| 词条 | fchdir |
| 释义 | 函数简介函数名称：fchdir 简介：fchdir是C语言中的一个系统调用函数 功能：改变当前工作目录 头文件：unistd.h 函数形式：int fchdir(int fd); 返回值：成功返回0，失败返回-1 示例程序//Linux环境下(Linux deepin 11.06RC2)测试通过 #include <unistd.h> #include <stdio.h> #include <stdlib.h> int main(void) { long cur_path_len; char * cur_work_dir; int fd;//file descriptor //get the max length of the directory if ((cur_path_len = pathconf(".", _PC_PATH_MAX)) == -1) { perror("Couldn't get current working path length"); return 1; } //print the path length printf("Current path length is %ld", cur_path_len); //Allocate memory for the array cur_work_dir if ((cur_work_dir = (char *) malloc(cur_path_len)) == NULL) { perror("Couldn't allocate memory for the pathname"); return 1; } //Get current working directory if (getcwd(cur_work_dir, cur_path_len) == NULL) { perror("Couldn't get current working directory"); return 1; } //Print the current work directory printf("Current working directory is %s", cur_path_len); //free the the memory free (cur_work_dir); //Get current file descriptor if ((fd = open(".", O_RDONLY)) == -1) { perror("Couldn't get current file descriptor"); } //change the current working directory if (chdir("..") == -1) { perror("Couldn't change the current working directory"); return 1; } //Allocate memory for the array cur_work_dir if ((cur_work_dir = (char *) malloc(cur_path_len)) == NULL) { perror("Couldn't allocate memory for the pathname"); return 1; } //Get current working directory if (getcwd(cur_work_dir, cur_path_len) == NULL) { perror("Couldn't get current working directory"); return 1; } //Print the current work directory printf("Current working directory is %s", cur_path_len); //free the the memory free (cur_work_dir); //Use the function fchdir(); if (fchdir(fd) == -1) { perror("functione fchdir error"); return 1; } //Allocate memory for the array cur_work_dir if ((cur_work_dir = (char *) malloc(cur_path_len)) == NULL) { perror("Couldn't allocate memory for the pathname"); return 1; } //Get current working directory if (getcwd(cur_work_dir, cur_path_len) == NULL) { perror("Couldn't get current working directory"); return 1; } //Print the current work directory printf("Current working directory is %s", cur_path_len); //free the the memory free (cur_work_dir); return 0; } |
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