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Full Discussion: how to avoid the segfault from Address 0x1cd00000103 out of bounds
Top Forums Programming how to avoid the segfault from Address 0x1cd00000103 out of bounds Post 302277358 by cdbug on Friday 16th of January 2009 04:38:00 AM
Old 01-16-2009
They are pointers. This is sure. But there is some mistakes in the code I gave before. The assignment should use * before the pointers. I am sorry for carelessness when posted. But when checking with 'while ( *( tr->root->is_done ) )', the same segfault happen. And corresponding pinter address still be 'out of bounds". In my code, such statements exist.

This is a package coded by a previous member. He habits to use such structure for varialbes which control execution. A large package means that it is not easy to change all the strutures of this kind.

What's more, I think this is really a topic worth discusssion.



Quote:
Originally Posted by otheus
"out of bounds" means "invalid memory address". You avoid it by properly mallocing memory before using it.

I hate to say this, but you seem very confused about pointers. I think you need to read a very concise summary on C pointers.

In the code you provide, you are trying to assign values to the address...
Code:
node->des = 0;

You should instead be doing:
Code:
*(node->des) = 0;
 
This correction is good. I losed stars when posted.

And your loop should be:
Code:
while ( *(  tr->root->is_done ) ) {
... 
}
 
At this situation, segfaults still happen

Also, root itself is a pointer. So you first need to allocate it:
Code:
tr->root = malloc(sizeof(struct node_t));
tr->root->hood = malloc(sizeof(double*));

"tr" is also a pointer, and this needs to be allocated too, but I have no idea what kind of structure it is.


Also, this structure is very unusual. I cannot imagine why you want every element to be a pointer to something!
 

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LEARN ABOUT DEBIAN

hdf_destroy

hdf_destroy(3)							  util/neo_hdf.h						    hdf_destroy(3)

NAME

       hdf_destroy  - deallocate an HDF data set

SYNOPSIS

       #include <util/neo_hdf.h>

       void hdf_destroy (HDF **hdf);

ARGUMENTS

       hdf - pointer to an HDF data set allocated with hdf_init

DESCRIPTION

       hdf_destroy  is	used  to  deallocate all memory associated with an hdf data set.  Although you can pass an HDF node as an argument to this
       function, you are likely to cause a segfault if you continue to access the data set.  In the future, we may restrict hdf_destroy so it only
       works on the top level node.

RETURN VALUE

       None

SEE ALSO

       hdf_set_symlink(3),  hdf_get_valuef(3),	compareFunc)(3),  hdf_dump_str(3),  hdf_get_int_value(3),  hdf_read_string_ignore(3), hdf_copy(3),
       hdf_get_node(3),  hdf_set_value(3),  hdf_obj_child(3),  hdf_read_string(3),   hdf_set_buf(3),   hdf_register_fileload(3),   hdf_get_obj(3),
       hdf_get_attr(3),  hdf_obj_top(3),  hdf_dump_format(3),  hdf_destroy(3),	hdf_init(3),  hdf_obj_value(3),  hdf_write_string(3), hdf_set_val-
       uevf(3), hdf_sort_obj(3), hdf_write_file_atomic(3), hdf_obj_attr(3), hdf_set_valuef(3),	hdf_get_copy(3),  hdf_write_file(3),  hdf_get_val-
       uevf(3),  hdf_set_int_value(3),	hdf_dump(3),  hdf_get_value(3),  hdf_set_copy(3),  hdf_obj_next(3),  hdf_search_path(3),  hdf_obj_name(3),
       hdf_set_attr(3), hdf_get_child(3), hdf_remove_tree

ClearSilver							   12 July 2007 						    hdf_destroy(3)
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