If you specify "'<&=N'", where "N" is a number, then Perl will do an equivalent of C's "fdopen" of that file descriptor; this is more parsimonious of file descriptors. For example:
open(FILEHANDLE, "<&=$fd")
でも Note that this feature depends on the fdopen() C library function. On many UNIX systems, fdopen() is known to fail when file descriptors exceed a certain value, typically 255. If you need more file descriptors than that, consider rebuilding Perl to use the "sfio" library.
