Make exciting improvements

- Add Lua backtraces to redbean!
- Wipe serving keys after redbean forks
- Audit redbean to remove free via exit
- Log SSL client ciphersuite preferences
- Increase ASAN malloc() backtrace depth
- Make GetSslRoots() behave as a singleton
- Move leaks.c from LIBC_TESTLIB to LIBC_LOG
- Add undocumented %n to printf() for newlines
- Fix redbean memory leak reindexing inode change
- Fix redbean memory leak with Fetch() DNS object
- Restore original environ after __cxa_finalize()
- Make backtrace always work after __cxa_finalize()
- Introduce COUNTEXPR() diagnostic / benchmark tool
- Fix a few more instances of errno being clobbered
- Consolidate the ANSI color disabling internal APIs

libc/log/restoretty.c

@@ -17,13 +17,19 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/calls/struct/termios.h"
 #include "libc/calls/termios.h"
-#include "libc/dce.h"
+#include "libc/errno.h"
 #include "libc/log/color.internal.h"
 #include "libc/log/internal.h"
-#include "libc/nt/runtime.h"
-#include "libc/str/str.h"
-#include "libc/sysv/consts/nr.h"
+#include "libc/sysv/consts/termios.h"
+
+/**
+ * @fileoverview Terminal Restoration Helper
+ *
+ * This is used by the crash reporting functions, e.g. __die(), to help
+ * ensure the terminal is in an unborked state after a crash happens.
+ */
 
 #define RESET_COLOR   "\e[0m"
 #define SHOW_CURSOR   "\e[?25h"
@@ -32,13 +38,10 @@
 
 struct termios g_oldtermios;
 
-asm(".section .privileged,\"ax\",@progbits\n__syscall:\n\t"
-    "syscall\n\t"
-    "ret\n\t"
-    ".previous");
-
 static textstartup void g_oldtermios_init() {
+  int e = errno;
   tcgetattr(1, &g_oldtermios);
+  errno = e;
 }
 
 const void *const g_oldtermios_ctor[] initarray = {
@@ -46,7 +49,7 @@ const void *const g_oldtermios_ctor[] initarray = {
 };
 
 void __restore_tty(int fd) {
-  if (g_oldtermios.c_lflag && isatty(fd) && cancolor()) {
+  if (g_oldtermios.c_lflag && !__nocolor && isatty(fd)) {
     write(fd, ANSI_RESTORE, strlen(ANSI_RESTORE));
     tcsetattr(fd, TCSAFLUSH, &g_oldtermios);
   }