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#include <sys/types.h>
#include <fcntl.h>
#include "ndelay.h"
#ifndef O_NDELAY
#define O_NDELAY O_NONBLOCK
#endif
int ndelay_on(int fd) {
return fcntl(fd,F_SETFL,fcntl(fd,F_GETFL,0) | O_NDELAY);
}