tiny.coz.signals

1pub const signals = @import("signals.zig");

1const std = @import("std");2const sys = @import("sys");34const timer = sys.timer;56pub const Signal = sys.signal.RawSignal;7pub const SignalInfo = sys.signal.SignalInfo;8pub const Action = sys.signal.SignalAction;9pub const Handler = sys.signal.FaultHandler;1011pub const Installed = struct {12    signal: Signal,13    previous: Action,14    active: bool = true,1516    pub fn restore(self: *Installed) void {17        if (!self.active) return;18        sys.signal.installAction(self.signal, &self.previous, null) catch {};19        self.active = false;20    }21};2223pub fn installSampleHandler(handler: Handler) Installed {24    return install(timer.sample_signal, handler);25}2627pub fn install(signal: Signal, handler: Handler) Installed {28    const act = siginfoAction(handler);29    var previous: Action = undefined;30    sys.signal.installAction(signal, &act, &previous) catch return .{31        .signal = signal,32        .previous = previous,33        .active = false,34    };35    return .{ .signal = signal, .previous = previous };36}3738pub fn siginfoAction(handler: Handler) Action {39    return sys.signal.siginfoAction(handler);40}4142var test_signal_count: std.atomic.Value(u32) = .init(0);4344fn countSignal(_: Signal, _: *const SignalInfo, _: ?*anyopaque) callconv(.c) void {45    _ = test_signal_count.fetchAdd(1, .monotonic);46}4748test "sample signal action uses siginfo handler" {49    const act = siginfoAction(countSignal);50    var info: SignalInfo = undefined;51    test_signal_count.store(0, .monotonic);5253    sys.signal.dispatchPreviousAction(act, .USR1, &info, null);5455    try std.testing.expectEqual(@as(u32, 1), test_signal_count.load(.monotonic));56}5758test "installed signal action dispatches and restores" {59    test_signal_count.store(0, .monotonic);6061    var installed = install(.USR1, countSignal);62    defer installed.restore();6364    sys.signal.raise(.USR1);6566    try std.testing.expectEqual(@as(u32, 1), test_signal_count.load(.monotonic));67    installed.restore();68    installed.restore();69}