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/createfile.greg.c

@@ -20,27 +20,9 @@
 #include "libc/calls/strace.internal.h"
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/nt/createfile.h"
-#include "libc/nt/enum/creationdisposition.h"
 #include "libc/nt/thunk/msabi.h"
 
-extern typeof(CreateFile) *const __imp_CreateFileW __msabi;
-
-static const char *DescribeDisposition(int x) {
-  switch (x) {
-    case kNtCreateNew:
-      return "kNtCreateNew";
-    case kNtCreateAlways:
-      return "kNtCreateAlways";
-    case kNtOpenExisting:
-      return "kNtOpenExisting";
-    case kNtOpenAlways:
-      return "kNtOpenAlways";
-    case kNtTruncateExisting:
-      return "kNtTruncateExisting";
-    default:
-      return "wut";
-  }
-}
+__msabi extern typeof(CreateFile) *const __imp_CreateFileW;
 
 /**
  * Opens file on the New Technology.
@@ -58,10 +40,11 @@ textwindows int64_t CreateFile(
                               opt_lpSecurityAttributes, dwCreationDisposition,
                               dwFlagsAndAttributes, opt_hTemplateFile);
   if (hHandle == -1) __winerr();
-  STRACE("CreateFile(%#hs, %s, %s, %p, %s, %s, %ld) → %ld% m", lpFileName,
+  STRACE("CreateFile(%#hs, %s, %s, %s, %s, %s, %ld) → %ld% m", lpFileName,
          DescribeNtFileAccessFlags(dwDesiredAccess),
-         DescribeNtFileShareFlags(dwShareMode), opt_lpSecurityAttributes,
-         DescribeDisposition(dwCreationDisposition),
+         DescribeNtFileShareFlags(dwShareMode),
+         DescribeNtSecurityAttributes(opt_lpSecurityAttributes),
+         DescribeNtCreationDisposition(dwCreationDisposition),
          DescribeNtFileFlagsAndAttributes(dwFlagsAndAttributes),
          opt_hTemplateFile, hHandle);
   return hHandle;