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Annotation of 3BSD/new/libI77uc/NEWS, revision 1.1

1.1     ! root        1: Update info on the f77 I/O lib.                15 Feb., 1980
        !             2: 
        !             3: 1) All instances of:
        !             4:        if(!init) f_init();
        !             5:    have been removed. f_init() is called from main.c on startup in the new
        !             6:    libF77.a .
        !             7: 
        !             8: 2) Backspace now allows non-seek files to reset the EOF flag.
        !             9: 
        !            10: 3) The way SIGINT is handled in libF77/main.c has been changed.
        !            11:    If the signal is not SIG_DFL, it is left alone as otherwise the
        !            12:    program will be killed if run in the background and the user types DEL.
        !            13: 
        !            14: 4) The ANSI fortran standard requires that I/O routines return to the caller
        !            15:    on any error condition if iostat= is specified even if no err= or end=
        !            16:    trap is specified. The implication of this is that the program must
        !            17:    be prepared to deal with ALL I/O errors if iostat= is specified.
        !            18:    If only one trap is specified, end= for example, the program must test the
        !            19:    iostat variable for positive/non-zero after the I/O call since return
        !            20:    will occur on any error. This seems awkward and I've chosen to make this
        !            21:    feature optional. I am interested in other views on this.
        !            22:    
        !            23:    In the current version of the compiler (using the modified io.c),
        !            24:    iostat= is used only to return status information from
        !            25:    I/O calls but does not itself cause return on any I/O error. Only
        !            26:    the traps, err= and end=, will cause a return/branch, and only for
        !            27:    the specified trap(s).
        !            28:    
        !            29:    This feature has been made a compile time option in the current version
        !            30:    of (modified) io.c It implements the standard correctly if compiled
        !            31:    with -DKOSHER or -DIOSRETURN. Otherwise it executes as currently
        !            32:    implemented.

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