std: serenity has preadv now

SerenityOS/serenity@2a9154e

Author: linusg

lib/std/Io/Threaded.zig

@@ -356,7 +356,7 @@ pub fn ioBasic(t: *Threaded) Io {
     };
 }
 
-pub const socket_flags_unsupported = native_os.isDarwin() or native_os == .haiku; // 💩💩
+pub const socket_flags_unsupported = native_os.isDarwin() or native_os == .haiku;
 const have_accept4 = !socket_flags_unsupported;
 const have_flock_open_flags = @hasField(posix.O, "EXLOCK");
 const have_networking = native_os != .wasi;
@@ -367,7 +367,7 @@ const have_futex = switch (builtin.cpu.arch) {
     else => true,
 };
 const have_preadv = switch (native_os) {
-    .windows, .haiku, .serenity => false, // 💩💩💩
+    .windows, .haiku => false,
     else => true,
 };
 const have_sig_io = posix.SIG != void and @hasField(posix.SIG, "IO");

lib/std/posix.zig

@@ -1114,9 +1114,8 @@ pub fn ftruncate(fd: fd_t, length: u64) TruncateError!void {
 /// * Windows
 /// On these systems, the read races with concurrent writes to the same file descriptor.
 pub fn preadv(fd: fd_t, iov: []const iovec, offset: u64) PReadError!usize {
-    // NOTE: serenity does not have preadv but it *does* have pwritev.
     const have_pread_but_not_preadv = switch (native_os) {
-        .windows, .macos, .ios, .watchos, .tvos, .visionos, .haiku, .serenity => true,
+        .windows, .macos, .ios, .watchos, .tvos, .visionos, .haiku => true,
         else => false,
     };
     if (have_pread_but_not_preadv) {