1 files changed, 206 insertions, 0 deletions
diff --git a/v_windows/v/vlib/os/notify/backend_linux.c.v b/v_windows/v/vlib/os/notify/backend_linux.c.v
new file mode 100644
index 0000000..1913913
--- /dev/null
+++ b/v_windows/v/vlib/os/notify/backend_linux.c.v
@@ -0,0 +1,206 @@
+module notify
+
+import time
+import os
+
+#include <sys/epoll.h>
+
+struct C.epoll_event {
+	events u32
+	data   C.epoll_data_t
+}
+
+[typedef]
+union C.epoll_data_t {
+	ptr voidptr
+	fd  int
+	u32 u32
+	u64 u64
+}
+
+fn C.epoll_create1(int) int
+
+fn C.epoll_ctl(int, int, int, &C.epoll_event) int
+
+fn C.epoll_wait(int, &C.epoll_event, int, int) int
+
+// EpollNotifier provides methods that implement FdNotifier using the
+// epoll I/O event notification facility (linux only)
+[noinit]
+struct EpollNotifier {
+	epoll_fd int
+}
+
+// EpollEvent describes an event that occurred for a file descriptor in
+// the watch list
+[noinit]
+struct EpollEvent {
+pub:
+	fd   int
+	kind FdEventType
+}
+
+// new creates a new EpollNotifier
+// The FdNotifier interface is returned to allow OS specific
+// implementations without exposing the concrete type
+pub fn new() ?FdNotifier {
+	fd := C.epoll_create1(0) // 0 indicates default behavior
+	if fd == -1 {
+		return error(os.posix_get_error_msg(C.errno))
+	}
+	// Needed to circumvent V limitations
+	x := &EpollNotifier{
+		epoll_fd: fd
+	}
+	return x
+}
+
+const (
+	epoll_read         = u32(C.EPOLLIN)
+	epoll_write        = u32(C.EPOLLOUT)
+	epoll_peer_hangup  = u32(C.EPOLLRDHUP)
+	epoll_exception    = u32(C.EPOLLPRI)
+	epoll_error        = u32(C.EPOLLERR)
+	epoll_hangup       = u32(C.EPOLLHUP)
+	epoll_edge_trigger = u32(C.EPOLLET)
+	epoll_one_shot     = u32(C.EPOLLONESHOT)
+	epoll_wake_up      = u32(C.EPOLLWAKEUP)
+	epoll_exclusive    = u32(C.EPOLLEXCLUSIVE)
+)
+
+// ctl is a helper method for add, modify, and remove
+fn (mut en EpollNotifier) ctl(fd int, op int, mask u32) ? {
+	event := C.epoll_event{
+		events: mask
+		data: C.epoll_data_t{
+			fd: fd
+		}
+	}
+	if C.epoll_ctl(en.epoll_fd, op, fd, &event) == -1 {
+		return error(os.posix_get_error_msg(C.errno))
+	}
+}
+
+// add adds a file descriptor to the watch list
+fn (mut en EpollNotifier) add(fd int, events FdEventType, conf ...FdConfigFlags) ? {
+	mask := flags_to_mask(events, ...conf)
+	en.ctl(fd, C.EPOLL_CTL_ADD, mask) ?
+}
+
+// modify sets an existing entry in the watch list to the provided events and configuration
+fn (mut en EpollNotifier) modify(fd int, events FdEventType, conf ...FdConfigFlags) ? {
+	mask := flags_to_mask(events, ...conf)
+	en.ctl(fd, C.EPOLL_CTL_MOD, mask) ?
+}
+
+// remove removes a file descriptor from the watch list
+fn (mut en EpollNotifier) remove(fd int) ? {
+	en.ctl(fd, C.EPOLL_CTL_DEL, 0) ?
+}
+
+// wait waits to be notified of events on the watch list,
+// returns at most 512 events
+fn (mut en EpollNotifier) wait(timeout time.Duration) []FdEvent {
+	// arbitrary 512 limit; events will round robin on successive
+	// waits if the number exceeds this
+	// NOTE: we use a fixed size array here for stack allocation; this has
+	//       the added bonus of making EpollNotifier thread safe
+	events := [512]C.epoll_event{}
+	// populate events with the new events
+	to := timeout.sys_milliseconds()
+	count := C.epoll_wait(en.epoll_fd, &events[0], events.len, to)
+
+	if count > 0 {
+		mut arr := []FdEvent{cap: count}
+		for i := 0; i < count; i++ {
+			fd := unsafe { events[i].data.fd }
+			kind := event_mask_to_flag(events[i].events)
+			if kind.is_empty() {
+				// NOTE: tcc only reports the first event for some
+				// reason, leaving subsequent structs in the array as 0
+				// (or possibly garbage)
+				panic('encountered an empty event kind; this is most likely due to using tcc')
+			}
+			arr << &EpollEvent{
+				fd: fd
+				kind: kind
+			}
+		}
+		return arr
+	}
+	return []
+}
+
+// close closes the EpollNotifier,
+// any successive calls to add, modify, remove, and wait should fail
+fn (mut en EpollNotifier) close() ? {
+	if C.close(en.epoll_fd) == -1 {
+		return error(os.posix_get_error_msg(C.errno))
+	}
+}
+
+// event_mask_to_flag is a helper function that converts a bitmask
+// returned by epoll_wait to FdEventType
+fn event_mask_to_flag(mask u32) FdEventType {
+	mut flags := FdEventType{}
+
+	if mask & notify.epoll_read != 0 {
+		flags.set(.read)
+	}
+	if mask & notify.epoll_write != 0 {
+		flags.set(.write)
+	}
+	if mask & notify.epoll_peer_hangup != 0 {
+		flags.set(.peer_hangup)
+	}
+	if mask & notify.epoll_exception != 0 {
+		flags.set(.exception)
+	}
+	if mask & notify.epoll_error != 0 {
+		flags.set(.error)
+	}
+	if mask & notify.epoll_hangup != 0 {
+		flags.set(.hangup)
+	}
+
+	return flags
+}
+
+// flags_to_mask is a helper function that converts FdEventType and
+// FdConfigFlags to a bitmask used by the C functions
+fn flags_to_mask(events FdEventType, confs ...FdConfigFlags) u32 {
+	mut mask := u32(0)
+	if events.has(.read) {
+		mask |= notify.epoll_read
+	}
+	if events.has(.write) {
+		mask |= notify.epoll_write
+	}
+	if events.has(.peer_hangup) {
+		mask |= notify.epoll_peer_hangup
+	}
+	if events.has(.exception) {
+		mask |= notify.epoll_exception
+	}
+	if events.has(.error) {
+		mask |= notify.epoll_error
+	}
+	if events.has(.hangup) {
+		mask |= notify.epoll_hangup
+	}
+	for conf in confs {
+		if conf.has(.edge_trigger) {
+			mask |= notify.epoll_edge_trigger
+		}
+		if conf.has(.one_shot) {
+			mask |= notify.epoll_one_shot
+		}
+		if conf.has(.wake_up) {
+			mask |= notify.epoll_wake_up
+		}
+		if conf.has(.exclusive) {
+			mask |= notify.epoll_exclusive
+		}
+	}
+	return mask
+}