Let's take a basic code written in C, that takes a user input and displays it on the terminal:
#include <stdio.h>#include <unistd.h>int vuln() { char arr[400]; int return_status; printf("What's your name?\n"); return_status = read(0, arr, 400); printf("Hello %s", arr); return 0;}int main(int argc, char *argv[]) { vuln(); return 0;}ssize_t read(int fildes, void *buf, size_t nbytes);
The following table explains the fields used in the preceding code block:
| Field | Description |
|---|---|
| int fildes | The file descriptor of where to read the input. You can either use a file descriptor obtained from the open (http://codewiki.wikidot.com/c:system-calls:open) system call, or you can use 0, 1, or 2, to refer to standard input, standard ... |
