C select

int select(int nfds, fd_set *readfs, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);

• nfds: Number of File Descriptor
• readfs: is the Bitmask we use for file descriptors
• writefs: is the Bitmask we use for file descriptors
• except: is the Bitmask we use for file descriptors
• timeout: time for timeout