Improve synchronization

- Fix bugs in kDos2Errno definition
- malloc() should now be thread safe
- Fix bug in rollup.com header generator
- Fix open(O_APPEND) on the New Technology
- Fix select() on the New Technology and test it
- Work towards refactoring i/o for thread safety
- Socket reads and writes on NT now poll for signals
- Work towards i/o completion ports on the New Technology
- Make read() and write() intermittently check for signals
- Blinkenlights keyboard i/o so much better on NT w/ poll()
- You can now poll() files and sockets at the same time on NT
- Fix bug in appendr() that manifests with dlmalloc footers off

libc/log/backtrace2.c

@@ -105,7 +105,7 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
     argv[i++] = buf + j;
     buf[j++] = '0';
     buf[j++] = 'x';
-    j += uint64toarray_radix16(addr - 1, buf + j) + 1;
+    j += uint64toarray_radix16(addr, buf + j) + 1;
   }
   argv[i++] = NULL;
   sigemptyset(&chldmask);

libc/log/checkfail.c

@@ -18,6 +18,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/bits/safemacros.internal.h"
 #include "libc/calls/calls.h"
+#include "libc/calls/strace.internal.h"
 #include "libc/errno.h"
 #include "libc/fmt/fmt.h"
 #include "libc/log/check.h"
@@ -26,6 +27,7 @@
 #include "libc/log/libfatal.internal.h"
 #include "libc/log/log.h"
 #include "libc/runtime/memtrack.internal.h"
+#include "libc/runtime/runtime.h"
 
 /**
  * Handles failure of CHECK_xx() macros.
@@ -39,6 +41,8 @@ relegated void __check_fail(const char *suffix, const char *opstr,
   size_t i;
   va_list va;
   char hostname[32];
+  __strace = 0;
+  g_ftrace = 0;
   e = errno;
   p = __fatalbuf;
   __start_fatal(file, line);

libc/log/malloc_stats.c

@@ -17,12 +17,8 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/mem/mem.h"
-#include "libc/stdio/stdio.h"
-#include "third_party/dlmalloc/dlmalloc.internal.h"
+#include "third_party/dlmalloc/dlmalloc.h"
 
 void malloc_stats(void) {
-  struct MallocStats res = dlmalloc_stats(g_dlmalloc);
-  (fprintf)(stderr, "max system bytes = %'10zu\n", res.maxfp);
-  (fprintf)(stderr, "system bytes     = %'10zu\n", res.fp);
-  (fprintf)(stderr, "in use bytes     = %'10zu\n", res.used);
+  dlmalloc_stats();
 }

libc/log/oncrash.c

@@ -40,8 +40,8 @@
  * @see libc/onkill.c
  */
 
-STATIC_YOINK("strerror_r"); /* for kprintf %m */
-STATIC_YOINK("strsignal");  /* for kprintf %G */
+STATIC_YOINK("strerror_wr"); /* for kprintf %m */
+STATIC_YOINK("strsignal");   /* for kprintf %G */
 
 static const char kGregOrder[17] forcealign(1) = {
     13, 11, 8, 14, 12, 9, 10, 15, 16, 0, 1, 2, 3, 4, 5, 6, 7,