gumstix

Do you want to know why there is a leak, or why linux is able to free memor=
y
!?

If you want to know where your code is wrong :
I will not tell you what is the problem, but I think following stuff will
help you :
Did you tried your stuff on your host system before ?
just an idea : Try looking how you open/close your files .. (and test your
FILE* before any read/write !!! if you don't like that, play with C++)

PS : I love waiting for 60 seconds to see the problem :)

2005/10/3, Terje.Utheim@... <Terje.Utheim@... >:
>
> This sequence is allocating (leaking) memory on the gumstix bit by bit
> until
> process is killed. Memory returned when aborted. What is wrong ?
>
> #include <stdlib.h>
> #include <unistd.h>
> #include <stdio.h>
> #include <sys/types.h>
> #include <fcntl.h>
> #include <string.h>
> #include <errno.h>
> #include <sys/stat.h>
> main()
> {
> int i;
> unsigned char blk[4096];
> FILE *rng;
> for(i=3D0;i<4096;i++)
> blk[i]=3Di;
> rng=3Dfopen("/mnt/cf/slg/rng/test0","w+");
> if(rng =3D=3D NULL)
> {
> exit(0);
> }
> for(;;)
> {
> for(i=3D0;i<60;i++)
> {
> printf("%3d\n",i);
> fwrite(&blk,4096, 1, rng);
> fflush(rng);
> sleep(1);
> }
> fclose(rng);
>
> rng=3Dfopen("/mnt/cf/slg/rng/test1","w+");
>
> if(rng =3D=3D NULL)
> {
> exit(0);
> }
> for(i=3D0;i<60;i++)
> {
> printf("%3d\n",i);
> fwrite(&blk,4096, 1, rng);
> fflush(rng);
> sleep(1);
> }
> fclose(rng);
> }
> }
>
>
>
>
> -------------------------------------------------------
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>



--
J=E9r=F4me Multrier
TinyCoach, un projet KaliBee

In the for(;;) loop, your writing to a closed fle in everything but the
first pass. That can't be good.

nav

On Mon, 3 Oct 2005 Terje.Utheim@... wrote:

> This sequence is allocating (leaking) memory on the gumstix bit by bit until
> process is killed. Memory returned when aborted. What is wrong ?
> 
>  #include <stdlib.h>
> #include <unistd.h>
> #include <stdio.h>
> #include <sys/types.h>
> #include <fcntl.h>
> #include <string.h>
> #include <errno.h>
> #include <sys/stat.h>
> main()
> {
>   int i;
>   unsigned char blk[4096];
>   FILE *rng;
>   for(i=0;i<4096;i++)
>     blk[i]=i;           
>   rng=fopen("/mnt/cf/slg/rng/test0","w+");
>   if(rng == NULL)
>   {
>     exit(0);
>   }
> for(;;)
> {
>   for(i=0;i<60;i++)
>   {
>     printf("%3d\n",i);
>     fwrite(&blk,4096, 1, rng);
>     fflush(rng);
>     sleep(1);
>   }
>   fclose(rng);
> 
>   rng=fopen("/mnt/cf/slg/rng/test1","w+");
> 
>   if(rng == NULL)
>   {
>     exit(0);
>   }
>   for(i=0;i<60;i++)
>   {
>     printf("%3d\n",i);
>     fwrite(&blk,4096, 1, rng);
>     fflush(rng);
>     sleep(1);
>   }
>   fclose(rng);
> }
> }
> 
> 
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by:
> Power Architecture Resource Center: Free content, downloads, discussions,
> and more. http://solutions.newsforge.com/ibmarch.tmpl
> _______________________________________________
> gumstix-users mailing list
> gumstix-users@...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>

Hello Terje

As it was suggested before you are missing an fopen within the for(;;) 
part of the program and this will be giving you problems in each pass 
through the loop (not only the first as it was suggested in another 
messsage).

But what do you mean leak? Have you checked for leaks with valgrind or 
do you get some message when the program terminates?

thanOS

at the end of your main loop you close your file stream, the next 
iteration tries to write to it again without first checking if its open.

-Jeffrey



Terje.Utheim@... wrote:
> This sequence is allocating (leaking) memory on the gumstix bit by bit until
> process is killed. Memory returned when aborted. What is wrong ?
> 
>  #include <stdlib.h>
> #include <unistd.h>
> #include <stdio.h>
> #include <sys/types.h>
> #include <fcntl.h>
> #include <string.h>
> #include <errno.h>
> #include <sys/stat.h>
> main()
> {
>   int i;
>   unsigned char blk[4096];
>   FILE *rng;
>   for(i=0;i<4096;i++)
>     blk[i]=i;           
>   rng=fopen("/mnt/cf/slg/rng/test0","w+");
>   if(rng == NULL)
>   {
>     exit(0);
>   }
> for(;;)
> {
>   for(i=0;i<60;i++)
>   {
>     printf("%3d\n",i);
>     fwrite(&blk,4096, 1, rng);
>     fflush(rng);
>     sleep(1);
>   }
>   fclose(rng);
> 
>   rng=fopen("/mnt/cf/slg/rng/test1","w+");
> 
>   if(rng == NULL)
>   {
>     exit(0);
>   }
>   for(i=0;i<60;i++)
>   {
>     printf("%3d\n",i);
>     fwrite(&blk,4096, 1, rng);
>     fflush(rng);
>     sleep(1);
>   }
>   fclose(rng);
> }
> }
> 
> 
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by:
> Power Architecture Resource Center: Free content, downloads, discussions,
> and more. http://solutions.newsforge.com/ibmarch.tmpl
> _______________________________________________
> gumstix-users mailing list
> gumstix-users@...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users

-- 
Jeffrey Kacmarcik
Associate Information Processing Consultant
College Library - Computer & Media Center
jkacmarcik@...
608 263-4540