Refactoring in chapters

process_chp3/prod.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/shm.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+int main()
+{
+  const int SIZE = 4096;
+  const char *name = "OS";
+  const char *message_0 = "Hello";
+  const char *message_1 = "World!";
+
+  int shm_fd;
+  void *ptr;
+
+  shm_fd = shm_open(name, O_CREAT | O_RDWR, 0666);
+  ftruncate(shm_fd, SIZE);
+  ptr = mmap(0, SIZE, PROT_WRITE, MAP_SHARED, shm_fd, 0);
+  sprintf(ptr, "%s", message_0);
+  ptr += strlen(message_0);
+  sprintf(ptr, "%s", " ");
+  ptr += 1;
+  sprintf(ptr, "%s", message_1);
+  ptr += strlen(message_1);
+
+  return 0;
+}