ferror and feof segmentation fault

nc3b · 07-22-2007, 05:52 AM

Hello. I have a strange problem.. I have the following code:

Code:

if(rx==NULL)
{
  //bla bla
}
else
{
    if(ferror(rx) || feof(rx))
    {
        //bla bla
    }
}

And it fails on ferror with sigsev. And if I take out ferror, I it fails on feof. It's the first case of ferror or feof failing like that.. In the man page they say

Quote:

These functions should not fail

I am really confused, as the problem only came up recently after making some changes that DO NOT relate in any way with this piece of code. And I don't have a working copy of the program, the newest is ages old.. Can anyone help?

wjevans_7d1@yahoo.co · 07-22-2007, 08:07 AM

These functions are likely to fail if something elsewhere in the program is stomping on *rx.

If you put that snippet of code in a tiny test program, you'll probably find that it works.

In the full body of code, it fails.

The changes that do not relate in any way to this code probably contain a bug that steps on *rx.

Your job is most likely to see what steps on *rx and why.

Hope this helps.

Wim Sturkenboom · 07-22-2007, 08:07 AM

What is rx (how declared)? Is it already opened?

nc3b · 07-22-2007, 11:32 AM

Thanks guys. I solved this one, wjevans was right, something was trashing rx.