Improve synchronization

- Fix bugs in kDos2Errno definition
- malloc() should now be thread safe
- Fix bug in rollup.com header generator
- Fix open(O_APPEND) on the New Technology
- Fix select() on the New Technology and test it
- Work towards refactoring i/o for thread safety
- Socket reads and writes on NT now poll for signals
- Work towards i/o completion ports on the New Technology
- Make read() and write() intermittently check for signals
- Blinkenlights keyboard i/o so much better on NT w/ poll()
- You can now poll() files and sockets at the same time on NT
- Fix bug in appendr() that manifests with dlmalloc footers off

libc/intrin/describentpipemodeflags.greg.c

@@ -0,0 +1,39 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/intrin/describeflags.internal.h"
+#include "libc/macros.internal.h"
+#include "libc/nt/enum/filemapflags.h"
+#include "libc/nt/ipc.h"
+
+static const struct DescribeFlags kPipeModeFlags[] = {
+    {kNtPipeNowait, "Nowait"},                            // 0x0000000001
+    {kNtPipeReadmodeMessage, "ReadmodeMessage"},          // 0x0000000002
+    {kNtPipeTypeMessage, "TypeMessage"},                  // 0x0000000004
+    {kNtPipeRejectRemoteClients, "RejectRemoteClients"},  // 0x0000000008
+    //{kNtPipeAcceptRemoteClients, "AcceptRemoteClients"},  // 0x00000000
+    //{kNtPipeReadmodeByte, "ReadmodeByte"},                // 0x00000000
+    //{kNtPipeWait, "Wait"},                                // 0x00000000
+    //{kNtPipeTypeByte, "TypeByte"},                        // 0x00000000
+};
+
+const char *DescribeNtPipeModeFlags(uint32_t x) {
+  static char pipemodeflags[64];
+  return DescribeFlags(pipemodeflags, sizeof(pipemodeflags), kPipeModeFlags,
+                       ARRAYLEN(kPipeModeFlags), "kNtPipe", x);
+}