#include "efence.h"
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#ifndef PROT_NONE
#define PROT_NONE 0
#endif
#if ( !defined(MAP_ANONYMOUS) && defined(MAP_ANON) )
#define MAP_ANONYMOUS MAP_ANON
#endif
static caddr_t startAddr = (caddr_t) 0;
#if (!defined(sgi) && !defined(_AIX) && !defined(linux))
extern int sys_nerr;
extern char * sys_errlist[];
#endif
static const char *
stringErrorReport(void)
{
#if ( defined(sgi) )
return strerror(oserror());
#elif ( defined(_AIX) )
return strerror(errno);
#else
if ( errno > 0 && errno < sys_nerr )
return sys_errlist[errno];
else
return "Unknown error.\n";
#endif
}
#if defined(MAP_ANONYMOUS)
void *
Page_Create(size_t size)
{
caddr_t allocation;
allocation = (caddr_t) mmap(
startAddr
,(int)size
,PROT_READ|PROT_WRITE
,MAP_PRIVATE|MAP_ANONYMOUS
,-1
,0);
#ifndef __hpux
startAddr = allocation + size;
#endif
if ( allocation == (caddr_t)-1 )
EF_Exit("mmap() failed: %s", stringErrorReport());
return (void *)allocation;
}
#else
void *
Page_Create(size_t size)
{
static int devZeroFd = -1;
caddr_t allocation;
if ( devZeroFd == -1 ) {
devZeroFd = open("/dev/zero", O_RDWR);
if ( devZeroFd < 0 )
EF_Exit(
"open() on /dev/zero failed: %s"
,stringErrorReport());
}
allocation = (caddr_t) mmap(
startAddr
,(int)size
,PROT_READ|PROT_WRITE
,MAP_PRIVATE
,devZeroFd
,0);
startAddr = allocation + size;
if ( allocation == (caddr_t)-1 )
EF_Exit("mmap() failed: %s", stringErrorReport());
return (void *)allocation;
}
#endif
static void
mprotectFailed(void)
{
EF_Exit("mprotect() failed: %s", stringErrorReport());
}
void
Page_AllowAccess(void * address, size_t size)
{
if ( mprotect((caddr_t)address, size, PROT_READ|PROT_WRITE) < 0 )
mprotectFailed();
}
void
Page_DenyAccess(void * address, size_t size)
{
if ( mprotect((caddr_t)address, size, PROT_NONE) < 0 )
mprotectFailed();
}
void
Page_Delete(void * address, size_t size)
{
if ( munmap((caddr_t)address, size) < 0 )
Page_DenyAccess(address, size);
}
#if defined(_SC_PAGESIZE)
size_t
Page_Size(void)
{
return (size_t)sysconf(_SC_PAGESIZE);
}
#elif defined(_SC_PAGE_SIZE)
size_t
Page_Size(void)
{
return (size_t)sysconf(_SC_PAGE_SIZE);
}
#else
size_t
Page_Size(void)
{
return getpagesize();
}
#endif