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Annotation of 3BSD/new/libI77uc/NEWS, revision 1.1.1.1

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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