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97 lines
1.6 KiB
C
97 lines
1.6 KiB
C
// Copyright (c) 2000-2011 by Digital Mars
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// All Rights Reserved
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// written by Walter Bright
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// http://www.digitalmars.com
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// License for redistribution is by either the Artistic License
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// in artistic.txt, or the GNU General Public License in gnu.txt.
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// See the included readme.txt for details.
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#include <unistd.h>
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#include <errno.h>
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#include <sys/mman.h>
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/*************************************
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* This is all necessary to get fd initialized at startup.
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*/
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#define FDMAP 0
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#if FDMAP
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#include <fcntl.h>
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struct OS_INIT
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{
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static int fd;
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OS_INIT();
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};
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OS_INIT os_init;
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int OS_INIT::fd = 0;
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OS_INIT::OS_INIT()
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{
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fd = open("/dev/zero", O_RDONLY);
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}
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#endif
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/***********************************
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* Map memory.
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*/
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void *os_mem_map(unsigned nbytes)
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{ void *p;
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errno = 0;
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#if FDMAP
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p = mmap(NULL, nbytes, PROT_READ | PROT_WRITE, MAP_PRIVATE, OS_INIT::fd, 0);
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#else
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p = mmap(NULL, nbytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
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#endif
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return (p == MAP_FAILED) ? NULL : p;
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}
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/***********************************
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* Commit memory.
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* Returns:
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* 0 success
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* !=0 failure
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*/
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int os_mem_commit(void *base, unsigned offset, unsigned nbytes)
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{
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return 0;
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}
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/***********************************
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* Decommit memory.
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* Returns:
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* 0 success
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* !=0 failure
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*/
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int os_mem_decommit(void *base, unsigned offset, unsigned nbytes)
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{
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return 0;
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}
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/***********************************
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* Unmap memory allocated with os_mem_map().
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* Returns:
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* 0 success
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* !=0 failure
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*/
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int os_mem_unmap(void *base, unsigned nbytes)
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{
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return munmap(base, nbytes);
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}
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