Make improvements for Actually Portable Emacs

- Get SIGWINCH working again on the New Technology
- Correctly handle O_NOFOLLOW in open() on Windows
- Implement synthetic umask() functionality on Windows
- Do a better job managing file execute access on Windows
- Fill in `st_uid` and `st_gid` with username hash on Windows
- Munge UNICODE control pictures into control codes on Windows
- Do a better job ensuring Windows console settings are restored
- Introduce KPRINTF_LOG environment variable to log kprintf to a file

libc/calls/struct/fd.internal.h

@@ -3,6 +3,10 @@
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 COSMOPOLITAN_C_START_
 
+#define DO_NOTHING 0
+#define DO_RESTART 1
+#define DO_EINTR   2
+
 #define kFdEmpty    0
 #define kFdFile     1
 #define kFdSocket   2
@@ -23,6 +27,8 @@ struct Fd {
   char kind;
   bool zombie;
   bool dontclose;
+  char buflen;
+  char buf[4];
   unsigned flags;
   unsigned mode;
   int64_t handle;
@@ -44,8 +50,10 @@ struct Fds {
   struct StdinRelay stdin;
 };
 
-int64_t __resolve_stdin_handle(int64_t);
 void WinMainStdin(void);
+int64_t __resolve_stdin_handle(int64_t);
+int __munge_terminal_input(char *, uint32_t *);
+void __echo_terminal_input(struct Fd *, char *, size_t);
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */

libc/calls/struct/sigaction.internal.h

@@ -65,7 +65,7 @@ const char *DescribeSigaction(char[256], int, const struct sigaction *);
 
 void _init_onntconsoleevent(void);
 void _init_wincrash(void);
-void _check_sigwinch();
+void _check_sigwinch(void);
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */

libc/calls/struct/winsize.internal.h

@@ -6,7 +6,7 @@
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 COSMOPOLITAN_C_START_
 
-int tcgetwinsize_nt(struct Fd *, struct winsize *);
+int tcgetwinsize_nt(int, struct winsize *);
 const char *DescribeWinsize(char[64], int, struct winsize *);
 #define DescribeWinsize(rc, ws) DescribeWinsize(alloca(64), rc, ws)