Zig: Error when enabling evented I/O on macOS

[kristoff-it]

Enabling evented I/O on macOS causes an error in the networking code of the standard library.

Code sample:

const std = @import("std");
const os = std.os;

pub const io_mode = .evented;

pub fn main() !void {
    const addr = "127.0.0.1";
    const port = 6379;

    var fd = try os.socket(os.AF_INET, os.SOCK_STREAM, 0);
    errdefer os.close(fd);

    var sock_addr = (try std.net.Address.parseIp4(addr, port)).any;
    try os.connect(fd, &sock_addr, @sizeOf(os.sockaddr_in));

    var sock = std.fs.File.openHandle(fd);
}

Current output:

/Users/kristoff/zig/build/lib/zig/std/event/loop.zig:506:39: error: container 'std.os' has no member called 'EPOLLET'
        return self.linuxWaitFd(fd, os.EPOLLET | os.EPOLLONESHOT | os.EPOLLIN);
                                      ^
/Users/kristoff/zig/build/lib/zig/std/event/loop.zig:455:26: error: container 'std.os' has no member called 'EPOLLET'
        assert(flags & os.EPOLLET == os.EPOLLET);
                         ^

[andrewrk]

Yep, only epoll integration is done so far - but kqueue & Windows I/O Completion Ports are planned for this release cycle.