Lahey/GNU Fortran

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8.87 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