Question

I’m new to Linux & codeblocks. When building the code below i receive this error:

“segmentation fault process returned 139 (0x8b)”

I know it has something to do with memory but I cannot find the problem. While compiling the files with a Makefile or separately in the terminal I don’t receive any errors.

The main receives 2 arguments (argv) ComputersInNet.txt - > argv[1] Simulation.txt -> argv[2]

AND I cannot figure out how I add these files to the project using codeblocks, ALSO in Windows (Visual Basic) the codes works perfectly.

I couldn’t paste the codes correctly (5 files: 2 .h and 3 .cpp) you can download them from the link below, including both txt files I use as arguments.

http://depositfiles.com/files/cv2bwmz74

Answer 1

The code snippet problem is occured, subroutine Create_PC_List() is invoked from main() to create a list of computers.

void Router :: Create_PC_List (char *fname) //Reads from file & creates list of computers
{
char C;
char* IPAD=NULL;
FILE* fp;
FILE* msg;
int counter=0;
fp = fopen (fname,"r"); //Reading from Argv parameter file - list of computers in the network
if(fp == NULL)
        cout << "Opening file failed: %s\n" << strerror(errno) << endl;
msg = fopen (fname, "r"); //Reading from Argv parameter file - list of computers in the network
    while((C=fgetc(fp)) != EOF) //Running trougth the file
{
    ...

Output:

Opening file failed: No such file or directory
followed  by segmentation fault.

We could see fopen() failed with error "No such file or directory". Therefore, you need find a way to add three text files to Code Blocks an made available for fopen().

Secondly reason for the segmentation fault is fp provided to getc() is a FILE * pointer containing a NULL address that is not a valid FILE object.