source: umon/main/glib/pollconsole.c @ b987a75

#include "config.h"
#include <ctype.h>
#include "ether.h"
#include "genlib.h"
#include "stddefs.h"
#include "timer.h"

/* pollConsole():
 * Common function used to query the console port with a message.
 * If after about a 2-second period (or the time specified by POLLTIMEOUT),
 * there is no response from the console, then return 0; else return
 * the character that was received.
 */
int
pollConsole(char *msg)
{
        char    *env;
        int             pollval, msec;
        struct elapsed_tmr tmr;

        env = getenv("POLLTIMEOUT");
        if (env)
                msec = strtol(env,0,0);
        else
                msec = 2000;

        pollval = 0;
        printf("%s",msg);
        startElapsedTimer(&tmr,msec);
        while(!msecElapsed(&tmr)) {
                if (gotachar()) {
                        while(gotachar())
                                pollval = getchar();
                        break;
                }
                pollethernet();
        }
        putstr("\r\n");
        
        if (ELAPSED_TIMEOUT(&tmr))
                return(0);

        return(pollval);
}