1.要求将当前路径下，所有文件的权限及最后一次的访问时间提取出来，写入到file.txt中! !提示: opendir readir stat-->提取出来的数据写入到file.xt中

#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>int main(int argc, const char *argv[])
{DIR* op = opendir("../01标准IO");if( op == NULL ){perror("opendir");return -1;}printf("文件打开成功!!!\n");FILE* fop = fopen("./test2_29hk.txt","w");struct dirent* rd = NULL;  struct stat msg;while(1){rd = readdir(op);if(rd == NULL ){if( 0 == errno)printf("文件以读完!!\n");elseperror("readdir\n");break;}if( stat(rd->d_name,&msg) < 0 ){perror("stat\n");return -1;}printf("%o--->",msg.st_mode);struct tm* date;date = localtime(&msg.st_ctime);printf("%04d-%02d-%02d %02d:%02d:%02d\n",\date->tm_year+1900, date->tm_mon+1, date->tm_mday,\date->tm_hour, date->tm_min, date->tm_sec);fprintf(fop,"%o  %04d-%02d-%02d %02d:%02d:%02d\n",msg.st_mode,\date->tm_year+1900, date->tm_mon+1, date->tm_mday,\date->tm_hour, date->tm_min, date->tm_sec);}if(fclose(op_w) < 0){perror("fclose");return -1;}if( closedir(op) < 0){perror("closedir");return -1;}return 0;
}

使用文件IO对图片进行拷贝。要求子进程拷贝后半部分，父进程拷贝前半部分。提示:

1.图片就是一个普通文件，普通文件怎么拷贝，图片就怎么拷贝。读一个字符，写一个字符，循环size/2次

2.diff可以查看两个文件是否一致，例如diff 1.png 2.png，可以查看两张图片是否一致

3.终端输入: eog 1.png可以打开1.png这张图片

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>int main(int argc, const char *argv[])
{	struct stat msg;if( stat("./cq.jpg",&msg) < 0){perror("stat");return -1;}printf("%ld\n",msg.st_size);int size = msg.st_size;int cq = open("./cq.jpg",O_RDONLY);int op1 = open("./f.jpg",O_WRONLY|O_CREAT|O_TRUNC,0775);
//	int op2 = open("./z.jpg",O_WRONLY|O_CREAT|O_TRUNC,0775);pid_t cpid = fork();if( cpid > 0){//父char c;int i=0;while( read(cq, &c, sizeof(c)) > 0 && i<(size/2) ){	write(op1, &c,sizeof(c));i++;}off_t d1 = lseek(cq, 0, SEEK_CUR);printf("第一次移动到大小%ld\n",d1);}else if( cpid == 0 ){// 子sleep(1);char d;int j=0;off_t d2 = lseek(cq, -1, SEEK_CUR);while( read(cq, &d, sizeof(d)) > 0){write(op1, &d,sizeof(d));}}else{perror("fork");return -1;}while(1){sleep(1);}close(op1);return 0;
}