Re: gnuplot and DISPLAY

[Daniel J S. <dan...@ie...>]

Ethan A Merritt wrote:
> On Thursday 08 March 2007 21:59, Daniel J Sebald wrote:
> 
>>Oh yeah, I see now.  That isn't the same error message as 
>>when gnuplot can't find gnuplot_x11.  gnuplot_x11 is the one having 
>>problems opening the X display.  Is there some way for Allin to 
>>confirm that the version of gnuplot_x11 for 4.2 was installed properly 
>>and it is not the 4.0 version of gnuplot_x11?    
> 
> 
> Doesn't matter.  No matter how badly gnuplot_x11 dies, it shouldn't
> do more than generate an error message on the gnuplot end.
> Apparently that's not the case, but I haven't yet understood the
> failure path.

Yeah, that's right.  Well, there are a number of conditional compiles in X11_init() that would explain that behavior.  There appears to be only one "graceful" exit out of gnuplot from that point:


	if (fork() == 0) {
	    /* child */
[snip]
	    fprintf(stderr,"Expected X11 driver: %s\n",X11_full_command_path);
	    perror("Exec failed");
	    fprintf(stderr,"See 'help x11' for more details\n");
	    exit(EXIT_FAILURE);
	}

But that set group of error messages isn't appearing in Allin's strace.

Might it be that fork() is coming back nozero and gnuplot attempts sending through the pipe and the OS doesn't like that so kills the process?

Dan