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83 lines
2.2 KiB
83 lines
2.2 KiB
10 years ago
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/*
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This file is part of ethash.
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ethash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ethash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ethash. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file io_posix.c
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* @author Lefteris Karapetsas <lefteris@ethdev.com>
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* @date 2015
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*/
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#include "io.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <libgen.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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static const char DAG_FILE_NAME[] = "full";
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static const char DAG_MEMO_NAME[] = "full.info";
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static const unsigned int DAG_MEMO_BYTESIZE = 36;
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bool ethash_io_prepare(char const *dirname, uint32_t block_number)
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{
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char read_buffer[DAG_MEMO_BYTESIZE];
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char expect_buffer[DAG_MEMO_BYTESIZE];
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bool ret = false;
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// assert directory exists, full owner permissions and read/search for others
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int rc = mkdir(dirname, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
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if (rc == -1 && errno != EEXIST) {
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goto end;
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}
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// try to open memo file
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char *memofile = malloc(strlen(dirname) + sizeof(DAG_MEMO_NAME));
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if (!memofile) {
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goto end;
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}
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FILE *f = fopen(memofile, "rb");
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if (!f) {
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// file does not exist, so no checking happens. All is fine.
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ret = true;
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goto free_memo;
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}
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if (fread(read_buffer, 1, DAG_MEMO_BYTESIZE, f) != DAG_MEMO_BYTESIZE) {
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goto free_memo;
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}
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ethash_io_serialize_info(REVISION, block_number, expect_buffer);
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if (memcmp(read_buffer, expect_buffer, DAG_MEMO_BYTESIZE) != 0) {
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// we have different memo contents so delete the memo file
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if (unlink(memofile) != 0) {
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goto free_memo;
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}
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}
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ret = true;
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free_memo:
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free(memofile);
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end:
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return ret;
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}
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void ethash_io_write()
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{
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}
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