Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>First, for the love of all that is, well, lovable, <strong>don't use Dev-C++</strong>. I wish I knew how people keep running into that piece of junk. It hasn't been maintained for <em>years</em>, and even when it was maintained, it was still a buggy piece of junk that lacked very basic functionality. Ditch it, and go for one of the countless better free alternatives.</p> <p>Now, onto your question: Your program segfaults randomly because you've done something illegal earlier. Don't do that. ;)</p> <p>if your program writes out of bounds somewhere, anything might happen. It might hit an unallocated page, in which case you get a segfault. Or it might hit unused data on a page that is allocated to your process in which case it won't have any practical effect (unless it is properly initialized afterwards, overwriting your first, illegal, write, and you then try to read from it, expecting the original (invalid) value to still be there. Or it might hit data that's actually in use, in which case you'll get errors later, when the program tries to read that data.</p> <p>Pretty much the same scenarios exist when reading data. You can be lucky and get a segfault immediately, or you can hit unused and uninitialized memory, and read garbage data out (which will most likely cause an error later, when that data is used), or you can read from memory addresses that are already in use (which will also give you garbage out).</p> <p>So yes, these errors are tricky to find. The best advice I can give is to 1) sprinkle asserts all over your code to ensure basic invariants are maintained, and 2) step through the program, and at every step, verify that you're not reading or writing to addresses that don't belong to you.</p> <p>MSVC has a secure SCL option enabled by default which will perform bounds checking on STL code, which can help spotting errors like this.</p> <p>I believe GCC has an option to do something similar (but it's not enabled by default).</p> <p>Segfaults are nasty. Once people have been bitten by an error like this a few times, they tend to become a lot more disciplined with avoiding accessing memory out of bounds. :)</p>
    singulars
    1. This table or related slice is empty.
    1. POWhy am I getting segfaults randomly?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USjalf
    1. USjalf
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWhy am I getting segfaults randomly?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI've followed your advice and i'm now using Code::Blocks. Call stack added!
      singulars
      1. PO
      1. USAmokrane Chentir
    2. COIn the "C++ For Dummies" books the author recommends it.
      singulars
      1. PO
      1. USxian
    3. CO+1 segfault on any system ( Window, Unix(like), OpenVMS occured "long time ago" before the crash.
      singulars
      1. PO
      1. USLuc M
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload