case of error with the "errno" variable set to the specific error code.
epoll_pwait
fn
int epoll_pwait(int epfd, epoll_event * events, int maxevents, int timeout,
const sigset_t * ss)Wait for events on an epoll instance
Parameters
epfd | an epoll file descriptor instance |
events | a buffer that will contain triggered events |
maxevents | the maximum number of events to be returned ( usually size of "events" ) |
timeout | specifies the maximum wait time in milliseconds (-1 == infinite) |
ss | a signal set. May be specified as null, in which case epoll_pwait() is equivalent to epoll_wait(). |
Returns
the number of triggered events returned in "events" buffer. Or -1 in