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|
const std = @import("../../std.zig");
const builtin = @import("builtin");
const os = std.os;
const mem = std.mem;
const testing = std.testing;
const native_os = builtin.os;
const linux = std.os.linux;
/// POSIX `iovec`, or Windows `WSABUF`. The difference between the two are the ordering
/// of fields, alongside the length being represented as either a ULONG or a size_t.
pub const Buffer = if (native_os.tag == .windows)
extern struct {
len: c_ulong,
ptr: usize,
pub fn from(slice: []const u8) Buffer {
return .{ .len = @intCast(c_ulong, slice.len), .ptr = @ptrToInt(slice.ptr) };
}
pub fn into(self: Buffer) []const u8 {
return @intToPtr([*]const u8, self.ptr)[0..self.len];
}
pub fn intoMutable(self: Buffer) []u8 {
return @intToPtr([*]u8, self.ptr)[0..self.len];
}
}
else
extern struct {
ptr: usize,
len: usize,
pub fn from(slice: []const u8) Buffer {
return .{ .ptr = @ptrToInt(slice.ptr), .len = slice.len };
}
pub fn into(self: Buffer) []const u8 {
return @intToPtr([*]const u8, self.ptr)[0..self.len];
}
pub fn intoMutable(self: Buffer) []u8 {
return @intToPtr([*]u8, self.ptr)[0..self.len];
}
};
pub const Reactor = struct {
pub const InitFlags = enum {
close_on_exec,
};
pub const Event = struct {
data: usize,
is_error: bool,
is_hup: bool,
is_readable: bool,
is_writable: bool,
};
pub const Interest = struct {
hup: bool = false,
oneshot: bool = false,
readable: bool = false,
writable: bool = false,
};
fd: os.fd_t,
pub fn init(flags: std.enums.EnumFieldStruct(Reactor.InitFlags, bool, false)) !Reactor {
var raw_flags: u32 = 0;
const set = std.EnumSet(Reactor.InitFlags).init(flags);
if (set.contains(.close_on_exec)) raw_flags |= linux.EPOLL.CLOEXEC;
return Reactor{ .fd = try os.epoll_create1(raw_flags) };
}
pub fn deinit(self: Reactor) void {
os.close(self.fd);
}
pub fn update(self: Reactor, fd: os.fd_t, identifier: usize, interest: Reactor.Interest) !void {
var flags: u32 = 0;
flags |= if (interest.oneshot) linux.EPOLL.ONESHOT else linux.EPOLL.ET;
if (interest.hup) flags |= linux.EPOLL.RDHUP;
if (interest.readable) flags |= linux.EPOLL.IN;
if (interest.writable) flags |= linux.EPOLL.OUT;
const event = &linux.epoll_event{
.events = flags,
.data = .{ .ptr = identifier },
};
os.epoll_ctl(self.fd, linux.EPOLL.CTL_MOD, fd, event) catch |err| switch (err) {
error.FileDescriptorNotRegistered => try os.epoll_ctl(self.fd, linux.EPOLL.CTL_ADD, fd, event),
else => return err,
};
}
pub fn poll(self: Reactor, comptime max_num_events: comptime_int, closure: anytype, timeout_milliseconds: ?u64) !void {
var events: [max_num_events]linux.epoll_event = undefined;
const num_events = os.epoll_wait(self.fd, &events, if (timeout_milliseconds) |ms| @intCast(i32, ms) else -1);
for (events[0..num_events]) |ev| {
const is_error = ev.events & linux.EPOLL.ERR != 0;
const is_hup = ev.events & (linux.EPOLL.HUP | linux.EPOLL.RDHUP) != 0;
const is_readable = ev.events & linux.EPOLL.IN != 0;
const is_writable = ev.events & linux.EPOLL.OUT != 0;
try closure.call(Reactor.Event{
.data = ev.data.ptr,
.is_error = is_error,
.is_hup = is_hup,
.is_readable = is_readable,
.is_writable = is_writable,
});
}
}
};
test "reactor/linux: drive async tcp client/listener pair" {
if (native_os.tag != .linux) return error.SkipZigTest;
const ip = std.x.net.ip;
const tcp = std.x.net.tcp;
const IPv4 = std.x.os.IPv4;
const IPv6 = std.x.os.IPv6;
const reactor = try Reactor.init(.{ .close_on_exec = true });
defer reactor.deinit();
const listener = try tcp.Listener.init(.ip, .{
.close_on_exec = true,
.nonblocking = true,
});
defer listener.deinit();
try reactor.update(listener.socket.fd, 0, .{ .readable = true });
try reactor.poll(1, struct {
fn call(event: Reactor.Event) !void {
try testing.expectEqual(Reactor.Event{
.data = 0,
.is_error = false,
.is_hup = true,
.is_readable = false,
.is_writable = false,
}, event);
}
}, null);
try listener.bind(ip.Address.initIPv4(IPv4.unspecified, 0));
try listener.listen(128);
var binded_address = try listener.getLocalAddress();
switch (binded_address) {
.ipv4 => |*ipv4| ipv4.host = IPv4.localhost,
.ipv6 => |*ipv6| ipv6.host = IPv6.localhost,
}
const client = try tcp.Client.init(.ip, .{
.close_on_exec = true,
.nonblocking = true,
});
defer client.deinit();
try reactor.update(client.socket.fd, 1, .{ .readable = true, .writable = true });
try reactor.poll(1, struct {
fn call(event: Reactor.Event) !void {
try testing.expectEqual(Reactor.Event{
.data = 1,
.is_error = false,
.is_hup = true,
.is_readable = false,
.is_writable = true,
}, event);
}
}, null);
client.connect(binded_address) catch |err| switch (err) {
error.WouldBlock => {},
else => return err,
};
try reactor.poll(1, struct {
fn call(event: Reactor.Event) !void {
try testing.expectEqual(Reactor.Event{
.data = 1,
.is_error = false,
.is_hup = false,
.is_readable = false,
.is_writable = true,
}, event);
}
}, null);
try reactor.poll(1, struct {
fn call(event: Reactor.Event) !void {
try testing.expectEqual(Reactor.Event{
.data = 0,
.is_error = false,
.is_hup = false,
.is_readable = true,
.is_writable = false,
}, event);
}
}, null);
}
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