Question about event handling in pm terminal

[Ethan M. <merritt@u.washington.edu>]

The structure gnuplot uses for event handling is defined in mousecmn.h 

struct gp_event_t {
    int type;           /* see below */
    int mx, my;         /* current mouse coordinates */
    int par1, par2;     /* other parameters, depending on the event type */
    char text[100];     /* literal command string for type=GE_cmd */
};


As of this morning, there are exactly zero uses of text[] in gnuplot
code, and no instances that generate event types GE_stderr, GE_stdout,
or GE_cmd.

I propose to remove all of these, but there is one bit of OS2-specific
code that puzzles me.  At the very end of src/gpexecute.c is this:

/* OS/2 communication via shared memory; coded according to gp_execute() */
#ifdef OS2_IPC                  
    if (input_from_PM_Terminal == NULL)
        return;
    ((char *) input_from_PM_Terminal)[0] = '%';
    /* copy the command to shared memory */
    memcpy(((char *) input_from_PM_Terminal) + 1, &ge, sizeof(ge));
    if (pausing) {              /* no communication during pause */
        /* DosBeep(440,111); */
        ((char *) input_from_PM_Terminal)[0] = 0;
        return;
    }
    gp_post_shared_mem();
#endif

Who is at the other end of this communication channel?
Does it go to some external program that thinks it knows sizeof(gp_event_t)?
Is struct gp_event_t (including the 100 char text field) a native
structure in OS2 that gnuplot tries to be compatible with?

Petr:

Could you check whether the attached small patch removing unused
commands and text array breaks the pm terminal?


-- 
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center
Mailstop 357742
University of Washington, Seattle, WA 98195