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/GNU Fortran 7

9.110 FNUM — File number function

Description:

FNUM(UNIT) returns the POSIX file descriptor number corresponding to the open Fortran I/O unit UNIT.

Standard:

GNU extension

Class:

Function

Syntax:

RESULT = FNUM(UNIT)

Arguments:
UNIT The type shall be INTEGER.
Return value:

The return value is of type INTEGER

Example:
program test_fnum
  integer :: i
  open (unit=10, status = "scratch")
  i = fnum(10)
  print *, i
  close (10)
end program test_fnum

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/FNUM.html