Calling a function with argument

hello people...
i'm having a problem with my program, its a bluetooth program that sends a message to another party using the given MAC address,

Code:

//rfcomm Sender

#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>

int bt_send()
{
    struct sockaddr_rc addr = { 0 };
    int s, status;
    char dest[18] = "00:03:7A:AA:92:DE"; //Another Party  MAC Address

    // allocate a socket
    s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);

    // set the connection parameters (who to connect to)
    addr.rc_family = AF_BLUETOOTH;
    addr.rc_channel = (uint8_t) 1;
    str2ba( dest, &addr.rc_bdaddr );

    // connect to server
    status = connect(s, (struct sockaddr *)&addr, sizeof(addr));

    // send a message
    if( status == 0 ) {
        status = write(s, "STOP" , 6);
    }

    if( status < 0 ) perror("Error ");

    close(s);
    return 0;
}
int main()
{
bt_send();
}

i need to call this function( bt_send() ) with an argument, that sits where "STOP" is now located;
here:

Code:

    // send a message
    if( status == 0 ) {
        status = write(s, "STOP" , 6);
    }

how can i call this function with an argument, something like this:

Code:

bt_send(START);

this would do this:

Code:

    // send a message
    if( status == 0 ) {
        status = write(s, "START" , 6);
    }

or this:

Code:

bt_send(STOP);

that does this:

Code:

    // send a message
    if( status == 0 ) {
        status = write(s, "STOP" , 6);
    }

how can I do this?
thanks in advance.

....C basic

Code:

#define START "START"
#define STOP  "STOP"

int bt_send( const char *SIGNAL )
{
	/* .... whatever */
	
	// send a message
	if( status == 0 ) {
		status = write( s, SIGNAL, 6 );
	}
	
	/* .... the rest */
}

int 
main( void )
{
	bt_send( START );
}

C Basic... true that.... :P i should know these stuff

but thanks bvkim... problem solved