Source code

Revision control

Other Tools

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <cstring>
#include <dlfcn.h>
#include <fcntl.h>
#include <linux/ashmem.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "Ashmem.h"
namespace mozilla {
namespace android {
static void* libhandle() {
static void* handle = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
return handle;
}
int ashmem_create(const char* name, size_t size) {
static auto fCreate =
(int (*)(const char*, size_t))dlsym(libhandle(), "ASharedMemory_create");
if (fCreate) {
return fCreate(name, size);
}
int fd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
if (fd < 0) {
return fd;
}
if (name) {
char str[ASHMEM_NAME_LEN];
strlcpy(str, name, sizeof(str));
ioctl(fd, ASHMEM_SET_NAME, str);
}
if (ioctl(fd, ASHMEM_SET_SIZE, size) != 0) {
close(fd);
return -1;
}
return fd;
}
size_t ashmem_getSize(int fd) {
static auto fGetSize =
(size_t(*)(int))dlsym(libhandle(), "ASharedMemory_getSize");
if (fGetSize) {
return fGetSize(fd);
}
return (size_t)ioctl(fd, ASHMEM_GET_SIZE, nullptr);
}
int ashmem_setProt(int fd, int prot) {
static auto fSetProt =
(int (*)(int, int))dlsym(libhandle(), "ASharedMemory_setProt");
if (fSetProt) {
return fSetProt(fd, prot);
}
return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
}
} // namespace android
} // namespace mozilla