Make improvements

- Improved async signal safety of read() particularly for longjmp()
- Started adding cancel cleanup handlers for locks / etc on Windows
- Make /dev/tty work better particularly for uses like `foo | less`
- Eagerly read console input into a linked list, so poll can signal
- Fix some libc definitional bugs, which configure scripts detected

libc/log/checkfail.c

@@ -30,6 +30,7 @@
 #include "libc/runtime/memtrack.internal.h"
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
 
 __static_yoink("strerror_wr");
 
@@ -69,11 +70,10 @@ relegated void __check_fail(const char *suffix,   //
     va_end(va);
     kprintf("\n");
   }
-  kprintf("\t%m\n\t%s%s", SUBTLE, program_invocation_name);
+  kprintf("\t%s\n\t%s%s", strerror(errno), SUBTLE, program_invocation_name);
   for (i = 1; i < __argc; ++i) {
     kprintf(" %s", __argv[i]);
   }
   kprintf("%s\n", RESET);
   __die();
-  __builtin_unreachable();
 }

libc/log/die.c

@@ -47,7 +47,7 @@ relegated wontreturn void __die(void) {
   strcpy(host, "unknown");
   gethostname(host, sizeof(host));
   kprintf("%serror: %s on %s pid %d tid %d has perished%s\n"
-          "       cosmoaddr2line %s%s %s\n",
+          "cosmoaddr2line %s%s %s\n",
           __nocolor ? "" : "\e[1;31m", program_invocation_short_name, host,
           getpid(), gettid(), __nocolor ? "" : "\e[0m", __argv[0],
           endswith(__argv[0], ".com") ? ".dbg" : "",