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/******************************************************************************
* miniterm.c
*
* Adapted from the example program distributed with the Linux Programmer's
* Guide (LPG). This has been robustified and tweaked to work as a debugging
* terminal for Xen-based machines.
*
* Modifications are released under GPL and copyright (c) 2003, K A Fraser
* The original copyright message and license is fully intact below.
*/
/*
* AUTHOR: Sven Goldt (goldt@math.tu-berlin.de)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <termios.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string.h>
#define DEFAULT_BAUDRATE 115200
#define DEFAULT_SERDEVICE "/dev/ttyS0"
#define ENDMINITERM 0x1d
volatile int stop = 0;
void child_handler(int s)
{
stop = 1;
}
int cook_baud(int baud)
{
int cooked_baud = 0;
switch ( baud )
{
case 50: cooked_baud = B50; break;
case 75: cooked_baud = B75; break;
case 110: cooked_baud = B110; break;
case 134: cooked_baud = B134; break;
case 150: cooked_baud = B150; break;
case 200: cooked_baud = B200; break;
case 300: cooked_baud = B300; break;
case 600: cooked_baud = B600; break;
case 1200: cooked_baud = B1200; break;
case 1800: cooked_baud = B1800; break;
case 2400: cooked_baud = B2400; break;
case 4800: cooked_baud = B4800; break;
case 9600: cooked_baud = B9600; break;
case 19200: cooked_baud = B19200; break;
case 38400: cooked_baud = B38400; break;
case 57600: cooked_baud = B57600; break;
case 115200: cooked_baud = B115200; break;
}
return cooked_baud;
}
int main(int argc, char **argv)
{
int fd, c, cooked_baud = cook_baud(DEFAULT_BAUDRATE);
char *sername = DEFAULT_SERDEVICE;
struct termios oldsertio, newsertio, oldstdtio, newstdtio;
struct sigaction sa;
static char start_str[] =
"************ REMOTE CONSOLE: CTRL-] TO QUIT ********\r\n";
static char end_str[] =
"\n************ REMOTE CONSOLE EXITED *****************\n";
while ( --argc != 0 )
{
char *p = argv[argc];
if ( *p++ != '-' )
goto usage;
if ( *p == 'b' )
{
p++;
if ( (cooked_baud = cook_baud(atoi(p))) == 0 )
{
fprintf(stderr, "Bad baud rate '%d'\n", atoi(p));
goto usage;
}
}
else if ( *p == 'd' )
{
sername = ++p;
if ( *sername == '\0' )
goto usage;
}
else
goto usage;
}
/* Not a controlling tty: CTRL-C shouldn't kill us. */
fd = open(sername, O_RDWR | O_NOCTTY);
if ( fd < 0 )
{
perror(sername);
exit(-1);
}
tcgetattr(fd, &oldsertio); /* save current modem settings */
/*
* 8 data, no parity, 1 stop bit. Ignore modem control lines. Enable
* receive. Set appropriate baud rate. NO HARDWARE FLOW CONTROL!
*/
newsertio.c_cflag = cooked_baud | CS8 | CLOCAL | CREAD;
/* Raw input. Ignore errors and breaks. */
newsertio.c_iflag = IGNBRK | IGNPAR;
/* Raw output. */
newsertio.c_oflag = OPOST;
/* No echo and no signals. */
newsertio.c_lflag = 0;
/* blocking read until 1 char arrives */
newsertio.c_cc[VMIN]=1;
newsertio.c_cc[VTIME]=0;
/* now clean the modem line and activate the settings for modem */
tcflush(fd, TCIFLUSH);
tcsetattr(fd,TCSANOW,&newsertio);
/* next stop echo and buffering for stdin */
tcgetattr(0,&oldstdtio);
tcgetattr(0,&newstdtio); /* get working stdtio */
newstdtio.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
newstdtio.c_oflag &= ~OPOST;
newstdtio.c_cflag &= ~(CSIZE | PARENB);
newstdtio.c_cflag |= CS8;
newstdtio.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
newstdtio.c_cc[VMIN]=1;
newstdtio.c_cc[VTIME]=0;
tcsetattr(0,TCSANOW,&newstdtio);
/* Terminal settings done: now enter the main I/O loops. */
switch ( fork() )
{
case 0:
close(1); /* stdout not needed */
for ( c = (char)getchar(); c != ENDMINITERM; c = (char)getchar() )
write(fd,&c,1);
tcsetattr(fd,TCSANOW,&oldsertio);
tcsetattr(0,TCSANOW,&oldstdtio);
close(fd);
exit(0); /* will send a SIGCHLD to the parent */
break;
case -1:
perror("fork");
tcsetattr(fd,TCSANOW,&oldsertio);
close(fd);
exit(-1);
default:
write(1, start_str, strlen(start_str));
close(0); /* stdin not needed */
sa.sa_handler = child_handler;
sa.sa_flags = 0;
sigaction(SIGCHLD,&sa,NULL); /* handle dying child */
while ( !stop )
{
read(fd,&c,1); /* modem */
c = (char)c;
write(1,&c,1); /* stdout */
}
wait(NULL); /* wait for child to die or it will become a zombie */
write(1, end_str, strlen(end_str));
break;
}
return 0;
usage:
printf("miniterm [-b<baudrate>] [-d<devicename>]\n");
printf("Default baud rate: %d\n", DEFAULT_BAUDRATE);
printf("Default device: %s\n", DEFAULT_SERDEVICE);
return 1;
}
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