1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "mystdlib.h"
MAP map_file( char *filename, int readonly )
{
struct stat fstatus;
MAP map = (MAP)malloc( sizeof( *map ));
if( map )
{
memset( map, 0, sizeof( *map ));
if( ( map->fh = open( filename, readonly ? O_RDONLY : O_RDWR ) ) >= 0 )
{
fstat( map->fh, &fstatus );
map->size = (size_t)fstatus.st_size;
if (!map->size) return map;
if( ( map->addr = mmap( NULL, map->size,
PROT_READ | ( readonly ? 0 : PROT_WRITE), (readonly ? MAP_PRIVATE : MAP_SHARED), map->fh, 0) ) == MAP_FAILED )
{
fprintf( stderr, "Mapping file '%s' failed\n", filename );
close( map->fh ); free( map ); map = NULL;
}
} else {
fprintf( stderr, "Couldn't open file: '%s'\n", filename );
free( map ); map = NULL;
}
} else {
fputs( "Couldn't allocate memory", stderr );
}
return map;
}
void unmap_file ( MAP *pMap )
{
if( !pMap || !*pMap ) return;
munmap( (*pMap)->addr, (*pMap)->size);
close( (*pMap)->fh);
free( *pMap ); *pMap = NULL;
}
int getfilesize( int fd, size_t *size)
{
struct stat sb;
if( fstat( fd, &sb )) return -1;
*size = (size_t)sb.st_size;
return 0;
}
|
