8.88 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