Zig 0.17.0-dev (Split by item)

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fileReadStreaming

Dispatch.fileReadStreaming

fn fileReadStreaming(ev: *Evented, file: File, data: []const []u8) File.ReadStreamingError!usize

File

lib/std/Io/Dispatch.zig:1719

Code

fn fileReadStreaming(ev: *Evented, file: File, data: []const []u8) File.ReadStreamingError!usize {
    if (file.flags.nonblocking) nonblocking: {
        return fileReadStreamingLimit(file.handle, data, .unlimited) catch |err| switch (err) {
            error.WouldBlock => break :nonblocking,
            else => |e| return e,
        };
    }
    const source = c.dispatch.source_create(
        .READ,
        @bitCast(@as(isize, file.handle)),
        .none,
        ev.queue,
    ) orelse return error.SystemResources;
    source.as_object().set_context(Thread.current().currentFiber());
    source.set_event_handler(&Fiber.@"resume");
    ev.yield(.{ .activate = source.as_object() });
    const limit = source.get_data();
    source.as_object().release();
    while (true) return fileReadStreamingLimit(
        file.handle,
        data,
        .limited(limit),
    ) catch |err| switch (err) {
        error.WouldBlock => {
            ev.yield(.nothing);
            continue;
        },
        else => |e| return e,
    };
}