int QLockFilePrivate::checkFcntlWorksAfterFlock()
{
QTemporaryFile file;
if (!file.open())
return -2;
const int fd = file.d_func()->engine()->handle();
if (flock(fd, LOCK_EX | LOCK_NB) == -1) // other threads, and other processes on a local fs
return -3;
struct flock flockData;
flockData.l_type = F_WRLCK;
flockData.l_whence = SEEK_SET;
flockData.l_start = 0;
flockData.l_len = 0; // 0 = entire file
flockData.l_pid = getpid();
if (fcntl(fd, F_SETLK, &flockData) == -1) // for networked filesystems
return 0;
return 1;
}
