F_SETLKW
cmd = F_SETLKW;
case F_SETLKW:
fcntl(fcntl_fd, F_SETLKW, &fcntl_fl);
retval[0] = fcntl(fcntl_fd, F_SETLKW, &fcntl_fl);
res = fcntl(fd, F_SETLKW, &fl);
if (fcntl(fd, F_SETLKW, &fl) < 0) {
res = fcntl(slave, F_SETLKW, &fl);
res = fcntl(slave, F_SETLKW, &fl);
res = fcntl(slave, F_SETLKW, &fl);
res = fcntl(fd, F_SETLKW, &fl);
if (fcntl(fd, F_SETLKW, &fl) < 0)
res = fcntl(fd, F_SETLKW, &fl);
if (fcntl(fd, F_SETLKW, &fl) < 0)
res = fcntl(fd, F_SETLKW, &fl);
res = fcntl(fd, F_SETLKW, &fl);
case F_SETLKW: