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/createprocess.greg.c

@@ -18,10 +18,11 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/internal.h"
 #include "libc/calls/strace.internal.h"
+#include "libc/intrin/describeflags.internal.h"
 #include "libc/nt/process.h"
 #include "libc/nt/thunk/msabi.h"
 
-extern typeof(CreateProcess) *const __imp_CreateProcessW __msabi;
+__msabi extern typeof(CreateProcess) *const __imp_CreateProcessW;
 
 /**
  * Creates process on the New Technology.
@@ -44,10 +45,11 @@ CreateProcess(const char16_t *opt_lpApplicationName, char16_t *lpCommandLine,
                             opt_out_lpProcessInformation);
   if (!ok) __winerr();
   STRACE(
-      "CreateFile(%#hs, %#hs, %p, %p, %hhhd, %u, %p, %#hs, %p, %p) → %hhhd% m",
-      opt_lpApplicationName, lpCommandLine, opt_lpProcessAttributes,
-      opt_lpThreadAttributes, bInheritHandles, dwCreationFlags,
-      opt_lpEnvironment, opt_lpCurrentDirectory, lpStartupInfo,
+      "CreateFile(%#hs, %#hs, %s, %s, %hhhd, %u, %p, %#hs, %p, %p) → %hhhd% m",
+      opt_lpApplicationName, lpCommandLine,
+      DescribeNtSecurityAttributes(opt_lpProcessAttributes),
+      DescribeNtSecurityAttributes(opt_lpThreadAttributes), bInheritHandles,
+      dwCreationFlags, opt_lpEnvironment, opt_lpCurrentDirectory, lpStartupInfo,
       opt_out_lpProcessInformation, ok);
   return ok;
 }