epollwaitint

Epollwaitint is a system call in Unix-like operating systems that is used to wait for events on a set of file descriptors. It is part of the epoll (event poll) interface, which provides a scalable way to monitor multiple file descriptors to see if some of them become ready for some class of I/O operation (e.g., input possible or output possible).

The epollwaitint system call is typically used in conjunction with epollcreate and epollctl. The epollcreate system call creates an epoll instance, which is a file descriptor that can be used to wait for events on other file descriptors. The epollctl system call is used to add, modify, or delete file descriptors from the epoll instance.

The epollwaitint system call takes three arguments: the epoll file descriptor, a pointer to an array of epoll_event structures, and the maximum number of events to return. The epoll_event structure contains information about the event, such as the file descriptor that is ready and the type of event that occurred.

The epollwaitint system call returns the number of events that occurred, or -1 if an error occurred. If no events occurred, the call blocks until an event occurs or the timeout expires. The timeout is specified in milliseconds and is passed as the fourth argument to the system call.

Epollwaitint is commonly used in network servers and other applications that need to monitor multiple file descriptors for I/O events. It provides a more scalable alternative to the traditional select and poll system calls, which can become inefficient when monitoring a large number of file descriptors.