select函数简单用法例程

在《The Linux Programming Interface》的 63.2.1 The select() System Call中讲述了 select() 函数的用法

下面是原型:

1 #include <sys/time.h> /* For portability */
2 #include <sys/select.h>
3 int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
4 struct timeval *timeout);
5 
6 Returns number of ready file descriptors, 0 on timeout, or –1 on error

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