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moxerver/tty.h

@@ -0,0 +1,66 @@
+/* Handles communication with a tty device. */
+
+#pragma once
+
+#include <common.h>
+#include <termios.h>
+
+#define TTY_DEV_PATH_LEN 128
+
+typedef struct
+{
+	int fd;						 /* tty device file descriptor */
+	struct termios ttysetold;	 /* previous termios settings */
+	struct termios ttyset;		 /* current termios settings */
+	char path[TTY_DEV_PATH_LEN]; /* tty device path */
+	char data[BUFFER_LEN];		 /* buffer for received data */
+} tty_t;
+
+/**
+ * Opens the tty device and configures it.
+ * The old device settings are saved.
+ *
+ * Returns:
+ * - 0 on success
+ * - negative errno value if an error occurred
+ */
+int tty_open(tty_t *tty_dev);
+
+/**
+ * Closes the tty device connection.
+ * Also applies the old device settings.
+ *
+ * Returns:
+ * - 0 on success
+ * - negative errno value if an error occurred
+ */
+int tty_close(tty_t *tty_dev);
+
+/**
+ * Reads incoming data from tty device to tty data buffer.
+ *
+ * Returns:
+ * - number of read bytes on success,
+ * - negative errno value set by an error while reading
+ */
+int tty_read(tty_t *tty_dev);
+
+/**
+ * Sends data from a buffer to tty device.
+ *
+ * Returns:
+ * - number of sent bytes on success,
+ * - negative errno value set by an error while sending
+ */
+int tty_write(tty_t *tty_dev, char *databuf, int datalen);
+
+/**
+ * Converts POSIX speed_t to a baud rate.
+ * The values of the constants for speed_t are not themselves portable.
+ */
+int speed_to_baud(speed_t speed);
+
+/**
+ * Converts a numeric baud rate to a POSIX speed_t.
+ */
+speed_t baud_to_speed(int baud);