numfds           1369 src/system.c       int numfds, maxfds = 0;
numfds           1375 src/system.c       SCM_SYSCALL(numfds,
numfds           1381 src/system.c       if (numfds < 0) Scm_SysError("select failed");
numfds           1382 src/system.c       return Scm_Values4(Scm_MakeInteger(numfds),