rabotin wrote:
> Dear all,
> I'm trying to launch a grass work with a script to automate calcul.
> I try successfully with calling a shell script with GRASS_BATCH_JOB
> parameter (which call the test_algo.sh)
> with the following shell script
>
> #!/bin/bash
> chmod u+x $HOME/test_algo.sh
> export GRASS_BATCH_JOB=$HOME/test_algo.sh
> grass ~/grassdata/Roujan/simon9/
> unset GRASS_BATCH_JOB
>
> I'm trying now to do the same thing with a c++ program which call the
> same shell script (test_algo.sh) and having the following lines (here
> the .cpp file):
>
> #include <stdio.h>
> #include <stdlib.h>
>
> const char chmod[]="chmod u+x /home/rabotin/test_algo.sh";
> const char expor[]="export GRASS_BATCH_JOB=/home/rabotin/test_algo.sh";
> const char grass[]="grass -text ~/grassdata/Roujan/simon9/";
> const char unset[]="unset GRASS_BATCH_JOB";
>
> int main()
> {
> printf ("Launching grass test!");
> system(chmod);
> system(expor);
> system(grass);
> system(unset);
> printf ("Launched grass test!");
>
> return 0;
> }
>
>
> But it doesnt' work well: GRASS is well launched, but no call to
> test_algo.sh and GRASS doesnt' end successfully
>
> Can anyone have any idea to help me ?
Environment variables are per-process. Each system() call spawns a new
shell process, and the export command will only affect the process in
which it's run, not any other processes. From a C/C++ program, use
putenv() instead, e.g.:
system(chmod);
putenv("GRASS_BATCH_JOB=/home/rabotin/test_algo.sh");
system(grass);
--
Glynn Clements <gl...@gclements.plus.com>
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