110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/*
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* Copyright (c) 2020 YuQing <384681@qq.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the Lesser GNU General Public License, version 3
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* or later ("LGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the Lesser GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <time.h>
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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 <sys/time.h>
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#include "fastcommon/logger.h"
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#include "fastcommon/shared_func.h"
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int main(int argc, char *argv[])
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{
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#define SEEK_POS (2 * 1024)
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char *filename;
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int fd;
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int result;
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int n;
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char buf[1024];
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if (argc < 2) {
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fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
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return 1;
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}
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log_init();
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filename = argv[1];
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/*
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if (access(filename, F_OK) == 0) {
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logError("file: "__FILE__", line: %d, "
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"file %s already exists", __LINE__, filename);
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return EEXIST;
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}
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*/
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//fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0644);
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fd = open(filename, O_RDWR | O_CREAT, 0644);
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if (fd < 0) {
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result = errno != 0 ? errno : EIO;
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logError("file: "__FILE__", line: %d, " \
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"open file %s fail, " \
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"errno: %d, error info: %s", \
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__LINE__, filename, \
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result, STRERROR(result));
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return result;
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}
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if (ftruncate(fd, 102400) < 0) {
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logError("file: "__FILE__", line: %d, " \
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"ftruncate file %s fail, " \
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"errno: %d, error info: %s", __LINE__, \
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filename, errno, STRERROR(errno));
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return errno != 0 ? errno : EIO;
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}
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if (lseek(fd, SEEK_POS, SEEK_SET) < 0) {
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logError("file: "__FILE__", line: %d, " \
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"lseek file %s fail, " \
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"errno: %d, error info: %s", __LINE__, \
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filename, errno, STRERROR(errno));
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return errno != 0 ? errno : EIO;
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}
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memset(buf, '\n', sizeof(buf));
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if ((n=write(fd, buf, sizeof(buf))) <= 0) {
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logError("file: "__FILE__", line: %d, " \
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"write to file %s fail, " \
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"errno: %d, error info: %s", __LINE__, \
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filename, errno, STRERROR(errno));
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return errno != 0 ? errno : EIO;
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}
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printf("write bytes: %d\n", n);
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if (lseek(fd, 0, SEEK_SET) < 0) {
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logError("file: "__FILE__", line: %d, " \
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"lseek file %s fail, " \
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"errno: %d, error info: %s", __LINE__, \
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filename, errno, STRERROR(errno));
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return errno != 0 ? errno : EIO;
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}
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if ((n=read(fd, buf, sizeof(buf))) <= 0) {
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logError("file: "__FILE__", line: %d, " \
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"read from file %s fail, " \
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"errno: %d, error info: %s", __LINE__, \
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filename, errno, STRERROR(errno));
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return errno != 0 ? errno : EIO;
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}
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printf("read bytes: %d, 0 => 0x%02x, %d => 0x%02x\n",
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n, (unsigned char)buf[0], n - 1, (unsigned char)buf[n - 1]);
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return 0;
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}
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