如何在 C 中使用 open() function 打开目录？

Question

I want to open a directory without using <dirent.h>. I tried this:

#include <fcntl.h>

int fd = open("dir", O_RDONLY, 0);

But it returns fd = -1. Why? As I know, the directory is a file too, it just stores the location of children files and directories.

Answer 1

You can open directories with open, but what you probably want is the function opendir .

You will benefit from reading the manual page for open, especially the parts about O_PATH and O_DIRECTORY .

To learn the details of the directory reading ABI, read the source of opendir/readdir in your C library.