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#ident "$Id: microcom.c,v 1.8 2010/02/20 13:03:58 gert Exp $ Copyright (c) Gert Doering"
/* microcom.c
*
* very barebones 'talk to modem' program - similar to 'cu -l $device'
*
* Calls routines in io.c, tio.c
*/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <errno.h>
#include "mgetty.h"
#include "policy.h"
#include "tio.h"
#define STDIN 0
#define STDOUT 1
/* we don't want logging here */
#ifdef USE_VARARGS
int lprintf() { return 0; }
#else
int lprintf(int level, const char *format, ...) { return 0; }
#endif
int lputs( int level, char * string ) { return 0; }
void exit_usage( char * prog )
{
fprintf( stderr, "usage: %s [-s speed] tty-name\n", prog );
exit(1);
}
int main( int argc, char ** argv )
{
int fd, len;
TIO tio, save_tio;
char buf[100], *device = NULL;
int speed = 9600;
int opt;
while( (opt = getopt( argc, argv, "s:l:" )) != EOF )
{
switch (opt)
{
case 's': speed = atoi(optarg); break;
case 'l': device = optarg; break;
default: exit_usage(argv[0]);
}
}
if ( device == NULL ) /* no "-l device" seen */
{
if ( optind != argc-1 ) exit_usage(argv[0]);
device = argv[optind];
}
else
if ( optind != argc ) exit_usage(argv[0]);
/* lock device */
if ( makelock( device ) == FAIL )
{
fprintf( stderr, "can't lock device '%s', exiting\n", device );
exit(1);
}
fd = open( device, O_RDWR | O_NDELAY );
if ( fd < 0 )
{ perror( "open device failed" ); exit(2); }
/* unset O_NDELAY (otherwise waiting for characters */
/* would be "busy waiting", eating up all cpu) */
fcntl( fd, F_SETFL, O_RDWR);
/* put stdin to "raw mode", handle one character at a time */
tio_get( STDIN, &tio );
save_tio = tio;
tio_mode_raw( &tio );
if ( tio_set( STDIN, &tio ) == ERROR )
{
fprintf( stderr, "error setting TIO settings for STDIN: %s\n",
strerror(errno));
close(fd); rmlocks();
exit(3);
}
/* same thing for modem (plus: set baud rate) - TODO: make CLI option */
tio_get( fd, &tio );
tio_mode_sane( &tio, TRUE );
tio_set_speed( &tio, speed );
tio_mode_raw( &tio );
if ( tio_set( fd, &tio ) == ERROR )
{
fprintf( stderr, "error setting TIO settings for '%s': %s\n",
device, strerror(errno));
close(fd); rmlocks(); tio_set( STDIN, &save_tio );
exit(3);
}
printf( "connected to '%s' (%d bps), exit with ctrl-X...\r\n",
device, speed );
/* main loop: check with select(), then read/write bytes across */
do
{
fd_set rfs;
FD_ZERO( &rfs );
FD_SET( STDIN, &rfs );
FD_SET( fd, &rfs );
select( FD_SETSIZE, &rfs, NULL, NULL, NULL );
if ( FD_ISSET( STDIN, &rfs ) )
{
len = read( STDIN, buf, 100 ); if ( len>0 ) write( fd, buf, len );
if ( len > 0 && buf[0] == 2 ) /* ^B -> break */
{
tio_break( fd );
write( STDOUT, "*break*", 7 );
}
}
if ( FD_ISSET( fd, &rfs ) )
{
len = read( fd, buf, 100 );
if ( len>0 ) write( STDOUT, buf, len );
if ( len==0 )
{ printf( "\n*EOF* from device -> " ); break; }
if ( len<0 )
{ perror( "read from device failed" ); break; }
}
}
while ( buf[0] != 24 ); /* ^X fuer Ende */
printf( "goodbye.\r\n" );
tio_set( STDIN, &save_tio );
close( fd );
exit( 0 );
}
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