#include <mono/utils/mono-memory-model.h>
#include <mono/utils/mono-mmap.h>
-enum {
- MMAP_KIND_FILE = 1,
- MMAP_KIND_MEMORY = 2
-};
-
typedef struct {
int kind;
int ref_count;
- gint64 capacity;
+ size_t capacity;
char *name;
-} Handle;
-
-typedef struct {
- Handle handle;
int fd;
-} FileHandle;
-
-typedef struct {
- Handle handle;
- void *address;
- size_t length;
-} MemoryHandle;
+} MmapHandle;
typedef struct {
void *address;
void *free_handle;
- int kind;
size_t length;
-} MmapHandle;
+} MmapInstance;
enum {
BAD_CAPACITY_FOR_FILE_BACKED = 1,
MMAP_FILE_ACCESS_READ_WRITE_EXECUTE = 5,
};
-#ifndef DEFFILEMODE
-#define DEFFILEMODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
+#ifdef DEFFILEMODE
+#define DEFAULT_FILEMODE DEFFILEMODE
+#else
+#define DEFAULT_FILEMODE 0666
#endif
static int mmap_init_state;
{
struct stat buf;
char *c_path = path ? mono_string_to_utf8 (path) : NULL;
- FileHandle *handle = NULL;
+ MmapHandle *handle = NULL;
int result, fd;
if (path)
}
if (path) //FIXME use io portability?
- fd = open (c_path, file_mode_to_unix (mode) | access_mode_to_unix (access), DEFFILEMODE);
+ fd = open (c_path, file_mode_to_unix (mode) | access_mode_to_unix (access), DEFAULT_FILEMODE);
else
fd = dup (input_fd);
int unused G_GNUC_UNUSED = ftruncate (fd, (off_t)*capacity);
}
- handle = g_new0 (FileHandle, 1);
- handle->handle.kind = MMAP_KIND_FILE;
- handle->handle.ref_count = 1;
- handle->handle.capacity = *capacity;
+ handle = g_new0 (MmapHandle, 1);
+ handle->ref_count = 1;
+ handle->capacity = *capacity;
handle->fd = fd;
done:
return (void*)handle;
}
+#define MONO_ANON_FILE_TEMPLATE "/mono.anonmap.XXXXXXXXX"
static void*
open_memory_map (MonoString *mapName, int mode, gint64 *capacity, int access, int options, int *error)
{
char *c_mapName;
- MemoryHandle *handle;
+ MmapHandle *handle;
if (*capacity <= 1) {
*error = CAPACITY_MUST_BE_POSITIVE;
return NULL;
c_mapName = mono_string_to_utf8 (mapName);
named_regions_lock ();
- handle = (MemoryHandle*)g_hash_table_lookup (named_regions, c_mapName);
+ handle = (MmapHandle*)g_hash_table_lookup (named_regions, c_mapName);
if (handle) {
- if (mode == FILE_MODE_CREATE_NEW)
+ if (mode == FILE_MODE_CREATE_NEW) {
*error = FILE_ALREADY_EXISTS;
+ goto done;
+ }
- handle->handle.ref_count++;
+ handle->ref_count++;
//XXX should we ftruncate if the file is smaller than capacity?
