获取当前目录getcwd，设置工作目录chdir，获取目录信息

#include <unistd.h>
#include <stdio.h>
#include <limits.h>

int main(int argc, char* argv[])
{
    char buf[PATH_MAX];

    getcwd(buf, PATH_MAX-1);

    printf("the current path is :%s\n", buf);

    return 0;
}

设置工作目录：

#include <unistd.h>

int chdir(const char *path);
int fchdir(int fd);

chdir() changes the current working directory of the calling process to the directory specified in path.

fchdir() is identical to chdir(); the only difference is that the directory is given as an open file descriptor.

-----------------------------------

只要对目录有读写权限，就可获取目录信息。

打开目录：opendir

读取目录: readdir

关闭目录：closedir

DIR *opendir(const char *name);
DIR *fdopendir(int fd);

struct dirent *readdir(DIR *dirp);

int closedir(DIR *dirp);

#include <sys/types.h>
#include <dirent.h>
#include <stdlib.h>
#include <stdio.h>

int my_readdir(const char* path)
{
    DIR *dirp;
    struct dirent *ptr;

    if ( (dirp=opendir(path)) == NULL)
    {
        return -1;
    }

    while( (ptr=readdir(dirp)) != NULL)
    {
        printf("file name is:%s\n", ptr->d_name);
    }

    return 0;
}

int main(int argc, char* argv[])
{

    if (argc < 2)
    {
        exit(0);
    }

    if(my_readdir(argv[1])  < 0)
    {
        exit(0);
    }

    return 0;
}