From 63fd94a724893152592b5f318e7d98f2be0ede74 Mon Sep 17 00:00:00 2001
From: Paul Selkirk <paul@psgd.org>
Date: Thu, 2 Jun 2016 12:37:33 -0400
Subject: Refactor serial and slip.

---
 rpc_serial.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 rpc_serial.c

(limited to 'rpc_serial.c')

diff --git a/rpc_serial.c b/rpc_serial.c
new file mode 100644
index 0000000..dc5821f
--- /dev/null
+++ b/rpc_serial.c
@@ -0,0 +1,109 @@
+/*
+ * rpc_serial.c
+ * ------------
+ * Remote procedure call transport over serial line with SLIP framing.
+ *
+ * Copyright (c) 2016, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <termios.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "hal.h"
+#include "hal_internal.h"
+#include "slip_internal.h"
+
+static int fd = -1;
+
+hal_error_t hal_serial_init(const char * const device, const speed_t speed)
+{
+    struct termios tty;
+    
+    fd = open(device, O_RDWR | O_NOCTTY | O_SYNC);
+    if (fd == -1) {
+        fprintf(stderr, "open %s: ", device);
+	return perror(""), HAL_ERROR_RPC_TRANSPORT;
+    }
+
+    if (tcgetattr (fd, &tty) != 0)
+	return perror("tcgetattr"), HAL_ERROR_RPC_TRANSPORT;
+
+    cfsetospeed (&tty, speed);
+    cfsetispeed (&tty, speed);
+
+    tty.c_cflag &= ~CSIZE;
+    tty.c_cflag |= (CS8 | CLOCAL | CREAD);
+
+    tty.c_iflag = 0;
+    tty.c_oflag = 0;
+    tty.c_lflag = 0;
+
+    tty.c_cc[VMIN] = 1;
+    tty.c_cc[VTIME] = 0;
+
+    if (tcsetattr (fd, TCSANOW, &tty) != 0)
+	return perror("tcsetattr"), HAL_ERROR_RPC_TRANSPORT;
+
+    return HAL_OK;
+}
+
+hal_error_t hal_serial_close(void)
+{
+    int ret = close(fd);
+    fd = -1;
+    if (ret != 0)
+        return perror("close"), HAL_ERROR_RPC_TRANSPORT;
+    return HAL_OK;
+}
+
+hal_error_t hal_serial_send_char(const uint8_t c)
+{
+    if (write(fd, &c, 1) != 1)
+	return perror("write"), HAL_ERROR_RPC_TRANSPORT;
+    return HAL_OK;
+}
+
+hal_error_t hal_serial_recv_char(uint8_t * const c)
+{
+    if (read(fd, c, 1) != 1)
+	return perror("read"), HAL_ERROR_RPC_TRANSPORT;
+    return HAL_OK;
+}
+
+/* Access routine for the file descriptor, so daemon can poll on it.
+ */
+int hal_serial_get_fd(void)
+{
+    return fd;
+}
-- 
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