From 89ba57eb2b9e024996da29ba5e429adf15b27a6d Mon Sep 17 00:00:00 2001
From: Matthew Strapp <msattr@gmail.com>
Date: Mon, 19 Oct 2020 07:55:41 -0500
Subject: add breakouts

---
 .vscode/tasks.json                       |  2 +-
 csci4061/101220_breakout/exercise.c      | 22 ++++++++--
 csci4061/101920_breakout/pipe_template.c | 72 ++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+), 5 deletions(-)
 create mode 100644 csci4061/101920_breakout/pipe_template.c

diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 9792107..6af30e3 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -6,7 +6,7 @@
         {
             "label": "Build c++",
             "type": "shell",
-            "command": "g++",
+            "command": "gcc",
             "args": [
                 "-g",
                 "-Wall",
diff --git a/csci4061/101220_breakout/exercise.c b/csci4061/101220_breakout/exercise.c
index 5021142..be8bb11 100644
--- a/csci4061/101220_breakout/exercise.c
+++ b/csci4061/101220_breakout/exercise.c
@@ -9,9 +9,10 @@
 #include <string.h>
 
 int numOfEntries(char* path) {
-    /*
-        Count the number of entries in path
-    */
+    int entries = 0;
+    while (readdir(path) != NULL) {
+        entries++;
+    } return entries;
 }
 
 int main(int argc, char** argv){
@@ -27,7 +28,20 @@ int main(int argc, char** argv){
         return -1;
     }
     struct dirent* entry;
-    
+    DIR* current = dir;
+
+while ((entry = readdir(dir)) != NULL) {
+        if (entry->d_type == "DT_DIR"){
+            printf("Directory: %s\n", entry->d_name);
+            printf("    Entries: %d\n", numOfEntries(entry));
+        } else if (entry->d_type == "DT_REG") {
+            printf("Regular File: %s\n", entry->d_name);
+            printf("    Owner: %d\n");
+            printf("    Size: %f\n");
+        } else {
+            printf("%s\n", entry -> d_name);
+        }
+    }   
     /*
         Iterate through the elements in argv[1]
         Refer the ls example in slides if you have any doubts
diff --git a/csci4061/101920_breakout/pipe_template.c b/csci4061/101920_breakout/pipe_template.c
new file mode 100644
index 0000000..bb59d8d
--- /dev/null
+++ b/csci4061/101920_breakout/pipe_template.c
@@ -0,0 +1,72 @@
+// -----------------------------------------------------------------------------
+// Pipes
+//
+// Write a program that creates a child process and pipes the string
+// "hello child" to the child to be printed. The parent should wait for the
+// child to terminate
+//
+// Template: Implement the TODOs
+//
+// Expected output:
+// Parent Sending: hello child
+// Child Received: hello child
+// -----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+int main(void) {
+  // Open pipe
+  // TODO
+  int ends[2];
+  pipe(ends);
+
+  char string_to_send[] = "hello child";
+  int bytes_to_send_recv = strlen(string_to_send) + 1;
+
+  // Create child process
+  pid_t pid = fork();
+  if (pid < 0) {
+    // Error
+    fprintf(stderr, "ERROR: Failed to fork\n");
+  }
+  else if (pid > 0) {
+    // Parent
+    printf("Parent Sending: %s\n", string_to_send);
+
+    // Parent doesn't need read file descriptor
+    // TODO
+    close(ends[0]);
+    // Write the string to the pipe
+    // TODO
+    write(ends[1], string_to_send, bytes_to_send_recv);
+    // Done writing
+    // TODO
+    close(ends[1]);
+    // Wait for child to terminate
+    wait(NULL);
+  }
+  else {
+    // Child
+
+    char *recv_buffer = malloc(bytes_to_send_recv);
+
+    // Child doesn't need write file descriptor
+    // TODO
+    close(ends[1]);
+    // Read the string from the pipe
+    // TODO
+    read(ends[0], recv_buffer, bytes_to_send_recv);
+    // Done reading
+    // TODO
+    close(ends[0]);
+    // Print result
+    printf("Child Received: %s\n", recv_buffer);
+    free(recv_buffer);
+  }
+
+  return 0;
+}
-- 
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