} else {
- if (mode == FILE_MODE_OPEN)
- *error = FILE_NOT_FOUND;
+ int fd;
+ char *file_name;
+ const char *tmp_dir;
+ int unused G_GNUC_UNUSED, alloc_size;
+ if (mode == FILE_MODE_OPEN) {
+ *error = FILE_NOT_FOUND;
+ goto done;
+ }
*capacity = align_up_to_page_size (*capacity);
- handle = g_new0 (MemoryHandle, 1);
- handle->handle.kind = MMAP_KIND_MEMORY;
- handle->handle.ref_count = 1;
- handle->handle.capacity = *capacity;
- handle->handle.name = g_strdup (c_mapName);
+ tmp_dir = g_get_tmp_dir ();
+ alloc_size = strlen (tmp_dir) + strlen (MONO_ANON_FILE_TEMPLATE) + 1;
+ if (alloc_size > 1024) {//rather fail that stack overflow
+ *error = COULD_NOT_MAP_MEMORY;
+ goto done;
+ }
+ file_name = alloca (alloc_size);
+ strcpy (file_name, tmp_dir);
+ strcat (file_name, MONO_ANON_FILE_TEMPLATE);
+
+ fd = mkstemp (file_name);
+ if (fd == -1) {
+ *error = COULD_NOT_MAP_MEMORY;
+ goto done;
+ }
+
+ unlink (file_name);
+ unused = ftruncate (fd, (off_t)*capacity);
+
+ handle = g_new0 (MmapHandle, 1);
+ handle->ref_count = 1;
+ handle->capacity = *capacity;
+ handle->fd = fd;
+ handle->name = g_strdup (c_mapName);
+
+ g_hash_table_insert (named_regions, handle->name, handle);
- //FIXME compute RWX from access
- handle->address = mono_valloc (NULL, (size_t)*capacity, MONO_MMAP_READ | MONO_MMAP_WRITE | MONO_MMAP_PRIVATE | MONO_MMAP_ANON);
- handle->length = (size_t)*capacity;
- g_hash_table_insert (named_regions, handle->handle.name, handle);
}
+done:
named_regions_unlock ();
g_free (c_mapName);
return open_file_map (path, -1, mode, capacity, access, options, error);
if (path) {
- FileHandle *file_handle;
+ MmapHandle *handle;
char *c_mapName = mono_string_to_utf8 (mapName);
named_regions_lock ();
- file_handle = (FileHandle*)g_hash_table_lookup (named_regions, c_mapName);
- if (file_handle) {
+ handle = (MmapHandle*)g_hash_table_lookup (named_regions, c_mapName);
+ if (handle) {
*error = FILE_ALREADY_EXISTS;
- file_handle = NULL;
+ handle = NULL;
} else {
- file_handle = open_file_map (path, -1, mode, capacity, access, options, error);
- if (file_handle) {
- file_handle->handle.name = g_strdup (c_mapName);
- g_hash_table_insert (named_regions, file_handle->handle.name, file_handle);
+ handle = open_file_map (path, -1, mode, capacity, access, options, error);
+ if (handle) {
+ handle->name = g_strdup (c_mapName);
+ g_hash_table_insert (named_regions, handle->name, handle);
}
}
named_regions_unlock ();
g_free (c_mapName);
- return file_handle;
+ return handle;
}
return open_memory_map (mapName, mode, capacity, access, options, error);
}
void *
-mono_mmap_open_handle (void *handle, MonoString *mapName, gint64 *capacity, int access, int options, int *error)
+mono_mmap_open_handle (void *input_fd, MonoString *mapName, gint64 *capacity, int access, int options, int *error)
{
- FileHandle *file_handle;
+ MmapHandle *handle;
char *c_mapName = mono_string_to_utf8 (mapName);
named_regions_lock ();
- file_handle = (FileHandle*)g_hash_table_lookup (named_regions, c_mapName);
- if (file_handle) {
+ handle = (MmapHandle*)g_hash_table_lookup (named_regions, c_mapName);
+ if (handle) {
*error = FILE_ALREADY_EXISTS;
- file_handle = NULL;
+ handle = NULL;
} else {
//XXX we're exploiting wapi HANDLE == FD equivalence. THIS IS FRAGILE, create a _wapi_handle_to_fd call
- file_handle = open_file_map (NULL, GPOINTER_TO_INT (handle), FILE_MODE_OPEN, capacity, access, options, error);
- file_handle->handle.name = g_strdup (c_mapName);
- g_hash_table_insert (named_regions, file_handle->handle.name, file_handle);
+ handle = open_file_map (NULL, GPOINTER_TO_INT (input_fd), FILE_MODE_OPEN, capacity, access, options, error);
+ handle->name = g_strdup (c_mapName);
