Re: [gpsd-users] gpsd only started one time (tty already opened)

[Forum]

I could find the check in the source.

#ifdef __linux__
        /*
         * Don't touch devices already opened by another process.
         */
        if (fusercount(session->gpsdata.dev.path) > 1) {
            gpsd_log(&session->context->errout, LOG_ERROR,
                     "%s already opened by another process\n",
                     session->gpsdata.dev.path);
            (void)close(session->gpsdata.gps_fd);
            session->gpsdata.gps_fd = UNALLOCATED_FD;
            return UNALLOCATED_FD;
        }
#endif /* __linux__ */

and

static int fusercount(const char *path)
/* return true if any process has the specified path open */
{

Now i searched and indeed i found a process which has the path 'ttyAMA0' open.
Problem found and solved.

Thanks for the work of gpsd.