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#include "HsMmap.h"
#define _LARGEFILE64_SOURCE 1
#define _FILE_OFFSET_BITS 64
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/errno.h>
#ifdef _DEBUG
int counters = 0;
int system_io_mmap_counters()
{
return counters;
}
#endif
//foreign import ccall unsafe "system_io_mmap_file_open" c_system_io_mmap_file_open :: CString -> CInt -> IO (Ptr ())
void *system_io_mmap_file_open(const char *filepath, int mode)
{
void *handle = NULL;
int access, fd;
if( !filepath )
return NULL;
switch(mode) {
case 0:
access = O_RDONLY;
break;
case 1:
access = O_RDWR;
break;
case 2:
access = O_RDONLY;
break;
case 3:
access = O_RDWR|O_CREAT;
break;
default:
return NULL;
}
#ifdef O_NOCTTY
access |= O_NOCTTY;
#endif
#ifdef O_LARGEFILE
access |= O_LARGEFILE;
#endif
#ifdef O_NOINHERIT
access |= O_NOINHERIT;
#endif
fd = open(filepath,access,0666);
if( fd == -1 ) {
return NULL;
}
#ifdef _DEBUG
counters++;
#endif
handle = (void *)((intptr_t)fd + 1);
return handle;
}
//foreign import ccall unsafe "system_io_mmap_file_close" c_system_io_mmap_file_close :: FunPtr(Ptr () -> IO ())
void system_io_mmap_file_close(void *handle)
{
int fd = (int)(intptr_t)handle - 1;
close(fd);
#ifdef _DEBUG
counters--;
#endif
}
static char zerolength[1];
//foreign import ccall unsafe "system_io_mmap_mmap" c_system_io_mmap_mmap :: Ptr () -> CInt -> CLLong -> CInt -> IO (Ptr ())
void *system_io_mmap_mmap(void *handle, int mode, long long offset, size_t size)
{
void *ptr = NULL;
int prot;
int flags;
int fd = (int)(intptr_t)handle - 1;
switch(mode) {
case 0:
prot = PROT_READ;
flags = MAP_PRIVATE;
break;
case 1:
prot = PROT_READ|PROT_WRITE;
flags = MAP_SHARED;
break;
case 2:
prot = PROT_READ|PROT_WRITE;
flags = MAP_PRIVATE;
break;
case 3:
prot = PROT_READ|PROT_WRITE;
flags = MAP_SHARED;
break;
default:
return NULL;
}
if( size>0 ) {
ptr = mmap(NULL,size,prot,flags,fd,offset);
if( ptr == MAP_FAILED ) {
return NULL;
}
}
else {
ptr = zerolength;
}
#ifdef _DEBUG
if( ptr ) {
counters++;
}
#endif
return ptr;
}
void system_io_mmap_munmap(void *sizeasptr, void *ptr) // Ptr CInt -> Ptr a -> IO ()
{
size_t size = (size_t)sizeasptr;
int result = 0;
if( size>0 ) {
result = munmap(ptr,size);
#ifdef _DEBUG
if( result==0 ) {
counters--;
}
#endif
}
else {
#ifdef _DEBUG
counters--;
#endif
}
}
//foreign import ccall unsafe "system_io_mmap_file_size" c_system_io_file_size :: Ptr () -> IO (CLLong)
long long system_io_mmap_file_size(void *handle)
{
int fd = (int)(intptr_t)handle - 1;
struct stat st;
fstat(fd,&st);
return st.st_size;
}
int system_io_mmap_extend_file_size(void *handle, long long size)
{
int fd = (int)(intptr_t)handle - 1;
return ftruncate(fd,size);
}
//foreign import ccall unsafe "system_io_mmap_granularity" c_system_io_granularity :: CInt
int system_io_mmap_granularity()
{
return getpagesize();
}
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