dragonfly: make test lib/std/std.zig pass

lib/std/c.zig

@@ -9690,6 +9690,7 @@ pub const NSIG = switch (native_os) {
     .illumos => 75,
     // https://github.com/SerenityOS/serenity/blob/046c23f567a17758d762a33bdf04bacbfd088f9f/Kernel/API/POSIX/signal_numbers.h#L42
     .openbsd, .serenity => 33,
+    .dragonfly => 64,
     else => {},
 };
 

lib/std/fs/test.zig

@@ -821,7 +821,7 @@ test "file operations on directories" {
             try expectError(error.IsDir, ctx.dir.createFile(io, test_dir_name, .{}));
             try expectError(error.IsDir, ctx.dir.deleteFile(io, test_dir_name));
             switch (native_os) {
-                .dragonfly, .netbsd => {
+                .netbsd => {
                     // no error when reading a directory. See https://github.com/ziglang/zig/issues/5732
                     const buf = try ctx.dir.readFileAlloc(io, test_dir_name, testing.allocator, .unlimited);
                     testing.allocator.free(buf);
@@ -1241,6 +1241,7 @@ test "createDirPath, put some files in it, deleteTreeMinStackSize" {
 
 test "createDirPath in a directory that no longer exists" {
     if (native_os == .windows) return error.SkipZigTest; // Windows returns FileBusy if attempting to remove an open dir
+    if (native_os == .dragonfly) return error.SkipZigTest; // DragonflyBSD does not produce error (hammer2 fs)
 
     const io = testing.io;
 

lib/std/posix/test.zig

@@ -364,9 +364,10 @@ test "getrlimit and setrlimit" {
 }
 
 test "sigrtmin/max" {
-    if (native_os == .wasi or native_os == .windows or native_os.isDarwin() or native_os == .openbsd) {
-        return error.SkipZigTest;
-    }
+    if (native_os.isDarwin() or switch (native_os) {
+        .wasi, .windows, .openbsd, .dragonfly => true,
+        else => false,
+    }) return error.SkipZigTest;
 
     try expect(posix.sigrtmin() >= 32);
     try expect(posix.sigrtmin() >= posix.system.sigrtmin());
@@ -397,7 +398,7 @@ fn reserved_signo(i: usize) bool {
     if (!builtin.link_libc) return false;
     const max = if (native_os == .netbsd) 32 else 31;
     if (i > max) return true;
-    if (native_os == .openbsd) return false; // no RT signals
+    if (native_os == .openbsd or native_os == .dragonfly) return false; // no RT signals
     return i < posix.sigrtmin();
 }