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0ef38c0b9c
Apps targeting SDK 29 are not allowed to open /dev/ashmem directly, and instead must use NDK functions. Those functions are only available in SDK 26 and higher, so we need this shim to use the functions if they are available, else fallback to opening /dev/ashmem directly. Differential Revision: https://phabricator.services.mozilla.com/D61012 --HG-- extra : moz-landing-system : lando
74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <cstring>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <linux/ashmem.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "Ashmem.h"
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namespace mozilla {
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namespace android {
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static void* libhandle() {
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static void* handle = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
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return handle;
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}
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int ashmem_create(const char* name, size_t size) {
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static auto fCreate =
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(int (*)(const char*, size_t))dlsym(libhandle(), "ASharedMemory_create");
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if (fCreate) {
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return fCreate(name, size);
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}
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int fd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
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if (fd < 0) {
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return fd;
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}
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if (name) {
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char str[ASHMEM_NAME_LEN];
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strlcpy(str, name, sizeof(str));
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ioctl(fd, ASHMEM_SET_NAME, str);
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}
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if (ioctl(fd, ASHMEM_SET_SIZE, size) != 0) {
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close(fd);
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return -1;
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}
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return fd;
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}
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size_t ashmem_getSize(int fd) {
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static auto fGetSize =
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(size_t(*)(int))dlsym(libhandle(), "ASharedMemory_getSize");
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if (fGetSize) {
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return fGetSize(fd);
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}
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return (size_t)ioctl(fd, ASHMEM_GET_SIZE, nullptr);
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}
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int ashmem_setProt(int fd, int prot) {
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static auto fSetProt =
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(int (*)(int, int))dlsym(libhandle(), "ASharedMemory_setProt");
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if (fSetProt) {
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return fSetProt(fd, prot);
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}
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return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
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}
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} // namespace android
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} // namespace mozilla
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