Well, you're going to run out of new and interesting ways to cause it soon, I'm sure...
It's not a UNIX thing, either. You'd be getting these same crashes on Windows for the same reasons, though it might call them something else.
What "segmentation fault" means is you're trying to use memory you don't have. Of all possible addresses from 0 to 0xffffffff (on 32-bit) only a small bit of those are actually valid -- those your program has asked for or been granted on load.
Code:
char output[4000000][1000];
That's a three gigabyte variable! Almost four, even. There's no way the system is going to let you have a local variable so big. On a 32-bit system it might not even be possible to get that much memory in one process by any means. So when it tries, it reaches gigabytes beyond the maximum address the OS is willing to give it, and bingo: segmentation fault.
Try something a little more modest. char output[1024][1024]; That's exactly one megabyte.
---------- Post updated at 10:00 PM ---------- Previous update was at 09:26 PM ----------
Code:
std::cout << output[cnt] << "\n" << endl;
This is redundant since the strings read in by fgets() already have a \n on the end.
Code:
std::cout << output[cnt];
Last edited by Corona688; 12-20-2010 at 11:39 PM..
hello all,
I tried a program on an array to intialise array elements from the standard input device.it is an integer array of 5 elements.but after entering the 4th element it throws a message called "Segmentation Fault" and returns to the command prompt without asking for the 5th element.
... (3 Replies)
I have written a program which takes a directory as command line arguments and displays all the dir and files in it.
I don't know why I have a problem with the /etc directory.It displays all the directories and files untill it reaches a sub directory called peers which is in /etc/ppp/peers.the... (4 Replies)
ive written my code in C for implementation of a simple lexical analyser using singly linked list hence am making use of dynamic allocation,but when run in linux it gives a segmentation fault is it cause of the malloc function that ive made use of????any suggestions as to what i could do???
thank... (8 Replies)
Hi ,
During execution a backup binary i get following error
"Program error 11 (Segmentation fault), saving core file in '/usr/datatools"
Riyaz (2 Replies)
Hi,
Why I don't receive a segmentation fault in the following sample.
int main(void)
{
char buff;
sprintf(buff,"Hello world");
printf("%s\n",buff);
}
If I define a buffer of 10 elements and I'm trying to put inside it twelve elements, Should I receive a sigsev... (22 Replies)
Hi,
While comparing primary key data of two tables thr bteq script I am getting this Error. This script is a shell script.
*** Error: The following error was encountered on the output file.
Script.sh: 3043492 Segmentation fault(coredump)
Please let me know how to get through it.
... (5 Replies)
Hi,
I am having this segmentation fault not in the following program, bt. in my lab program . My lab program is horrible long so cannot post it here bt. I am using the following logic in my program which is giving the segmentation fault. Bt. if I run this sample program as it is it dosen't give... (3 Replies)
I use a binary name (ie polo) it gets some parameter , so for debugging normally i do this :
i wrote script for watchdog my app (polo) and check every second if it's not running then start it , the problem is , if my app , remain in state of segmentation fault for a while (ie 15 ... (6 Replies)
this is a network programming code to run a rock paper scissors in a client and server.
I completed it and it was working without any error. After I added the findWinner function to the server code it starts giving me segmentation fault.
-the segmentation fault is fixed
Current problem -Also... (3 Replies)
Oddities with gcc, 2.95.3 for the AMIGA and 4.2.1 for MY current OSX 10.14.1...
I am creating a basic calculator for the AMIGA ADE *NIX emulator in C as it does not have one.
Below are two very condensed snippets of which I have added the results inside the each code section.
IMPORTANT!... (11 Replies)
Discussion started by: wisecracker
11 Replies
LEARN ABOUT LINUX
inb_p
OUTB(2) Linux Programmer's Manual OUTB(2)NAME
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O
DESCRIPTION
This family of functions is used to do low-level port input and output. The out* functions do port output, the in* functions do port
input; the b-suffix functions are byte-width and the w-suffix functions word-width; the _p-suffix functions pause until the I/O completes.
They are primarily designed for internal kernel use, but can be used from user space.
You compile with -O or -O2 or similar. The functions are defined as inline macros, and will not be substituted in without optimization
enabled, causing unresolved references at link time.
You use ioperm(2) or alternatively iopl(2) to tell the kernel to allow the user space application to access the I/O ports in question.
Failure to do this will cause the application to receive a segmentation fault.
CONFORMING TO
outb() and friends are hardware-specific. The value argument is passed first and the port argument is passed second, which is the opposite
order from most DOS implementations.
SEE ALSO ioperm(2), iopl(2)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1995-11-29 OUTB(2)
12-21-2010
There's no way the system is going to let you have a local variable so big. On a 32-bit system it might not even be possible to get that much memory in one process by any means. So when it tries, it reaches gigabytes beyond the maximum address the OS is willing to give it, and bingo: segmentation fault.