Make more fixes and improvements

- Remove PAGESIZE constant
- Fix realloc() documentation
- Fix ttyname_r() error reporting
- Make forking more reliable on Windows
- Make execvp() a few microseconds faster
- Make system() a few microseconds faster
- Tighten up the socket-related magic numbers
- Loosen restrictions on mmap() offset alignment
- Improve GetProgramExecutableName() with getenv("_")
- Use mkstemp() as basis for mktemp(), tmpfile(), tmpfd()
- Fix flakes in pthread_cancel_test, unix_test, fork_test
- Fix recently introduced futex stack overflow regression
- Let sockets be passed as stdio to subprocesses on Windows
- Improve security of bind() on Windows w/ SO_EXCLUSIVEADDRUSE

libc/nt/ipc.h

@@ -85,6 +85,11 @@ bool32 TransactNamedPipe(int64_t hNamedPipe, void *lpInBuffer,
                          uint32_t nOutBufferSize, uint32_t *lpBytesRead,
                          struct NtOverlapped *lpOverlapped);
 
+bool32 GetNamedPipeInfo(int64_t hNamedPipe, uint32_t *opt_out_lpFlags,
+                        uint32_t *opt_out_lpOutBufferSize,
+                        uint32_t *opt_out_lpInBufferSize,
+                        uint32_t *opt_out_lpMaxInstances);
+
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_NT_IPC_H_ */

libc/nt/kernel32/GetNamedPipeInfo.S

@@ -0,0 +1,18 @@
+#include "libc/nt/codegen.h"
+.imp	kernel32,__imp_GetNamedPipeInfo,GetNamedPipeInfo
+
+	.text.windows
+        .ftrace1
+GetNamedPipeInfo:
+        .ftrace2
+#ifdef __x86_64__
+	push	%rbp
+	mov	%rsp,%rbp
+	mov	__imp_GetNamedPipeInfo(%rip),%rax
+	jmp	__sysv2nt6
+#elif defined(__aarch64__)
+	mov	x0,#0
+	ret
+#endif
+	.endfn	GetNamedPipeInfo,globl
+	.previous

libc/nt/master.sh

@@ -93,6 +93,7 @@ imp	'GetModuleFileName'					GetModuleFileNameW					kernel32	3
 imp	'GetModuleHandle'					GetModuleHandleA					kernel32	1
 imp	'GetModuleHandleEx'					GetModuleHandleExW					kernel32	3
 imp	'GetModuleHandleW'					GetModuleHandleW					kernel32	1
+imp	'GetNamedPipeInfo'					GetNamedPipeInfo					kernel32	5
 imp	'GetNumberOfConsoleInputEvents'				GetNumberOfConsoleInputEvents				kernel32	2
 imp	'GetNumberOfConsoleMouseButtons'			GetNumberOfConsoleMouseButtons				kernel32	1
 imp	'GetOverlappedResult'					GetOverlappedResult					kernel32	4
@@ -246,8 +247,8 @@ imp	'VirtualAlloc'						VirtualAlloc						kernel32	4
 imp	'VirtualAllocEx'					VirtualAllocEx						kernel32	5
 imp	'VirtualFree'						VirtualFree						kernel32	3
 imp	'VirtualLock'						VirtualLock						kernel32	2
-imp	'VirtualUnlock'						VirtualUnlock						kernel32	2
 imp	'VirtualQuery'						VirtualQuery						kernel32	3
+imp	'VirtualUnlock'						VirtualUnlock						kernel32	2
 imp	'WaitForMultipleObjectsEx'				WaitForMultipleObjectsEx				kernel32	5
 imp	'WaitForSingleObjectEx'					WaitForSingleObjectEx					kernel32	3
 imp	'WideCharToMultiByte'					WideCharToMultiByte					kernel32	8