+ g_hash_table_insert (named_regions, handle->name, handle);
}
named_regions_unlock ();
g_free (c_mapName);
- return file_handle;
+ return handle;
}
void
mono_mmap_close (void *mmap_handle)
{
- Handle *handle = mmap_handle;
+ MmapHandle *handle = mmap_handle;
named_regions_lock ();
--handle->ref_count;
if (handle->ref_count == 0) {
if (handle->name)
g_hash_table_remove (named_regions, handle->name);
-
+
g_free (handle->name);
- if (handle->kind == MMAP_KIND_MEMORY)
- mono_vfree (((MemoryHandle*)handle)->address, ((MemoryHandle*)handle)->length);
- else
- close (((FileHandle*)handle)->fd);
+ close (handle->fd);
g_free (handle);
}
named_regions_unlock ();
void
mono_mmap_configure_inheritability (void *mmap_handle, gboolean inheritability)
{
- FileHandle *h = mmap_handle;
+ MmapHandle *h = mmap_handle;
int fd, flags;
- if (h->handle.kind != MMAP_KIND_FILE)
- return;
-
fd = h->fd;
flags = fcntl (fd, F_GETFD, 0);
if (inheritability)
void
mono_mmap_flush (void *mmap_handle)
{
- MmapHandle *h = mmap_handle;
+ MmapInstance *h = mmap_handle;
if (h)
msync (h->address, h->length, MS_SYNC);
mono_mmap_map (void *handle, gint64 offset, gint64 *size, int access, void **mmap_handle, void **base_address)
{
gint64 mmap_offset = 0;
- Handle *h = handle;
- MmapHandle res = { 0 };
- if (h->kind == MMAP_KIND_FILE) {
- FileHandle *fh = (FileHandle*)h;
- size_t eff_size = *size;
- struct stat buf = { 0 };
- fstat (fh->fd, &buf); //FIXME error handling
-
- /**
- * We use the file size if one of the following conditions is true:
- * -input size is zero
- * -input size is bigger than the file and the file is not a magical zero size file such as /dev/mem.
- */
- if (eff_size == 0 || (eff_size > buf.st_size && !is_special_zero_size_file (&buf)))
- eff_size = buf.st_size;
- *size = eff_size;
-
- mmap_offset = align_down_to_page_size (offset);
- eff_size += (offset - mmap_offset);
- //FIXME translate some interesting errno values
- res.address = mono_file_map ((size_t)eff_size, acess_to_mmap_flags (access), fh->fd, mmap_offset, &res.free_handle);
- res.length = eff_size;
- res.kind = MMAP_KIND_FILE;
-
- } else {
- MemoryHandle *mh = (MemoryHandle*)h;
- size_t eff_size = *size;
-
- if (!eff_size)
- eff_size = *size = mh->length;
- mmap_offset = (size_t)offset;
- res.address = (char*)mh->address + offset;
- res.length = (size_t)*size;
- res.kind = MMAP_KIND_MEMORY;
- }
+ MmapHandle *fh = handle;
+ MmapInstance res = { 0 };
+ size_t eff_size = *size;
+ struct stat buf = { 0 };
+ fstat (fh->fd, &buf); //FIXME error handling
+
+ /**
+ * We use the file size if one of the following conditions is true:
+ * -input size is zero
+ * -input size is bigger than the file and the file is not a magical zero size file such as /dev/mem.
+ */
+ if (eff_size == 0 || (eff_size > buf.st_size && !is_special_zero_size_file (&buf)))
+ eff_size = buf.st_size;
+ *size = eff_size;
+
+ mmap_offset = align_down_to_page_size (offset);
+ eff_size += (offset - mmap_offset);
+ //FIXME translate some interesting errno values
+ res.address = mono_file_map ((size_t)eff_size, acess_to_mmap_flags (access), fh->fd, mmap_offset, &res.free_handle);
+ res.length = eff_size;
if (res.address) {
- *mmap_handle = g_memdup (&res, sizeof (MmapHandle));
+ *mmap_handle = g_memdup (&res, sizeof (MmapInstance));
*base_address = (char*)res.address + (offset - mmap_offset);
return 0;
}
mono_mmap_unmap (void *mmap_handle)
{
int res = 0;
- MmapHandle *h = mmap_handle;
+ MmapInstance *h = mmap_handle;
- if (h->kind == MMAP_KIND_FILE)
- res = mono_file_unmap (h->address, h->free_handle);
+ res = mono_file_unmap (h->address, h->free_handle);
g_free (h);
return res == 0;
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