Fixing output file appending indefinitely #2.

Signed-off-by: Barbu Alexandru Daniel <barbualex.daniel2004@gmail.com>

.vscode/settings.json

+{
+    "files.associations": {
+        "consumer.h": "c",
+        "ring_buffer.h": "c",
+        "packet.h": "c"
+    }
+}
\ No newline at end of file

src/firewall.c

@@ -5,6 +5,8 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <pthread.h>
+#include <unistd.h>
+#include <fcntl.h>
 
 #include "ring_buffer.h"
 #include "consumer.h"
@@ -62,6 +64,8 @@ int main(int argc, char **argv)
 	thread_ids = calloc(num_consumers, sizeof(pthread_t));
 	DIE(thread_ids == NULL, "calloc pthread_t");
 
+	int out_fd_preliminar = open(argv[2], O_RDWR|O_CREAT|O_TRUNC, 0666);
+	close(out_fd_preliminar);
 	/* create consumer threads */
 	threads = create_consumers(thread_ids, num_consumers, &ring_buffer, argv[2]);
 
@@ -71,7 +75,7 @@ int main(int argc, char **argv)
 	/* TODO: wait for child threads to finish execution*/
 	for (int i = 0; i < num_consumers; i++)
 	{
-		printf("joining thread: %d\n",i);
+		// printf("joining thread: %d\n",i);
 		pthread_join(thread_ids[i], NULL);
 	}
 

src/ring_buffer.c

@@ -51,7 +51,7 @@ ssize_t ring_buffer_enqueue(so_ring_buffer_t *ring, void *data, size_t size)
 	sem_wait(&ring->rb_empty);
 
 	pthread_mutex_lock(&ring->mutex);
-	printf("inside critical section of enqueue\n");
+	// printf("inside critical section of enqueue\n");
 	memcpy(ring->data + ring->write_pos * PKT_SIZE, data, size);
 	if (!memcmp(ring->data + ring->write_pos, data, size))
 		all_good = 0;
@@ -87,11 +87,11 @@ ssize_t ring_buffer_dequeue(so_ring_buffer_t *ring, void *data, size_t size)
 	sem_wait(&ring->rb_full);
 
 	pthread_mutex_lock(&ring->mutex);
-	printf("inside critical section of dequeue\n");
+	// printf("inside critical section of dequeue\n");
 	if (ring->len == 0)
 	{
 		pthread_mutex_unlock(&ring->mutex);
-		printf("exiting weird case\n");
+		// printf("exiting weird case\n");
 		return -1;
 	}
 
@@ -108,7 +108,7 @@ ssize_t ring_buffer_dequeue(so_ring_buffer_t *ring, void *data, size_t size)
 	sem_post(&ring->rb_empty);
 
 	pthread_mutex_unlock(&ring->mutex);
-	printf("exiting dequeue\n");
+	// printf("exiting dequeue\n");
 	return all_good;
 }
 
@@ -145,6 +145,6 @@ void ring_buffer_stop(so_ring_buffer_t *ring)
 	pthread_mutex_lock(&ring->mutex);
 	ring->producer_is_alive = 0;
 	sem_post(&ring->rb_full);
-	printf("producer stopped\n");
+	// printf("producer stopped\n");
 	pthread_mutex_unlock(&ring->mutex);
 }