“FD_” macros

• Useful macros defined in <sys/select.h> to manage the masks:

• void FD_ZERO( fd_set &fdset );
  
  void FD_SET( int fd, fd_set &fdset );
  void FD_CLR( int fd, fd_set &fdset );
  int FD_ISSET( int fd, fd_set &fdset );

• Note that each macro is passed the address of the file descriptor mask

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