Hi Keppler,
You should put something like:
struct vm_area_struct *tail_vma = NULL;
tail_vma = get_gate_vma(tsk);
// iterate over the vma
while (vma && (vma != tail_vma)) {
...
}
For more details you can check how the m_start() and m_next() functions
handle VMAs on fs/proc/task_mmu.c file.
BR,
Mauricio Lin.
--- Keppler Alecrim <alecrim@xxxxxxxxx> escreveu:
> Hi all ,
> I'm studying vma.This is my proc_read function and I want to
> return vma
> list information related with a current task. But , the loop(while
> (vma))
> does not stop.What is wrong ?
> Can anyone help me ?
>
> int my_get_info( char *buf, char **start, off_t off, int count )
> {
> struct task_struct *tsk = current;
> struct vm_area_struct *vma;
> unsigned long ptdb;
> int i = 0, len = 0;
>
> // display title
> len += sprintf( buf+len, "\n\nList of the Virtual Memory
> Areas " );
> len += sprintf( buf+len, "for task \'%s\' ", tsk->comm );
> len += sprintf( buf+len, "(pid=%d)\n", tsk->pid );
>
> // loop to traverse the list of the task's vm_area_structs
> vma = tsk->mm->mmap;
> while ( vma )
> {
> char ch;
> len += sprintf( buf+len, "\n%3d ", ++i );
> len += sprintf( buf+len, " vm_start=%08lX ",
> vma->vm_start
> );
> len += sprintf( buf+len, " vm_end=%08lX ",
> vma->vm_end );
>
> ch = ( vma->vm_flags & VM_READ ) ? 'r' : '-';
> len += sprintf( buf+len, "%c", ch );
>
> ch = ( vma->vm_flags & VM_WRITE ) ? 'w' : '-';
> len += sprintf( buf+len, "%c", ch );
>
> ch = ( vma->vm_flags & VM_EXEC ) ? 'x' : '-';
> len += sprintf( buf+len, "%c", ch );
>
> ch = ( vma->vm_flags & VM_SHARED ) ? 's' : 'p';
> len += sprintf( buf+len, "%c", ch );
>
> vma = vma->vm_next;
> }
> len += sprintf( buf+len, "\n" );
> // display additional information about tsk->mm
> asm(" movl %%cr3, %%ecx \n movl %%ecx, %0 " : "=m" (ptdb) );
> len += sprintf( buf+len, "\nCR3=%08lX ", ptdb );
> len += sprintf( buf+len, " mm->pgd=%p ", tsk->mm->pgd );
> len += sprintf( buf+len, " mm->map_count=%d ",
> tsk->mm->map_count );
> len += sprintf( buf+len, "\n\n" );
>
> return len;
>
> }
>
> My code is based on : http://www.cs.usfca.edu/~cruse/cs635/vma.c
>
> --
> --
> Francisco Keppler Silva Alecrim
> Instituto Nokia de Tecnologia (INdT)
> Open Source Mobile Research Center (OSMRC)
>
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