Fix XNU / FreeBSD / OpenBSD / RHEL5 / NT bugs

For the first time ever, all tests in this codebase now pass, when
run automatically on macos, freebsd, openbsd, rhel5, rhel7, alpine
and windows via the network using the runit and runitd build tools

- Fix vfork exec path etc.
- Add XNU opendir() support
- Add OpenBSD opendir() support
- Add Linux history to syscalls.sh
- Use copy_file_range on FreeBSD 13+
- Fix system calls with 7+ arguments
- Fix Windows with greater than 16 FDs
- Fix RUNIT.COM and RUNITD.COM flakiness
- Fix OpenBSD munmap() when files are mapped
- Fix long double so it's actually long on Windows
- Fix OpenBSD truncate() and ftruncate() thunk typo
- Let Windows fcntl() be used on socket files descriptors
- Fix Windows fstat() which had an accidental printf statement
- Fix RHEL5 CLOCK_MONOTONIC by not aliasing to CLOCK_MONOTONIC_RAW

This is wonderful. I never could have dreamed it would be possible
to get it working so well on so many platforms with tiny binaries.

Fixes #31
Fixes #25
Fixes #14

libc/nt/enum/wt.h

@@ -0,0 +1,10 @@
+#ifndef COSMOPOLITAN_LIBC_NT_ENUM_WT_H_
+#define COSMOPOLITAN_LIBC_NT_ENUM_WT_H_
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+#define kNtWtExecuteonlyonce 8
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_NT_ENUM_WT_H_ */

libc/nt/kernel32/RegisterWaitForSingleObject.s

@@ -1,2 +1,12 @@
 .include "o/libc/nt/codegen.inc"
 .imp	kernel32,__imp_RegisterWaitForSingleObject,RegisterWaitForSingleObject,1191
+
+	.text.windows
+RegisterWaitForSingleObject:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	__imp_RegisterWaitForSingleObject(%rip),%rax
+	jmp	__sysv2nt6
+	.endfn	RegisterWaitForSingleObject,globl
+	.previous

libc/nt/master.sh

@@ -4689,7 +4689,7 @@ imp	'RegisterTouchWindow'					RegisterTouchWindow					user32		2275
 imp	'RegisterUserApiHook'					RegisterUserApiHook					user32		2276
 imp	'RegisterWaitChainCOMCallback'				RegisterWaitChainCOMCallback				advapi32	1695
 imp	'RegisterWaitForInputIdle'				RegisterWaitForInputIdle				kernel32	1190
-imp	'RegisterWaitForSingleObject'				RegisterWaitForSingleObject				kernel32	1191
+imp	'RegisterWaitForSingleObject'				RegisterWaitForSingleObject				kernel32	1191	6
 imp	'RegisterWaitForSingleObjectEx'				RegisterWaitForSingleObjectEx				KernelBase	1389
 imp	'RegisterWaitUntilOOBECompleted'			RegisterWaitUntilOOBECompleted				kernel32	1193
 imp	'RegisterWindowMessageA'				RegisterWindowMessageA					user32		2277

libc/nt/struct/context.h

@@ -5,9 +5,9 @@
 struct NtM128A {
   uint64_t Low;
   int64_t High;
-} forcealign(16);
+};
 
-struct NtXmmSaveArea32 {
+struct NtXmmSaveArea32 { /* basically same as struct FpuState */
   uint16_t ControlWord;
   uint16_t StatusWord;
   uint8_t TagWord;
@@ -53,7 +53,7 @@ struct NtContext {
   uint64_t LastBranchFromRip;
   uint64_t LastExceptionToRip;
   uint64_t LastExceptionFromRip;
-} forcealign(16);
+};
 
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_NT_STRUCT_CONTEXT_H_ */

libc/nt/synchronization.h

@@ -50,6 +50,8 @@ COSMOPOLITAN_C_START_
 typedef void (*NtTimerapcroutine)(void *lpArgToCompletionRoutine,
                                   uint32_t dwTimerLowValue,
                                   uint32_t dwTimerHighValue);
+typedef void (*NtWaitOrTimerCallback)(void *lpParameter,
+                                      bool32 TimerOrWaitFired);
 
 void Sleep(uint32_t dwMilliseconds);
 uint32_t SleepEx(uint32_t dwMilliseconds, bool32 bAlertable);
@@ -68,6 +70,10 @@ uint32_t WaitForSingleObjectEx(int64_t hHandle, uint32_t dwMilliseconds,
 uint32_t WaitForMultipleObjectsEx(unsigned int nCount, const int64_t *lpHandles,
                                   bool32 bWaitAll, uint32_t dwMilliseconds,
                                   bool32 bAlertable);
+bool32 RegisterWaitForSingleObject(int64_t *phNewWaitObject, int64_t hObject,
+                                   NtWaitOrTimerCallback Callback,
+                                   void *Context, uint32_t dwMilliseconds,
+                                   uint32_t dwFlags);
 
 int64_t CreateWaitableTimer(struct NtSecurityAttributes *lpTimerAttributes,
                             bool32 bManualReset, const char16_t *lpTimerName);