/* create a temp file for anonymous mappings */
struct file *create_temp_file( int access )
{
char tmpfn[16];
int fd;
sprintf( tmpfn, "anonmap.XXXXXX" ); /* create it in the server directory */
fd = mkstemps( tmpfn, 0 );
if (fd == -1)
{
file_set_error();
return NULL;
}
unlink( tmpfn );
return create_file_for_fd( fd, access, 0 );
}
/* allocate and fill the temp file for a shared PE image mapping */
static int build_shared_mapping( struct mapping *mapping, int fd,
IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
{
struct shared_map *shared;
struct file *file;
unsigned int i;
mem_size_t total_size;
size_t file_size, map_size, max_size;
off_t shared_pos, read_pos, write_pos;
char *buffer = NULL;
int shared_fd;
long toread;
/* compute the total size of the shared mapping */
total_size = max_size = 0;
for (i = 0; i < nb_sec; i++)
{
if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
{
get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
if (file_size > max_size) max_size = file_size;
total_size += map_size;
}
}
if (!total_size) return 1; /* nothing to do */
if ((mapping->shared = get_shared_file( mapping->fd ))) return 1;
/* create a temp file for the mapping */
if ((shared_fd = create_temp_file( total_size )) == -1) return 0;
if (!(file = create_file_for_fd( shared_fd, FILE_GENERIC_READ|FILE_GENERIC_WRITE, 0 ))) return 0;
if (!(buffer = malloc( max_size ))) goto error;
/* copy the shared sections data into the temp file */
shared_pos = 0;
for (i = 0; i < nb_sec; i++)
{
if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
write_pos = shared_pos;
shared_pos += map_size;
if (!sec[i].PointerToRawData || !file_size) continue;
toread = file_size;
while (toread)
{
long res = pread( fd, buffer + file_size - toread, toread, read_pos );
if (!res && toread < 0x200) /* partial sector at EOF is not an error */
{
file_size -= toread;
break;
}
if (res <= 0) goto error;
toread -= res;
read_pos += res;
}
if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
}
if (!(shared = alloc_object( &shared_map_ops ))) goto error;
shared->fd = (struct fd *)grab_object( mapping->fd );
shared->file = file;
list_add_head( &shared_map_list, &shared->entry );
mapping->shared = shared;
free( buffer );
return 1;
error:
release_object( file );
free( buffer );
return 0;
}