fdopendir (BUG?)

[Jorge Almeida <jjalmeida@gmail.com>]

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Calling fdopendir with a file descriptor obtained with O_PATH yields a
bad directory  stream descriptor (as it should, if I understood
correctly the documentation of open() re O_PATH). However, the call
doesn't fail (it should fail with EBADF). A subsequent call to readdir
(3) detects the error.

(the problem also occurs with glibc, besides the fact that glibc
requires also _GNU_SOURCE to compile, contradicting  the linux man
page)

Am I  missing something? (Complete test program in attachement, so
that Gmail doesn't crap it.)

Thanks,

Jorge Almeida

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#define _POSIX_C_SOURCE 200809L
//#define _GNU_SOURCE
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>

/* "somedir" should be an existing subdirectory of the current directory */

int main(int argc, char* argv[]){
		int fd=open("somedir", O_RDONLY|O_PATH|O_DIRECTORY);
//		int fd=open("somedir", O_RDONLY|O_DIRECTORY);
		if(fd == -1){
				fprintf(stderr, "open: %d\n", errno);
				exit(1);
		}
		DIR* dir=fdopendir(fd);
//		DIR* dir=opendir("somedir");
		if(dir == NULL){
				fprintf(stderr, "fdopendir: %d\n", errno);
				exit(1);
		}
		struct dirent* de;
		errno=0;
		de=readdir(dir);
		if(de == NULL && errno){
				fprintf(stderr, "readdir: %d\n", errno);
				exit(1);
		}
}