how to view a core dump file

Applications Programming
1

by what name does a core dump file stored???

like i wrote a test code:

//dump.c

main()
{
char *p=NULL;
printf("%s",p);
}

of course the above code will produce a segmentation fault. but i cant see any file named core in my CWD. am using SUN0S 5.9

2

You have some very strange behavior if that causes a segfault.

3

whats so strange about it buddy. Of course trying to dereference a NULL pointer will cause a SEGMENTATION FAULT.

4

See this article you will need "more coding" in your C program to generate core dumps.

5

am not able to open that link. guess it has been removed. can you tell me this "do all segmentation call produce core dump". if NO, then when will a segmentation fault produce a core dump

6

I can open that link fine. :confused:

Dereferencing a null pointer is illegal, but illegal behavior does not have guaranteed results. It may or may not cause a core dump.

7

I'll instruct you despite your tone.
That's not an invalid memory location (your NULL pointer is a misleading term), it's a pointer to type char assigned NULL. There is a valid memory location assigned to this pointer but no additional storage has been allocated. Thus the assignment of NULL and the printing of the assignment is perfectly legal.

printf("Pointer at %p and value assigned =%s\n",&p,p);

Perhaps this is what you meant to say would segfault as it is a dereference.

printf("%c",*p);