Read error messages from device file and print to stdout.

tools/scat.c

@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2006, Swedish Institute of Computer Science
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ * 2. 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. 
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.  
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.  
+ *
+ * $Id: scat.c,v 1.1 2006/08/02 14:41:30 bg- Exp $
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <err.h>
+
+#define SLIP_END     0300
+#define SLIP_ESC     0333
+#define SLIP_ESC_END 0334
+#define SLIP_ESC_ESC 0335
+
+#define BAUDRATE B57600
+//#define BAUDRATE B38400
+//#define BAUDRATE B19200
+
+void
+stty_telos(int fd)
+{
+  struct termios tty;
+  speed_t speed = BAUDRATE;
+  int i;
+
+  if(tcflush(fd, TCIOFLUSH) == -1) err(1, "tcflush");
+
+  if(tcgetattr(fd, &tty) == -1) err(1, "tcgetattr");
+
+  cfmakeraw(&tty);
+
+  /* Nonblocking read. */
+  tty.c_cc[VTIME] = 0;
+  tty.c_cc[VMIN] = 0;
+  tty.c_cflag &= ~CRTSCTS;
+  tty.c_cflag &= ~HUPCL;
+  tty.c_cflag &= ~CLOCAL;
+
+  cfsetispeed(&tty, speed);
+  cfsetospeed(&tty, speed);
+
+  if(tcsetattr(fd, TCSAFLUSH, &tty) == -1) err(1, "tcsetattr");
+
+#if 1
+  /* Nonblocking read and write. */
+  /* if(fcntl(fd, F_SETFL, O_NONBLOCK) == -1) err(1, "fcntl"); */
+
+  tty.c_cflag |= CLOCAL;
+  if(tcsetattr(fd, TCSAFLUSH, &tty) == -1) err(1, "tcsetattr");
+
+  i = TIOCM_DTR;
+  if(ioctl(fd, TIOCMBIS, &i) == -1) err(1, "ioctl");
+#endif
+
+  usleep(10*1000);		/* Wait for hardware 10ms. */
+
+  /* Flush input and output buffers. */
+  if(tcflush(fd, TCIOFLUSH) == -1) err(1, "tcflush");
+}
+
+int
+main(int argc, char **argv)
+{
+  int slipfd;
+  int ret;
+  FILE *inslip;
+  const char *siodev;
+  int c;
+  
+  if (argc != 2)
+    err(1, "usage: scat device-file");
+  siodev = argv[1];
+
+  slipfd = open(siodev, O_RDWR | O_NONBLOCK);
+  if (slipfd == -1) err(1, "can't open '%s'", siodev);
+  stty_telos(slipfd);
+  inslip = fdopen(slipfd, "r");
+  if(inslip == NULL) err(1, "main: fdopen");
+
+  do {
+    fd_set rset;
+    
+    FD_ZERO(&rset);
+    FD_SET(slipfd, &rset);
+
+    ret = select(slipfd + 1, &rset, NULL, NULL, NULL);
+    if (FD_ISSET(slipfd, &rset)) {
+      while ((c = getc(inslip)) != -1)
+	if (c != SLIP_END)
+	  putchar(c);
+    }
+    clearerr(inslip);
+  } while (1);
+
+  return 0;    
+}