> From: Hans Werner Strube <[EMAIL PROTECTED]> > The mwm from lesstif eats up 99 % of CPU time, both in the binary package > and in a self-compiled version. I found that the select() calls in events.c > do not wait but immediately fail with errno = EBADF, although fd_width is 256 > and x_fd is 3 or 4 (printed out in mwm.c). I have not yet found the reason, > only a dirty workaround: Replace the select by usleep(10000).
Now I found the reason of the bug. Whereas fd_width is 256, FD_SETSIZE (the number of bits in fd_set variables) is only 64, so that select() tests for unpredictable file descriptors from 64 to 255. For mwm, as x_fd has low values, it will be sufficient to limit fd_width in mwm.c: if(fd_width > FD_SETSIZE) fd_width = FD_SETSIZE; More generally, the value of FD_SETSIZE in /usr/include/sys/types.h should be increased (as the comments say, to >= NOFILE from param.h)!