Joachim Schmitz wrote: ... > Hmm DIR_TO_FD() is : > #define DIR_TO_FD(Dir_p) -1 > > In config.h: > /* the name of the file descriptor member of DIR */ > /* #undef DIR_FD_MEMBER_NAME */ > > #ifdef DIR_FD_MEMBER_NAME > # define DIR_TO_FD(Dir_p) ((Dir_p)->DIR_FD_MEMBER_NAME) > #else > # define DIR_TO_FD(Dir_p) -1 > #endif > > So fd_clone_dir() does not return NULL, but has errno set to ENTOSUP. > > > Our "struct DIR" has 2 shorts and one long, with funny names dd1, dd2 > and dd3... looking at their content: nothing looks like a proper fd > (values 7, 257 and 135067072, respectively) > > > Where to go now? > > Resorting to wild guesses, I tried all 3 members of struct DIR as > DIF_FD_MEMBER_NAME, no change to the EBADF
Write a small test program that opens say four directories, to get one DIR* pointer for each. Then print a table of the DIR member values. Maybe you'll see a pattern, i.e., how to derive an FD number from those dd1,2,3 fields.
