commit

ex1/ex1.c

@@ -9,6 +9,25 @@
 int main(void)
 {
     // Your code here
+    printf("hello world!\n");
+    int x = 101;
+    int fp = fork();
+    if (fp < 0)
+    { // fork failed; exit
+        fprintf(stderr, "fork failed\n");
+        exit(1);
+    }
+    else if (fp == 0)
+    { // child process satisfies this branch
+        printf("x is: %d \n", x);
+        x = 102;
+    }
+    else
+    {
+        printf("hello, parent here (pid: %d) of child %d\n", (int)getpid(), fp);
+    }
+
+
 
     return 0;
 }

ex2/ex2.c

@@ -9,6 +9,25 @@
 int main(void)
 {
     // Your code here 
+    FILE *file;
+    file = fopen("text.txt", "r+");
+    int fp = fork();
+    if (fp < 0)
+    { // fork failed; exit
+        fprintf(stderr, "fork failed\n");
+        exit(1);
+    }
+    else if (fp == 0)
+    { // child process satisfies this branch
+        //fprintf(file, "%s");
+        fprintf(file, "Hello from child: %d\n", (int)getpid());
+    }
+    else
+    {
+        fprintf(file, "Hello from parent: %d\n", (int)getpid());
+    }
+
+     fclose(file);
 
     return 0;
 }

ex2/text.txt

@@ -0,0 +1,2 @@
+Hello from parent: 54
+Hello from child: 55

ex3/ex3.c

@@ -10,6 +10,21 @@
 int main(void)
 {
     // Your code here
+    int fp = fork();
+    if (fp < 0)
+    { // fork failed; exit
+        fprintf(stderr, "fork failed\n");
+        exit(1);
+    }
+    else if (fp == 0)
+    { // child process satisfies this branch
+        printf("hello\n");
+    }
+    else
+    {
+        int wc = waitpid(fp, NULL, 0);
+        printf("goodbye\n");
+    }
 
     return 0;
 }