Linux系统惯用目录操作函数

参考《Linux程序设计》第二版P103

扫描目录：

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <dirent.h>#include <unistd.h>#include <sys/stat.h>void printdir(char *dir, int depth);int main(void){    printf("Directory scan of /home:\n");    printdir("/home", 0);    printf("Done.\n");    exit(0);}void printdir(char *dir, int depth){    DIR *dp;    struct dirent *entry;    struct stat statbuf;    if((dp = opendir(dir)) == NULL){        fprintf(stderr, "Can not open directory: %s.\n", dir);        return;    }    chdir(dir);    while((entry = readdir(dp)) != NULL){        lstat(entry->d_name, &statbuf);        if(S_ISDIR(statbuf.st_mode)){            if((strcmp(".", entry->d_name)==0)||(strcmp("..", entry->d_name) == 0)){                 continue;            }            printf("%*s%s/\n", depth, "", entry->d_name);            printdir(entry->d_name, depth+4);        }        else{            printf("%*s%s\n", depth, "", entry->d_name);        }    }    chdir("..");    closedir(dp);}

涉及的几个目录操作函数为：

（1） DIR *opendir(const char *name);

（2） struct dirent *readdir(DIR *dirp);

（3） int closedir(DIR *dirp);

（4） int chdir(const char *path);