please help the pathetic ones ...

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---1463806776-820305495-917159698=:13576
Content-Type: TEXT/PLAIN; charset=US-ASCII


 hello,

   please help our pathetic efforts. We've killed a couple of hour on this
last night, and it will be a breeze for you, tty io gurus. Thanks in
advance.

 We are trying to make a "serial port sniffer/dumper/proxy/logger" which
would only pass traffic from one ser.port to the other and vice versa. And
it would write it into a log (possibly with timestamps).

 We made a pathetic attempt, but failed somewhat miserably : it seems that
we can send things to the modem, but are getting garbage back from the
modem. Or nothing.

 I've both attached and appended the same simple file "buffer.c" which is
all we are trying to do. Any help would be greatly appreciated !

    TIA,

     Jan "the pathetic ser.port logger programmer" Vicherek


 -- Gospel of Jesus is the saving power of God for all who believe --
                ## To some, nothing is impossible. ##
                   http://Vicherek.Waterloo.on.ca/


#include <stdio.h>
#include <unistd.h>
//#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
//#include <sys/ioctl.h>


#define FOPS

#define STDIN 0
#define STDOUT 1
#define STDERR 2

#define Ssend "/dev/ttyS1"
#define Srec "/dev/ttyS0"

#define Lsend "buffer.send"
#define Lrec  "buffer.rec"
#define Lall  "buffer.all"

int main (int argc, char *argv[]) {

pid_t pid;


char chBuf;
FILE *fsend, *frec, *lsend, *lrec, *lall;
lall = fopen(Lall, "w+");

//Create read tty process and write tty process
pid = fork();

//pid = 1;

//Intercept from term, SEND to modem
        if (pid) {

                fsend = fopen(Ssend, "r");
                frec = fopen(Srec, "w");
                lsend = fopen(Lsend, "w+");

                while (1) {

                        chBuf = getc(fsend);
                        putc(chBuf, frec);
                        putc(chBuf, lsend);
                        putc(chBuf, lall);
                        fflush(lsend);
                        fflush(lall);
                        }
        } else {

 //RECEIVE from modem, pass to term

                frec = fopen(Srec, "r");
                fsend = fdopen(Ssend, "w");
                lrec = fopen(Lrec, "w+");

                while (1) {
                        chBuf = getc(frec);
                        putc(chBuf, fsend);
                        putc(chBuf, lrec);
                        putc(chBuf, lall);
                        fflush(lrec);
                        fflush(lall);

                }
        }

exit(0);
}


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