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1 /* | |
2 * Copyright (c) 2012 The Native Client Authors. All rights reserved. | |
3 * Use of this source code is governed by a BSD-style license that can be | |
4 * found in the LICENSE file. | |
5 */ | |
6 | |
7 /* | |
8 * Subclass of the gio object for use in trusted code, providing I/O | |
9 * services to a shared memory object. | |
10 */ | |
11 | |
12 #ifndef NATIVE_CLIENT_SRC_TRUSTED_GIO_WRAPPED_DESC_GIO_SHM_H_ | |
13 #define NATIVE_CLIENT_SRC_TRUSTED_GIO_WRAPPED_DESC_GIO_SHM_H_ | |
14 | |
15 #include "native_client/src/include/nacl_base.h" | |
16 | |
17 #include "native_client/src/shared/gio/gio.h" | |
18 | |
19 EXTERN_C_BEGIN | |
20 | |
21 struct NaClDesc; | |
22 | |
23 struct NaClGioShm { | |
24 /* public */ | |
25 struct Gio base; | |
26 struct NaClDesc *shmp; | |
27 /* | |
28 * the shmp is public for e.g. xferring via nrd_xfer | |
29 */ | |
30 | |
31 size_t io_offset; | |
32 size_t shm_sz; | |
33 char *cur_window; | |
34 size_t window_offset; | |
35 size_t window_size; | |
36 }; | |
37 | |
38 /* | |
39 * Create a Gio object backed by a NaClDesc -- any NaClDesc objects | |
40 * for which the Map virtual function is usable. The shm_size is the | |
41 * size of the file data in the shm object -- so the requirement is | |
42 * that *shmp object's size is at least shm_size (and it would | |
43 * normally be, since the object size is rounded to | |
44 * NACL_MAP_PAGESIZE). The shm_size value is used to limit Seek and | |
45 * to know when to report EOF on Read. | |
46 * | |
47 * The NaClGioShm object is read-only. It takes a reference to the | |
48 * shmp when constructed, and releases a reference on destruction. | |
49 */ | |
50 int NaClGioShmCtor(struct NaClGioShm *self, | |
51 struct NaClDesc *shmp, | |
52 size_t shm_size); | |
53 | |
54 int NaClGioShmAllocCtor(struct NaClGioShm *self, | |
55 size_t shm_size); | |
56 | |
57 /* Dtor is a virtual function */ | |
58 | |
59 EXTERN_C_END | |
60 | |
61 #endif /* NATIVE_CLIENT_SRC_TRUSTED_GIO_WRAPPED_DESC_GIO_SHM_H_ */ | |
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