size)
{
#ifdef HAVE_MMAP
void *address;
# ifdef MAP_ANON
address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
-1, (off_t)0);
# else
address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
open("/dev/zero", O_RDWR), (off_t)0);
# endif
#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
if (address == (void *)MAP_FAILED) {
char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
int tmpfd;
mode_t old_umask;
old_umask = umask(0177);
tmpfd = mkstemp(tmpname);
umask(old_umask);
if (tmpfd == -1)
fatal("mkstemp(\"%s\"): %s",
MM_SWAP_TEMPLATE, strerror(errno));
unlink(tmpname);
if (ftruncate(tmpfd, size) != 0)
fatal("%s: ftruncate: %s", __func__, strerror(errno));
address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
tmpfd, (off_t)0);
close(tmpfd);
}
return (address);
#else
fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
__func__);
#endif /* HAVE_MMAP */
}
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