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select() -- Check if devices are ready for activity

#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>
#include <unistd.h>
int select(nfds, readfds, writefds, exceptfds, timeout)
int nfds;
fd_set *readfds, *writefds, *exceptfds;
struct timeval *timeout;