add: assigment 2

assignment2/part2/bidirectional.c

@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/wait.h>
+
+int main () {
+  int pipe1[2]; // Parent to child
+  int pipe2[2]; // Child to parent
+
+  // Create both pipes
+  if (pipe(pipe1) == -1 || pipe(pipe2) == -1) {
+    fprintf(stderr, "Could not open pipes");
+    return 1;
+  }
+
+  // Fork process
+  pid_t pid = fork();
+
+  if (pid == 0) {
+    // Child process
+
+    // Close unused pipe ends
+    close(pipe1[1]) ; // Close write end of pipe1
+    close(pipe2[0]) ; // Close read end of pipe2
+
+    // Read message, send response
+    char *message = malloc(100);
+    read(pipe1[0], message, 100);
+    printf("%s", message);
+    free(message);
+
+    char response[] = "Response from child to parent\n";
+    write(pipe2[1], response, sizeof(response));
+  } else {
+    // Parent process
+
+    // Close unused pipe ends
+    close(pipe1[0]) ; // Close read end of pipe1
+    close(pipe2[1]) ; // Close write end of pipe2
+
+    // Send message, read response
+    char message[] = "Sending message from parent to child\n";
+    write(pipe1[1], message, sizeof(message));
+
+    char *response = malloc(100);
+    read(pipe2[0], response, 100);
+    printf("%s", response);
+    free(response);
+
+    // Wait for child process to terminate
+    waitpid(pid, NULL, 0);
+  }
+
+  return 0;
+}

assignment2/part2/test

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+echo "Building executable..."
+
+cd "${FLAKE:-$(dirname $0)}"
+if command -v nix; then
+    bidirectional="$(nix build --no-link --print-out-paths .#a2-p2-bidirectional)/bin/bidirectional"
+else
+    gcc bidirectional.c -o bidirectional
+    bidirectional="./bidirectional"
+fi
+
+out="$("$bidirectional")"
+read -r -d '' expected <<EOF
+Sending message from parent to child
+Response from child to parent
+EOF
+if test "$out" = "$expected"; then
+    echo "SUCCESS"
+fi