+freebsd.ha (1418B)
1 // SPDX-License-Identifier: MPL-2.0 2 // (c) Hare authors <https://harelang.org> 3 4 use errors; 5 use io; 6 use rt; 7 use time; 8 9 // Events bitfield for the events and revents field of [[pollfd]]. 10 export type event = enum i16 { 11 POLLIN = 1, 12 POLLPRI = 2, 13 POLLOUT = 4, 14 POLLERR = 8, 15 POLLHUP = 16, 16 }; 17 18 // A single file descriptor to be polled. 19 export type pollfd = struct { 20 fd: io::file, 21 events: i16, 22 revents: i16, 23 }; 24 25 // Pass this [[time::duration]] to [[poll]] to cause it wait indefinitely for 26 // the next event. 27 export def INDEF: time::duration = -1; 28 29 // Pass this [[time::duration]] to [[poll]] to cause it to return immediately if 30 // no events are available. 31 export def NONBLOCK: time::duration = 0; 32 33 // Polls for the desired events on a slice of [[pollfd]]s, blocking until an 34 // event is available, or the timeout expires. Set the timeout to [[INDEF]] to 35 // block forever, or [[NONBLOCK]] to return immediately if no events are 36 // available. Returns the number of [[pollfd]] items which have events, i.e. 37 // those which have revents set to a nonzero value. 38 export fn poll( 39 fds: []pollfd, 40 timeout: time::duration, 41 ) (uint | error) = { 42 let ts = time::duration_to_timespec(timeout); 43 let ts = if (timeout == INDEF) null else &ts; 44 match (rt::ppoll(fds: *[*]pollfd: *[*]rt::pollfd, len(fds): rt::nfds_t, ts, null)) { 45 case let err: rt::errno => 46 return errors::errno(err); 47 case let n: int => 48 return n: uint; 49 }; 50 };