Unknown state [2025-08-04]

loader/watch.zig

@@ -0,0 +1,41 @@
+const std = @import("std");
+const linux = std.os.linux;
+
+pub fn main() !void {
+    std.log.debug("setting up watches.", .{});
+
+    var event: linux.inotify_event = undefined;
+    const event_buf = std.mem.asBytes(&event);
+
+    const fd: i32 = @intCast(linux.inotify_init1(linux.IN.NONBLOCK));
+    defer _ = linux.close(fd);
+
+    const wd: i32 = @intCast(linux.inotify_add_watch(
+        fd,
+        "sample.txt",
+        linux.IN.MODIFY | linux.IN.CLOSE_WRITE,
+    ));
+    defer _ = linux.inotify_rm_watch(fd, wd);
+
+    var fds = [_]linux.pollfd{
+        .{ .fd = fd, .events = linux.POLL.IN, .revents = 0 },
+    };
+
+    while (true) {
+        const k = linux.poll(&fds, fds.len, 1000);
+        std.log.debug("poll -> {d}", .{k});
+
+        if (k > 0) {
+            while (true) {
+                const n: isize = @bitCast(linux.read(
+                    fd,
+                    event_buf.ptr,
+                    event_buf.len,
+                ));
+                std.log.debug("read -> {d}", .{n});
+                std.time.sleep(500 * std.time.ns_per_ms);
+                if (n < 0) break;
+            }
+        }
+    }
+}