Ian Cameron Processes

ex1/ex1.c

@@ -8,7 +8,24 @@
 
 int main(void)
 {
-    // Your code here
+    int x = 100;
+
+        printf("Parent PID: %d, x = %d \n", (int)getpid(), x);
+
+        int rc = fork();
+
+        if (rc == 0)
+        {
+            printf("Fork successful. We are the child process.\n Child PID: %d, Parent PID: %d", getpid(), getppid());
+        }
+        else if (rc > 0)
+        {
+            printf("We are the parent process.\n Parent PID: %d of Child PID: %d", getpid(), rc, x);
+        }
+        else
+        {
+            printf(stderr, "Fork failed");
+        }
 
     return 0;
 }

ex2/ex2.c

@@ -8,7 +8,25 @@
 
 int main(void)
 {
-    // Your code here 
-
+    FILE *fptr;
+    fptr = fopen("text.txt", "w");
+
+    int rc = fork();
+
+    if (rc < 0) {    // fork failed; exit
+        fprintf(stderr, "fork failed\n");
+        exit(1);
+    } else if (rc == 0) {    // child process satisfies this branch
+        printf("hello, child here (pid: %d) \n", (int) getpid());
+    } else {
+        printf("hello, parent here (pid: %d) of child %d\n", (int) getpid(), rc);
+    }
+
+    if (fptr == NULL) 
+    {
+    printf("Error opening text file!");
+    exit(1);
+    }
+
     return 0;
 }

ex3/ex3.c

@@ -9,7 +9,22 @@
 
 int main(void)
 {
-    // Your code here
+    int rc = fork();
 
+    if (rc < 0) 
+    {
+        fprintf(stderr, "Fork failed");
+        exit(1);
+    }
+    else if (rc == 0)
+    {
+        printf("Hello from Child %d", (int) getpid());
+    }
+    else
+    {
+        int wc = waitpid(rc, NULL, 0);  //wait or child to terminate, dont care about status, no flags
+        printf("Goodbye from Parent %d of Child %d", (int) getpid(), rc);
+    }
+
     return 0;
 }