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comparison: gfx/skia/trunk/src/utils/android/ashmem.cpp
gfx/skia/trunk/src/utils/android/ashmem.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:48f7517f9097 |
|---|---|
| 1 /* | |
| 2 * Copyright 2008 The Android Open Source Project | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 /* | |
| 9 * Implementation of the user-space ashmem API for devices, which have our | |
| 10 * ashmem-enabled kernel. See ashmem-sim.c for the "fake" tmp-based version, | |
| 11 * used by the simulator. | |
| 12 */ | |
| 13 | |
| 14 #include <android/ashmem.h> | |
| 15 | |
| 16 #include <unistd.h> | |
| 17 #include <string.h> | |
| 18 #include <sys/types.h> | |
| 19 #include <sys/stat.h> | |
| 20 #include <sys/ioctl.h> | |
| 21 #include <fcntl.h> | |
| 22 | |
| 23 #include <linux/ashmem.h> | |
| 24 | |
| 25 #define ASHMEM_DEVICE "/dev/ashmem" | |
| 26 | |
| 27 /* | |
| 28 * ashmem_create_region - creates a new ashmem region and returns the file | |
| 29 * descriptor, or <0 on error | |
| 30 * | |
| 31 * `name' is an optional label to give the region (visible in /proc/pid/maps) | |
| 32 * `size' is the size of the region, in page-aligned bytes | |
| 33 */ | |
| 34 int ashmem_create_region(const char *name, size_t size) | |
| 35 { | |
| 36 int fd, ret; | |
| 37 | |
| 38 fd = open(ASHMEM_DEVICE, O_RDWR); | |
| 39 if (fd < 0) | |
| 40 return fd; | |
| 41 | |
| 42 if (name) { | |
| 43 char buf[ASHMEM_NAME_LEN]; | |
| 44 | |
| 45 strlcpy(buf, name, sizeof(buf)); | |
| 46 ret = ioctl(fd, ASHMEM_SET_NAME, buf); | |
| 47 if (ret < 0) | |
| 48 goto error; | |
| 49 } | |
| 50 | |
| 51 ret = ioctl(fd, ASHMEM_SET_SIZE, size); | |
| 52 if (ret < 0) | |
| 53 goto error; | |
| 54 | |
| 55 return fd; | |
| 56 | |
| 57 error: | |
| 58 close(fd); | |
| 59 return ret; | |
| 60 } | |
| 61 | |
| 62 int ashmem_set_prot_region(int fd, int prot) | |
| 63 { | |
| 64 return ioctl(fd, ASHMEM_SET_PROT_MASK, prot); | |
| 65 } | |
| 66 | |
| 67 int ashmem_pin_region(int fd, size_t offset, size_t len) | |
| 68 { | |
| 69 struct ashmem_pin pin = { offset, len }; | |
| 70 return ioctl(fd, ASHMEM_PIN, &pin); | |
| 71 } | |
| 72 | |
| 73 int ashmem_unpin_region(int fd, size_t offset, size_t len) | |
| 74 { | |
| 75 struct ashmem_pin pin = { offset, len }; | |
| 76 return ioctl(fd, ASHMEM_UNPIN, &pin); | |
| 77 } | |
| 78 | |
| 79 int ashmem_get_size_region(int fd) | |
| 80 { | |
| 81 return ioctl(fd, ASHMEM_GET_SIZE, NULL); | |
| 82 } | |
| 83 | |
| 84 int ashmem_purge_all_caches(int fd) | |
| 85 { | |
| 86 return ioctl(fd, ASHMEM_PURGE_ALL_CACHES, NULL); | |
| 87 } |
