Merge branch 'main' into metadata-transfer, resolve conflicts

Conflicts resolved:
- config_create signature: added both use_metadata and use_sendfile params
- config_send/config_receive: wire protocol includes both use_metadata and use_sendfile
- client.c: config_create call updated, arg parsing includes both -M/--preserve and -f/--sendfile
- test_config.c: all three config_create calls updated
- file_send_sendfile: use file->data->size instead of removed struct stat

src/shared/config.c

@@ -7,8 +7,8 @@
 Config *config_create(char *version, char *send_directory,
                       char *receive_directory, bool save_to_disk,
                       bool use_multithreading, bool use_chunk_serialization,
-                      bool use_compression, bool use_metadata,
-                      int compression_level, int num_connections) {
+                       bool use_compression, bool use_metadata,
+                       int compression_level, int num_connections, bool use_sendfile) {
 
   Config *config = malloc(sizeof(Config));
   config->version = version;
@@ -21,6 +21,7 @@ Config *config_create(char *version, char *send_directory,
   config->use_metadata = use_metadata;
   config->compression_level = compression_level;
   config->num_connections = num_connections;
+  config->use_sendfile = use_sendfile;
   return config;
 }
 
@@ -42,6 +43,7 @@ void config_send(int file_descriptor, Config *config) {
   send_int(file_descriptor, config->use_metadata);
   send_int(file_descriptor, config->compression_level);
   send_int(file_descriptor, config->num_connections);
+  send_int(file_descriptor, config->use_sendfile);
   if (receive_status(file_descriptor) != STATUS_OK) {
     perror("Error transmitting config!");
     exit(EXIT_FAILURE);
@@ -60,6 +62,7 @@ Config *config_receive(int file_descriptor) {
   config->use_metadata = receive_int(file_descriptor);
   config->compression_level = receive_int(file_descriptor);
   config->num_connections = receive_int(file_descriptor);
+  config->use_sendfile = receive_int(file_descriptor);
   send_status(file_descriptor, STATUS_OK);
   return config;
 }