1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * you may not use this file except in compliance with the License. 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * You may obtain a copy of the License at 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * See the License for the specific language governing permissions and 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * limitations under the License. 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Implementation of the user-space ashmem API for the simulator, which lacks 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * an ashmem-enabled kernel. See ashmem-dev.c for the real ashmem-based version. 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <unistd.h> 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <string.h> 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdlib.h> 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <sys/types.h> 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <sys/stat.h> 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <fcntl.h> 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdio.h> 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <errno.h> 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <time.h> 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <limits.h> 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <cutils/ashmem.h> 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint ashmem_create_region(const char *ignored, size_t size) 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project static const char txt[] = "abcdefghijklmnopqrstuvwxyz" 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char name[64]; 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project unsigned int retries = 0; 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project pid_t pid = getpid(); 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int fd; 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project srand(time(NULL) + pid); 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectretry: 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project /* not beautiful, its just wolf-like loop unrolling */ 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project snprintf(name, sizeof(name), "/tmp/android-ashmem-%d-%c%c%c%c%c%c%c%c", 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project pid, 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))], 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))], 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))], 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))], 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))], 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))], 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))], 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project txt[(int) ((sizeof(txt) - 1) * (rand() / (RAND_MAX + 1.0)))]); 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project /* open O_EXCL & O_CREAT: we are either the sole owner or we fail */ 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fd = open(name, O_RDWR | O_CREAT | O_EXCL, 0600); 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (fd == -1) { 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project /* unlikely, but if we failed because `name' exists, retry */ 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (errno == EEXIST && ++retries < 6) 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project goto retry; 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return -1; 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project /* truncate the file to `len' bytes */ 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (ftruncate(fd, size) == -1) 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project goto error; 71dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 72dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (unlink(name) == -1) 73dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project goto error; 74dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 75dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return fd; 76dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projecterror: 77dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project close(fd); 78dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return -1; 79dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 80dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 81dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint ashmem_set_prot_region(int fd, int prot) 82dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 83dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return 0; 84dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 85dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 86dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint ashmem_pin_region(int fd, size_t offset, size_t len) 87dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 88dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return ASHMEM_NOT_PURGED; 89dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 90dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 91dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint ashmem_unpin_region(int fd, size_t offset, size_t len) 92dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 93dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return ASHMEM_IS_UNPINNED; 94dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 957be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert 967be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringertint ashmem_get_size_region(int fd) 977be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert{ 987be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert struct stat buf; 997be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert int result; 1007be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert 1017be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert result = fstat(fd, &buf); 1027be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert if (result == -1) { 1037be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert return -1; 1047be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert } 1057be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert 1067be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert // Check if this is an "ashmem" region. 1077be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert // TODO: This is very hacky, and can easily break. We need some reliable indicator. 1087be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert if (!(buf.st_nlink == 0 && S_ISREG(buf.st_mode))) { 1097be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert errno = ENOTTY; 1107be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert return -1; 1117be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert } 1127be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert 1137be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert return (int)buf.st_size; // TODO: care about overflow (> 2GB file)? 1147be52b1a0e052635b361f9d8c186adbbcc981b7eBjorn Bringert} 115