目录属性操作

目录

• chdir
• getcwd
• mkdir
• rmdir
• opendir
• readdir
• closedir

chdir

int chdir(const char *path);

path: 切换的路径

getcwd

#include <unistd.h>

char *getcwd(char *buf, size_t size);

参数:
　　buf: 缓冲区, 存储当前的工作目录
　　size: 缓存区大小
返回值:
　　成功: 当前的工作目录
　　失败: NULL

#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char const *argv[])
{
	if (argc < 2) {
		printf("a.out dir\n");
	}

	int ret = chdir(argv[1]);
	if (ret == -1) {
		perror("chdir");
		exit(1);
	}

	int fd = open("char.txt", O_CREAT | O_RDWR, 0777);
	if (fd == -1) {
		perror("open");
		exit(1);
	}

	close(fd); 
	char buf[128];
	getcwd(buf, sizeof(buf));
	printf("current dir: %s\n", buf);
	
	return 0;
}

mkdir

int mkdir(const char *pathname, mode_t mode);

参数:
　　pathname: 创建的目录名
　　mode: 目录权限, 八进制的数, 实际权限: mode & ~umask

rmdir

int rmdir(const char *pathname);

opendir

DIR *opendir(const char *name);

readdir

struct dirent *readdir(DIR *dirp);

struct dirent {
   ino_t          d_ino;       // 此目录进入点的inode
   off_t          d_off;       // 目录文件开头至此目录进入点的位移
   unsigned short d_reclen;    ///d_name的长度, 不包含NULL字符
   unsigned char  d_type;      // d_name所指的文件类型
   char           d_name[256]; // 文件名
};

DT_BLK      This is a block device.

DT_CHR      This is a character device.

DT_DIR      This is a directory.

DT_FIFO     This is a named pipe (FIFO).

DT_LNK      This is a symbolic link.

DT_REG      This is a regular file.

DT_SOCK     This is a UNIX domain socket.

DT_UNKNOWN  The file type is unknown.

closedir

int closedir(DIR *dirp);