feat: update structure

cs2106/lectures/l5/3.c

@@ -0,0 +1,24 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#define READ_END 0
+#define WRITE_END 1
+
+int main() {
+  int pipeFd[2], pid, len;
+
+  char buf[100], *str = "Hello There!";
+
+  pipe(pipeFd);
+
+  if ((pid = fork()) > 0) {
+    close(pipeFd[READ_END]);
+    write(pipeFd[WRITE_END], str, strlen(str) +1);
+    close(pipeFd[WRITE_END]);
+  } else {
+    close(pipeFd[WRITE_END]);
+    len = read(pipeFd[READ_END], buf, sizeof(buf));
+    printf("Proc %d read: %s\n", pid, buf);
+    close(pipeFd[READ_END]);
+  }
+}