initial push of CPU API code

cpu-api/p3.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/wait.h>
+
+int
+main(int argc, char *argv[])
+{
+    printf("hello world (pid:%d)\n", (int) getpid());
+    int rc = fork();
+    if (rc < 0) {
+        // fork failed; exit
+        fprintf(stderr, "fork failed\n");
+        exit(1);
+    } else if (rc == 0) {
+        // child (new process)
+        printf("hello, I am child (pid:%d)\n", (int) getpid());
+        char *myargs[3];
+        myargs[0] = strdup("wc");   // program: "wc" (word count)
+        myargs[1] = strdup("p3.c"); // argument: file to count
+        myargs[2] = NULL;           // marks end of array
+        execvp(myargs[0], myargs);  // runs word count
+        printf("this shouldn't print out");
+    } else {
+        // parent goes down this path (original process)
+        int wc = wait(NULL);
+        printf("hello, I am parent of %d (wc:%d) (pid:%d)\n",
+	       rc, wc, (int) getpid());
+    }
+    return 0;
+}