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Annotation of researchv10dc/dist/man/v4/man3/ierror.3, revision 1.1

1.1     ! root        1: .th IERROR III 10/29/73
        !             2: .sh NAME
        !             3: ierror \*- catch Fortran errors
        !             4: .sh SYNOPSIS
        !             5: .ft B
        !             6: if ( ierror ( \fIerrno\fB ) .ne. 0 ) goto \fIlabel\fR
        !             7: .sh DESCRIPTION
        !             8: .it Ierror
        !             9: provides a way of detecting errors during the running of a Fortran
        !            10: program.
        !            11: Its argument is a run-time error number
        !            12: such as enumerated in
        !            13: .it fc
        !            14: (I).
        !            15: .s3
        !            16: When
        !            17: .it ierror
        !            18: is called,
        !            19: it returns a 0 value; thus the
        !            20: .bd goto
        !            21: statement in the synopsis is not executed.
        !            22: However, the routine stores inside itself the
        !            23: call point and invocation level.
        !            24: If and when the indicated error occurs,
        !            25: a
        !            26: .bd return
        !            27: is simulated from
        !            28: .it ierror
        !            29: with a non-zero value;
        !            30: thus the
        !            31: .bd goto
        !            32: (or other statement)
        !            33: is executed.
        !            34: It is a ghastly error to call
        !            35: .it ierror
        !            36: from a subroutine which
        !            37: has already returned when the error occurs.
        !            38: .s3
        !            39: This routine is essentially tailored to
        !            40: catching end-of-file situations.
        !            41: Typically it is called just before the start
        !            42: of the loop which reads the input file,
        !            43: and the
        !            44: .bd goto
        !            45: jumps to a graceful termination of the program.
        !            46: .s3
        !            47: There is a limit of 5 on the number
        !            48: of different error numbers which can be caught.
        !            49: .sh "SEE ALSO"
        !            50: fc (I)
        !            51: .sh BUGS
        !            52: There is no way to ignore errors.

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