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Poll Back
poll()与select()實現的功能相似, 能監聽多個文件描述符.poll()能監聽特定的某個文件描述符其返回事件poll()比select()更具有細緻的分類poll()效率要比select()高
method
/* select */
unsigned int poll(struct pollfd* __fds, nfds_t __nfds, int __timeout)
/* pollfd */
struct pollfd
{
int fd;
short int events; //expected events
short int revents; //return events
}
parameters
- pollfd: 設置監聽的文件描述符和期待的事件
- nfds: 文件描述符的個數
- timeout: 指定測試時間閾值上界
- NULL: forever
- >0: time
- 0: return immediately after check, without waiting
return value
- num: the number of ready descriptors
- 0: timeout but none is ready
- -1: failure
- errno: wrong code
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