How do I fix a core dump?

Resolving Segmentation Fault (“Core dumped”) in Ubuntu

1. Command-line:
2. Step 1: Remove the lock files present at different locations.
3. Step 2: Remove repository cache.
4. Step 3: Update and upgrade your repository cache.
5. Step 4: Now upgrade your distribution, it will update your packages.

What is core dump issue?

Core Dump/Segmentation fault is a specific kind of error caused by accessing memory that “does not belong to you.” When a piece of code tries to do read and write operation in a read only location in memory or freed block of memory, it is known as core dump. It is an error indicating memory corruption.

Why am I getting a Segmentation fault in C?

Segmentation faults are a common class of error in programs written in languages like C that provide low-level memory access. They arise primarily due to errors in use of pointers for virtual memory addressing, particularly illegal access.

Why Segmentation fault happens?

Overview. A segmentation fault (aka segfault) is a common condition that causes programs to crash; they are often associated with a file named core . Segfaults are caused by a program trying to read or write an illegal memory location.

What causes a segmentation fault in C-fclose?

After asserting that fp1 is NULL, you’re trying to call close on the null pointer, which will cause a segmentation fault. If all you want to do is verify that the file exists, try something like What’s the best way to check if a file exists in C? (cross platform) fopen returns a FILE pointer.

What happens if I Dont call fclose ( ) in a C program?

It will close any files you left open when it terminates your process, and perform any other cleanup that is necessary (e.g. if a file was marked delete-on-close, it will delete the file then; note that that sort of thing is platform-specific). However, another issue to be careful of is buffered data.

What happens when you call fclose when FP1 is null?

That’s normal, when you call fclose (fp1) when fp1 is NULL. is useless because you don’t assign the return value to a file pointer. That means the users.sav file will be opened for writing, but you will never be able to write anything in it . I’m not really sure what you’re trying to do, but the immediate problem is here:

When is the behaviour of C-fclose ( ) undefined?

The behaviour of fclose () is undefined if the stream parameter is an illegal pointer, or is a descriptor already passed to a previous invocation of fclose (). The error is in the if block in your code. Actually we will get to exit (1) even if checkfile is zero.