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_ */