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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/*
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* Copyright (c) 2002 Tim Rice. All rights reserved.
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* MAP_FAILED code by Solar Designer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* $Id: xmmap.c,v 1.6 2004/10/06 13:15:44 dtucker Exp $ */
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#include "includes.h"
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include "log.h"
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void *xmmap(size_t size)
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{
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void *address;
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#ifdef HAVE_MMAP
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# ifdef MAP_ANON
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address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
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-1, (off_t)0);
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# else
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address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
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open("/dev/zero", O_RDWR), (off_t)0);
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# endif
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#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
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if (address == (void *)MAP_FAILED) {
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char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
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int tmpfd;
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mode_t old_umask;
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old_umask = umask(0177);
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tmpfd = mkstemp(tmpname);
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umask(old_umask);
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if (tmpfd == -1)
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fatal("mkstemp(\"%s\"): %s",
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MM_SWAP_TEMPLATE, strerror(errno));
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unlink(tmpname);
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ftruncate(tmpfd, size);
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address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
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tmpfd, (off_t)0);
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close(tmpfd);
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}
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return (address);
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#else
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fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
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__func__);
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#endif /* HAVE_MMAP */
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}
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