Re: a question on du.c and df.c rather than a statement of a bug

[Eric Blake]

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Please keep replies on the list.

According to )\(@sS on 3/14/2007 9:54 AM:
> thank you
> for your quick reply. no the application is not planned to be
> distributed. it is just a memory management routine that will be
> deleting files from a folder once a certain space is exceeded. it will
> be integrated in an embedded system. which will be used for research
> purposes within the university.
> 
> im trying to use directly df and du because the scope is to make a
> controller, not a memory managing module. i just wanted to extract the
> output directly from du "as is". the question is if you can easily
> identify some pitfalls in using the 2 sources in parallel.
> 
> i will look into coreutils. however since the 2 applications where
> designed separately as you say i feel the problems will persist.
> 
> basically i have generated files foldersize.c and diskspace.c (which i
> #include from my code) that prepare the option with which the du.o and
> df.o respectively will be called:
> 
> foldersize.c_______________________________________
> 
> #include <stdio.h>
> #include <stdlib.h>
> ///#if HAVE_INTTYPES_H/
> # include <inttypes.h>
> ///#endif/
> 
> #include <stdio.h>
> #include <getopt.h>
> #include <sys/types.h>
> #include <assert.h>
> 
> ///void exit(int status);/
> ///using namespace std;/
> 
> unsigned long tot_size =0;// variable is declared here and declared as extern 
> in du.c
> 
> unsigned long getFolderSize(char *path) {
> 
>   unsigned long folder_size =0;
>   char **koko = malloc(*sizeof*(char*) * 30);
>   koko[0] = "du";
>   koko[1] = "-s";
>   koko[2] = path;
> ///printf("path = %s\n",koko[2]);/
>   ///du_proc (3, koko);/
>   tot_size = 1;
>   folder_size = tot_size ;
>   printf ("=> %d\n",tot_size);
>   *return* (folder_size);
>   ///exit(0);/
> }
> 
> 
> diskspace.c_______________________________________
> 
> #include "diskspace.h"
> #include <stdio.h>
> #include <stdlib.h>
> double pct = -1;
> int foo=0;
> unsigned long available;//declared here and as extern in df.c
> ///void exit(int status);/
> 
> unsigned long int getDiskSpace()
> {
>       unsigned long int available_MB=0;
> 
>       char *temp=(char*)malloc(10);
>       char **koko = &temp;
>       koko[0] = "";
>       koko[1] = MY_DISK;//MY_DISK is #defined as "/dev/nand" in diskspace.h
> 
>       df (2, koko);
>       available_MB = (available*);
> 
>       *return* (available_MB);
> 
> }

If you expect help debugging your code, post code that will compile, not
pseudocode.  Otherwise, I repeat my claim that you are probably the best
person to debug this.

> 
> 
> to generate df.o and du.o i used the gcc call "as is" from the Makefile
> that came with the package, but i only did the compiling step - not the
> linking.
> 
> then i compile my code
> 
> <compiling files>
> 
> 
> *gcc* -c -g diskspace.c -o diskspace.o
> *gcc* -c -g foldersize.c -o foldersize.o
> 
> <compiling some more files>
> 
> then i link as
> 
> g++ -g <object files> df.o du.o diskspace.o foldersize.o <more object files> 
> -o controller -I. -L. -lrt -lfetish
> 
> 
> .
> Thank you for your help
> nass
> 
> 

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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