Poll monitoring input and output

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Poll is a mechanism for monitoring whether a file is readable, as with select. The calling function of the application is as follows: Int poll (struct POLLFD *fds,nfds_t nfds, int timeout); The poll mechanism will determine whether the file in the FDS is readable, if it is readable, it returns immediately, the value returned is the number of readable FD, if it is unreadable, then the process will hibernate timeout for such a long time, and then to determine whether there is a file readable, if any, return the number of FD, if not, then return 0 .

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Poll monitoring input and output