Re: Maximum file descriptor number in select()?

[Gregory Nutt]

In NuttX, the current number of file descriptions is held in the 
fl_rows field of struct filelist.  Access to that field is provided 
only through the /proc file file system.

Hmm.. the test is

  if (row * CONFIG_NFILE_DESCRIPTORS_PER_BLOCK > OPEN_MAX)
    {
      return -EMFILE;
    }

So the current number of file descriptions must be 
CONFIG_NFILE_DESCRIPTORS_PER_BLOCK * fs_rows ???