Buffered writings: WIP.

src/communication.c

@@ -15,6 +15,8 @@
 // print structures
 #include "message.h"
 
+struct ipc_error ipc_write_fd (int fd, const struct ipc_message *m);
+
 struct ipc_error
 service_path (char *path, const char *sname)
 {
@@ -106,8 +108,6 @@ struct ipc_error ipc_server_init (struct ipc_ctx **ctx, const char *sname)
 	IPC_RETURN_NO_ERROR;
 }
 
-struct ipc_error ipc_write_fd (int fd, const struct ipc_message *m);
-
 // when networkd is not working properly (or do not retrieve the service): srv->fd = 0
 struct ipc_error ipc_contact_networkd (int *pfd, const char *sname)
 {
@@ -263,8 +263,6 @@ struct ipc_error ipc_read (const struct ipc_ctx *ctx, uint32_t index, struct ipc
 
 struct ipc_error ipc_write_fd (int fd, const struct ipc_message *m)
 {
-	T_R ((m == NULL), IPC_ERROR_WRITE__NO_MESSAGE_PARAM);
-
 	char *buf = NULL;
 	size_t msize = 0;
 	ipc_message_format_write (m, &buf, &msize);
@@ -281,10 +279,10 @@ struct ipc_error ipc_write_fd (int fd, const struct ipc_message *m)
 	IPC_RETURN_NO_ERROR;
 }
 
-// TODO: high level API, should be buffered, socket may not be usable for now.
+// Put the message in the list of messages to send.
-struct ipc_error ipc_write (const struct ipc_ctx *ctx, uint32_t index, const struct ipc_message *m)
+struct ipc_error ipc_write (struct ipc_ctx *ctx, const struct ipc_message *m)
 {
-	return ipc_write_fd (ctx->pollfd[index].fd, m);
+	return ipc_messages_add (&ctx->tx, m);
 }
 
 /**
@@ -388,11 +386,33 @@ struct ipc_error ipc_del_fd (struct ipc_ctx *ctx, int fd)
 
 // TODO
 struct ipc_error handle_writing_message (struct ipc_event *event, struct ipc_ctx *ctx, uint32_t index);
+
 struct ipc_error handle_writing_message (struct ipc_event *event, struct ipc_ctx *ctx, uint32_t index)
 {
+	// struct ipc_message {
+	// 	char type;
+	// 	char user_type;
+	// 	uint32_t length;
+	// 	char *payload;
+	// 	int fd; // File descriptor concerned about this message.
+	// };
 
-	for (size_t i = 0; ctx->tx.size ; i++) {
 	// TODO
+	int txfd = ctx->pollfd[index].fd;
+	int mfd;
+	struct ipc_message *m;
+	for (size_t i = 0; ctx->tx.size ; i++) {
+		m = &ctx->tx.messages[i];
+		mfd = m->fd;
+		printf ("Something to send on fd %d\n", mfd);
+		if (txfd == mfd) {
+			printf ("The fd %d is available!\n", txfd);
+
+			printf ("TODO: write!\n");
+
+			printf ("Removing the message\n");
+			ipc_messages_del (&ctx->tx, i); // remove the message indexed by i
+		}
 	}
 
 	IPC_EVENT_SET (event, IPC_EVENT_TYPE_TX, index, ctx->pollfd[index].fd, NULL);

src/ipc.h

@@ -185,6 +185,9 @@ enum ipc_error_code {
 	, IPC_ERROR_CTX_INIT__MALLOC_POLLFD                   = 97
 	, IPC_ERROR_CONTACT_NETWORKD__NO_FD_PARAM             = 98
 	, IPC_ERROR_HANDLE_NEW_CONNECTION__INCONSISTENT_INDEX = 99
+	, IPC_ERROR_DEL_MESSAGE_TO_SEND__NO_PARAM_MESSAGES    = 100
+	, IPC_ERROR_MESSAGE_DEL__INDEX_ERROR                  = 101
+	, IPC_ERROR_MESSAGE_DEL__EMPTY_LIST                   = 102
 };
 
 struct ipc_error {
@@ -226,6 +229,9 @@ struct ipc_messages {
 	size_t size;
 };
 
+struct ipc_error ipc_messages_del  (struct ipc_messages *messages, uint32_t index);
+struct ipc_error ipc_message_free  (struct ipc_message *message);
+
 /**
  * Context of the whole networking state.
  */
@@ -296,7 +302,7 @@ struct ipc_error ipc_close     (struct ipc_ctx *ctx, uint32_t index);
 struct ipc_error ipc_close_all (struct ipc_ctx *ctx);
 
 struct ipc_error ipc_read  (const struct ipc_ctx *, uint32_t index, struct ipc_message *m);
-struct ipc_error ipc_write (const struct ipc_ctx *, uint32_t index, const struct ipc_message *m);
+struct ipc_error ipc_write (struct ipc_ctx *, const struct ipc_message *m);
 
 struct ipc_error ipc_wait_event (struct ipc_ctx *, struct ipc_event *, int *timer);
 
@@ -326,7 +332,7 @@ struct ipc_error ipc_message_format_data (struct ipc_message *m, char utype, con
 struct ipc_error ipc_message_format_server_close (struct ipc_message *m);
 struct ipc_error ipc_message_empty (struct ipc_message *m);
 
-struct ipc_error ipc_messages_add (struct ipc_messages *, struct ipc_message *);
+struct ipc_error ipc_messages_add (struct ipc_messages *, const struct ipc_message *);
 void ipc_messages_free (struct ipc_messages *);
 
 // Switch cases macros

src/message.c

@@ -147,7 +147,7 @@ struct ipc_error ipc_message_empty (struct ipc_message *m)
 }
 
 // store and remove only pointers on allocated structures
-struct ipc_error ipc_messages_add  (struct ipc_messages *messages, struct ipc_message *message)
+struct ipc_error ipc_messages_add  (struct ipc_messages *messages, const struct ipc_message *message)
 {
 	T_R ((messages == NULL), IPC_ERROR_ADD_MESSAGE_TO_SEND__NO_PARAM_MESSAGES);
 	T_R ((message  == NULL), IPC_ERROR_ADD_MESSAGE_TO_SEND__NO_PARAM_MESSAGE);
@@ -168,6 +168,31 @@ struct ipc_error ipc_messages_add  (struct ipc_messages *messages, struct ipc_me
 	IPC_RETURN_NO_ERROR;
 }
 
+struct ipc_error ipc_message_free  (struct ipc_message *message)
+{
+	if (message->payload != NULL) {
+		free (message->payload);
+		message->payload = NULL;
+	}
+	IPC_RETURN_NO_ERROR;
+}
+
+// Remove only pointers on allocated structures.
+struct ipc_error ipc_messages_del  (struct ipc_messages *messages, uint32_t index)
+{
+	T_R ((messages == NULL), IPC_ERROR_DEL_MESSAGE_TO_SEND__NO_PARAM_MESSAGES);
+	T_R ((messages->size == 0 || index >= messages->size), IPC_ERROR_MESSAGE_DEL__INDEX_ERROR);
+
+	// NOT A DEEP COPY.
+	messages->messages[index] = messages->messages[messages->size - 1];
+	messages->size--;
+	messages->messages = realloc (messages->messages, sizeof (struct ipc_message) * messages->size);
+
+	T_R ((messages->messages == NULL), IPC_ERROR_MESSAGE_DEL__EMPTY_LIST);
+
+	IPC_RETURN_NO_ERROR;
+}
+
 void ipc_messages_free (struct ipc_messages *messages)
 {
 	if (messages != NULL)