Very Computer

Hi,

I have a program doing the following, and I have
a shell script to run it in a loop of about 300 iterations.
I will get about 1 or two of "Bus error core dump" err(s), which
occurs around the free() function calls.

Anybody please give me some hint of why?

Thanks a lot.

Frank

-----psudo code start:

char *array[51];
FILE *f_out;
...
f_out = fpen(filename, "a");
for(i = 0; i < 50 ; i++)
{
        array[i] = (char *)malloc(1024);
        if(!array[i])
           ...

Quote:}

array[50] = 0;

connec_oracle();
select (list) into array from (table_joins);
process(array);
write(f_out, array);

for(i = 0; i < 50 ; i++)
{
        free(array[i]);

Quote:}

close(f_out);

A crash in free() is 99.999% probably the result of damage to the heap.
I'll bet that your program oversteps the boundary of one of your
allocated char arrays in array[].

--
                Fletcher Glenn

Quote:>Hi,

>I have a program doing the following, and I have
>a shell script to run it in a loop of about 300 iterations.
>I will get about 1 or two of "Bus error core dump" err(s), which
>occurs around the free() function calls.

>Anybody please give me some hint of why?

>Thanks a lot.

>Frank

>-----psudo code start:

>char *array[51];
>FILE *f_out;
>....
>f_out = fpen(filename, "a");
>for(i = 0; i < 50 ; i++)
>{
>    array[i] = (char *)malloc(1024);
>    if(!array[i])
>       ...
>}
>array[50] = 0;

>connec_oracle();
>select (list) into array from (table_joins);
>process(array);
>write(f_out, array);

>for(i = 0; i < 50 ; i++)
>{
>    free(array[i]);
>}

>close(f_out);