On 6/01/12 02:22, James Linder wrote:
>
> On 06/01/2012, at 5:07 AM, fink-beginners-requ...@lists.sourceforge.net wrote:
>
>> I have found of a problem of gnuplot under Mac OS X 10.6.
>>
>> I can't use a "load" command which read data thru a pipe more than once.
>>
>> For example, following code does not work;
>>
>> load "< echo 'plot sin(x)'"
>> load "< echo 'plot cos(x)'"
>>
>> After executing above code, the plot window for 'cos(x)' should remain.
>> But 'cos(x)' will not be plotted and the plotting of 'sin(x)' will stay
>> on the display.
>>
>> The gnuplot 4.4.x under Mac OS X 10.5 does not have such problem.
>>
>> Does anyone know the way to avoid this problem.
>
> linux version does work as expected, except you need to
> set term x11 persist
> for the window to remain open. Thus this is a mac-build and not a source-code
> issue (assuming
[]
My bet is that this is a gnuplot bug. In the load command, it uses
popen() to open a pipe for reading the output of the given shell
command, but it closes it using fclose() instead of pclose(), which is a
bug. This works purely by chance on linux and on MacOSX 10.5, but
doesn't work on MacOSX 10.6 and 10.7.
On MacOSX 10.5, where it 'works', if you issue several of these
load "< echo 'plot sin(x)'"
commands in gnuplot, you will see as many /bin/sh processes running.
They only quit when you quit gnuplot.
There is a simple patch that makes this work, but I don't know if it
interferes with other uses of the "load" command:
costabel% diff -U1 src/misc.c{~,}
--- src/misc.c~ 2012-01-06 12:34:07.000000000 +0100
+++ src/misc.c 2012-01-06 12:34:57.000000000 +0100
@@ -303,3 +303,3 @@
*/
- (void) fclose(lf->fp);
+ if (pclose(lf->fp)) (void) fclose(lf->fp);
}
--
Martin
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