Advertisements The code: #include <list> #include <thread> #include <sys/poll.h> struct xsk_ring_stats { unsigned long rx_frags; unsigned long rx_npkts; unsigned long tx_frags; unsigned long tx_npkts; unsigned long rx_dropped_npkts; unsigned long rx_invalid_npkts; unsigned long tx_invalid_npkts; unsigned long rx_full_npkts; unsigned long rx_fill_empty_npkts; unsigned long tx_empty_npkts; unsigned long prev_rx_frags; unsigned long prev_rx_npkts; unsigned long prev_tx_frags; unsigned long prev_tx_npkts; unsigned… Read More Segfault on the code below, where is the error?

Advertisements Why am I getting segmentation fault here? #include <stdio.h> int main() { printf("enter the first number: "); int a; scanf("%d\n",a); int *pa = &a; printf("enter the second number: "); int b; scanf("%d\n",b); int *pb = &b; int *sum = *pa + *pb; printf("the sum of the given numbers is %d\n", sum); return 0; }… Read More Why am I getting segmentation fault for the pointer here?

Advertisements I’m new to C, trying to learn it by coding real things instead of isolated and naive book examples. I’m struggling a lot with understanding pointers correctly. My books aren’t really helping. I’ve got an array of pointers which i’m initializing the following way: struct Node **cols; cols = (struct Node *) calloc(N_RESTRICTIONS, sizeof(struct… Read More How to initialize a 2d array of pointers to point to the same pointers as another given one

Advertisements I’m working on a GDB project for class an I’m finding issues with a segfault portion in a piece of code that reads a file and creates a matrix with the input. GDB brings me to the "printf("%.2d\t", mat[row][col]);" in printMatrix() but I can’t seem to grasp what exactly goes wrong. int main(int argc,… Read More Segmentation Fault Issue in Matrix GDB Project

Advertisements Segfault on accessing pointers I’m developing simple GTK3 C app (using WSL2 and VSCode), but when I try to deserialize structs from file I’m getting Segfault (I’m not really familiar with gdb, so when I tried to debug I couldn’t really find the line which causes error). My Code Struct definition typedef struct whatev… Read More How to overcome Segfault on accessing pointer to array

Advertisements I’m still a beginner in C, but as training I would like to create a Password Manager(a very bad on though). First a .txt file is created, and then the user is given an option of what they would like to do next. Using strcmp I make the program decide what function to execute… Read More C gives segmentation fault and a warning for two different lines. What can I do to solve this issue?

Advertisements I wrote a code to reverse a string using recursion. When I run it, I get a segmentation error. #include <stdio.h> void _print_rev_recursion(char *s); int main() { _print_rev_recursion("string reversal"); return (0); } void _print_rev_recursion(char *s) { if (!*s) return; _print_rev_recursion(s++); putchar(*s); } When I changed s++ to s + 1, the code works. I… Read More Difference between ptr++ and ptr + 1

Advertisements I have a function what creates a vector, does somthing with it and then return it as an rvalue using std::move. When I am assigning it to a variable, I’m expecting to call std::vector‘s move constructor std::vector::vector(vector&&). But I’m getting a segmentation fault. Here’s my code: #include <iostream> #include <vector> std::vector<int>&& getVector(int start) {… Read More C++ returning an rvalue doesn't work and segfault

Advertisements I’m trying to transform a vector of strings to a vector of pairs of strings, and I was getting segfault. I’ve tried to narrow it down to a simple test case (below), and I’m sure it’s likely to do with the memory allocation: #include <string> #include <vector> #include <utility> std::pair<std::string, std::string> newP( const std::string&… Read More std::pair returned by std::transform resulting in segfault

Advertisements I tried to figure out why I always get a segmentation fault in my program which is part of an exercise, number 4-10, in The C Programming Language book of K&R. I’ve implemented every function as it was teached by the book itself. I want to stick as much to it as possible. Could… Read More K&R Exercise 4-10: Segmentation fault while implementing getline