Sam Park

README.md

@@ -1,15 +1,18 @@
 # Sprint Challenge: Operating Systems and Scheduling
-
+ 
 ## Short Answer Questions
 
 Add your answers inline, below, with your pull request.
 
 1. Name at least three things that a general-purpose operating system is responsible for handling.
+    Memory allocation, job scheduling, and input/output control.
 
 2. Describe the job of the Scheduler in the OS in general.
+    Selects and processes from the queue and loads them into memory for execution.
 
-3. Describe the benefits of the MLFQ over a plain Round-Robin scheduler.
 
+3. Describe the benefits of the MLFQ over a plain Round-Robin scheduler.
+    Round robin has no priorty which means every process has equal priorty. Processes that are more important to the user are not treated as such by the scheduler. MLFQ on the other hand learns from past behaviour to predict the processes that should have higher priority. Usually this translates to a better overall user experience.
 ## Programming Exercise: The Lambda School Shell (`lssh`)
 
 Important Safety Tip: Resist the urge to start coding until you:

lssh/lssh.c

@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-
+#include <errno.h>
 #define PROMPT "lambda-shell$ "
 
 #define MAX_TOKENS 100
@@ -100,9 +100,32 @@ int main(void)
 
         #endif
 
-        /* Add your code for implementing the shell's logic here */
 
+        /* Add your code for implementing the shell's logic here */
+            if (strcmp(args[0], "cd") == 0) {
+                if (args_count != 2) {
+                    printf("Incorrect args input\n");
+                    continue;
+                } else {
+                    if (chdir(args[1]) == -1) {
+                        perror("chdir");
+                        continue;
+                    } else if (chdir(args[1]) == 0) {
+                        chdir(args[1]);
+                    }
+                    continue;
+                }
+            }
+
+        int rc = fork();
+
+        if (rc < 0) {
+            printf("Fork failed\n");
+            exit(1);
+        } else if (rc == 0){
+            execvp(args[0], args);
+            printf("This should not be seen!");
     }
-
+}
     return 0;
 }