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syscall_mman.c
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syscall_mman.c
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/*-
* Copyright (c) 2013 Antti Kantee. All Rights Reserved.
*
* 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 OR CONTRIBUTORS 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.
*/
/*
* Emulate a bit of memory management syscalls. Most are nops due
* to the fact that there is virtual memory. Things like mprotect()
* don't work 100% correctly, but we can't really do anything about it,
* so we lie to the caller and cross our fingers.
*/
/* for libc namespace */
#define mmap _mmap
#include <sys/cdefs.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef RUMPRUN_MMAP_DEBUG
#define MMAP_PRINTF(x) printf x
#else
#define MMAP_PRINTF(x)
#endif
void *
mmap(void *addr, size_t len, int prot, int flags, int fd, off_t off)
{
void *v;
ssize_t nn;
long pagesize = sysconf(_SC_PAGESIZE);
int error;
if (fd != -1 && prot != PROT_READ) {
MMAP_PRINTF(("mmap: trying to r/w map a file. failing!\n"));
errno = ENOTSUP;
return MAP_FAILED;
}
if ((error = posix_memalign(&v, pagesize, len)) != 0) {
errno = error;
return MAP_FAILED;
}
if (flags & MAP_ANON)
return v;
if ((nn = pread(fd, v, len, off)) == -1) {
MMAP_PRINTF(("mmap: failed to populate r/o file mapping!\n"));
error = errno;
free(v);
errno = error;
return MAP_FAILED;
}
return v;
}
#undef mmap
__weak_alias(mmap,_mmap);
int _sys__msync13(void *, size_t, int);
int
_sys__msync13(void *addr, size_t len, int flags)
{
long pagesize = sysconf(_SC_PAGESIZE);
/* catch a few easy errors */
if (((uintptr_t)addr & (pagesize-1)) != 0)
return EINVAL;
if ((flags & (MS_SYNC|MS_ASYNC)) == (MS_SYNC|MS_ASYNC))
return EINVAL;
/* otherwise just pretend that we are the champions my friend */
return 0;
}
int
munmap(void *addr, size_t len)
{
free(addr);
return 0;
}
int
madvise(void *addr, size_t len, int adv)
{
return 0;
}
int
mprotect(void *addr, size_t len, int prot)
{
return 0;
}
int
minherit(void *addr, size_t len, int inherit)
{
return 0;
}
int
mlockall(int flags)
{
return 0;
}
int
munlockall(void)
{
return 0;
}
int
mlock(const void *addr, size_t len)
{
return 0;
}
int
munlock(const void *addr, size_t len)
{
return 0;
}
int
mincore(void *addr, size_t length, char *vec)
{
long page_size = sysconf(_SC_PAGESIZE);
memset(vec, 0x01, (length + page_size - 1) / page_size);
return 0;
}