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/GNU Fortran 7

9.154 IS_IOSTAT_END — Test for end-of-file value

Description:

IS_IOSTAT_END tests whether an variable has the value of the I/O status “end of file”. The function is equivalent to comparing the variable with the IOSTAT_END parameter of the intrinsic module ISO_FORTRAN_ENV.

Standard:

Fortran 2003 and later

Class:

Elemental function

Syntax:

RESULT = IS_IOSTAT_END(I)

Arguments:
I Shall be of the type INTEGER.
Return value:

Returns a LOGICAL of the default kind, which .TRUE. if I has the value which indicates an end of file condition for IOSTAT= specifiers, and is .FALSE. otherwise.

Example:
PROGRAM iostat
  IMPLICIT NONE
  INTEGER :: stat, i
  OPEN(88, FILE='test.dat')
  READ(88, *, IOSTAT=stat) i
  IF(IS_IOSTAT_END(stat)) STOP 'END OF FILE'
END PROGRAM

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/IS_005fIOSTAT_005fEND.html