Refactoring in chapters

process_chp3/ex1.c

@@ -0,0 +1,46 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+struct MyStruct {
+  int value;
+};
+
+int value = 5;
+
+int main(void)
+{
+  struct MyStruct *str;
+  str->value = 5;
+
+  int *p = malloc(sizeof(int));
+  *p = 100;
+
+  printf("PARENT: %p\n", &value);
+  printf("PARENT: %p\n", str);
+  printf("PARENT: %p\n", p);
+
+  pid_t pid;
+  pid = fork();
+
+  if (pid == 0) {
+    value += 15;
+    str->value += 15;
+    *p += 10;
+    printf("CHILD: %p, %d\n", &value, value);
+    printf("CHILD: %p, %d\n", &str->value, str->value);
+    printf("CHILD: %p, %d\n", p, *p);
+    return 0;
+  } else if (pid > 0) {
+    wait(NULL);
+    printf("PARENT: value = %d\n", value);
+    printf("PARENT: value = %d\n", str->value);
+    printf("PARENT: value = %d\n", *p);
+
+    free(p);
+
+    return 0;
+  }
+}