#include <cstdio>#include <cstring>#include <filesystem>#include <fstream>#include <iostream>#include <sys/socket.h>#include <sys/stat.h>#include <sys/un.h>#include <unistd.h> namespace fs= std::filesystem; void demo_status(const fs::path& p, fs::file_status s){std::cout<< p;// alternative: switch(s.type()) { case fs::file_type::regular: ...}if(fs::is_regular_file(s))std::cout<<" is a regular file\n";if(fs::is_directory(s))std::cout<<" is a directory\n";if(fs::is_block_file(s))std::cout<<" is a block device\n";if(fs::is_character_file(s))std::cout<<" is a character device\n";if(fs::is_fifo(s))std::cout<<" is a named IPC pipe\n";if(fs::is_socket(s))std::cout<<" is a named IPC socket\n";if(fs::is_symlink(s))std::cout<<" is a symlink\n";if(!fs::exists(s))std::cout<<" does not exist\n";} int main(){// create files of different kinds    fs::create_directory("sandbox");    fs::create_directory("sandbox/dir");std::ofstream{"sandbox/file"};// create regular file    fs::create_symlink("file","sandbox/symlink");     mkfifo("sandbox/pipe",0644);    sockaddr_un addr;    addr.sun_family= AF_UNIX;std::strcpy(addr.sun_path,"sandbox/sock");int fd= socket(PF_UNIX, SOCK_STREAM,0);    bind(fd,reinterpret_cast<sockaddr*>(&addr), sizeof addr); // demo different status accessorsfor(auto it{fs::directory_iterator("sandbox")}; it!= fs::directory_iterator();++it)        demo_status(*it, it->symlink_status());// use cached status from directory entry    demo_status("/dev/null", fs::status("/dev/null"));// direct calls to status    demo_status("/dev/sda", fs::status("/dev/sda"));    demo_status("sandbox/no", fs::status("/sandbox/no")); // cleanup (prefer std::unique_ptr-based custom deleters)    close(fd);    fs::remove_all("sandbox");}

"sandbox/file" is a regular file"sandbox/dir" is a directory"sandbox/pipe" is a named IPC pipe"sandbox/sock" is a named IPC socket"sandbox/symlink" is a symlink"/dev/null" is a character device"/dev/sda" is a block device"sandbox/no" does not exist