133 lines
3.9 KiB
C++
133 lines
3.9 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <fs_mgr.h>
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#include "bootloader.h"
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#include "common.h"
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#include "roots.h"
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#include <android-base/unique_fd.h>
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static int get_bootloader_message_block(bootloader_message* out, const Volume* v);
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static int set_bootloader_message_block(const bootloader_message* in, const Volume* v);
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int get_bootloader_message(bootloader_message* out) {
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Volume* v = volume_for_path("/misc");
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if (v == nullptr) {
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LOGE("Cannot load volume /misc!\n");
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return -1;
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}
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if (strcmp(v->fs_type, "emmc") == 0) {
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return get_bootloader_message_block(out, v);
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}
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LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
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return -1;
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}
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int set_bootloader_message(const bootloader_message* in) {
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Volume* v = volume_for_path("/misc");
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if (v == nullptr) {
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LOGE("Cannot load volume /misc!\n");
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return -1;
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}
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if (strcmp(v->fs_type, "emmc") == 0) {
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return set_bootloader_message_block(in, v);
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}
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LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
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return -1;
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}
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// ------------------------------------
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// for misc partitions on block devices
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// ------------------------------------
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static void wait_for_device(const char* fn) {
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int tries = 0;
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int ret;
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do {
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++tries;
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struct stat buf;
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ret = stat(fn, &buf);
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if (ret == -1) {
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printf("failed to stat \"%s\" try %d: %s\n", fn, tries, strerror(errno));
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sleep(1);
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}
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} while (ret && tries < 10);
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if (ret) {
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printf("failed to stat \"%s\"\n", fn);
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}
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}
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static int get_bootloader_message_block(bootloader_message* out,
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const Volume* v) {
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wait_for_device(v->blk_device);
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FILE* f = fopen(v->blk_device, "rb");
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if (f == nullptr) {
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LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
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return -1;
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}
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bootloader_message temp;
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int count = fread(&temp, sizeof(temp), 1, f);
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if (count != 1) {
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LOGE("failed to read \"%s\": %s\n", v->blk_device, strerror(errno));
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return -1;
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}
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if (fclose(f) != 0) {
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LOGE("failed to close \"%s\": %s\n", v->blk_device, strerror(errno));
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return -1;
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}
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memcpy(out, &temp, sizeof(temp));
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return 0;
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}
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static int set_bootloader_message_block(const bootloader_message* in,
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const Volume* v) {
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wait_for_device(v->blk_device);
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android::base::unique_fd fd(open(v->blk_device, O_WRONLY | O_SYNC));
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if (fd == -1) {
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LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
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return -1;
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}
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size_t written = 0;
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const uint8_t* start = reinterpret_cast<const uint8_t*>(in);
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size_t total = sizeof(*in);
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while (written < total) {
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ssize_t wrote = TEMP_FAILURE_RETRY(write(fd, start + written, total - written));
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if (wrote == -1) {
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LOGE("failed to write %" PRId64 " bytes: %s\n",
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static_cast<off64_t>(written), strerror(errno));
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return -1;
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}
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written += wrote;
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}
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if (fsync(fd) == -1) {
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LOGE("failed to fsync \"%s\": %s\n", v->blk_device, strerror(errno));
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return -1;
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}
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return 0;
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}
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