Graduate

Signed-off-by: Matt Strapp <matt@mattstrapp.net>

1 files changed, 65 insertions, 0 deletions

diff --git a/csci4061/101920_breakout/pipe_template.c b/csci4061/101920_breakout/pipe_template.c
new file mode 100644
index 0000000..2c37941
--- /dev/null
+++ b/csci4061/101920_breakout/pipe_template.c
@@ -0,0 +1,65 @@
+// -----------------------------------------------------------------------------
+// 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
+  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
+    close(ends[0]);
+    // Write the string to the pipe
+    write(ends[1], string_to_send, bytes_to_send_recv);
+    // Done writing
+    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
+    close(ends[1]);
+    // Read the string from the pipe
+    read(ends[0], recv_buffer, bytes_to_send_recv);
+    // Done reading
+    close(ends[0]);
+    // Print result
+    printf("Child Received: %s\n", recv_buffer);
+    free(recv_buffer);
+  }
+
+  return 0;
+}