ndelay.c

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