Undiamond Python headers

This change gets the Python codebase into a state where it conforms to
the conventions of this codebase. It's now possible to include headers
from Python, without worrying about ordering. Python has traditionally
solved that problem by "diamonding" everything in Python.h, but that's
problematic since it means any change to any Python header invalidates
all the build artifacts. Lastly it makes tooling not work. Since it is
hard to explain to Emacs when I press C-c C-h to add an import line it
shouldn't add the header that actually defines the symbol, and instead
do follow the nonstandard Python convention.

Progress has been made on letting Python load source code from the zip
executable structure via the standard C library APIs. System calss now
recognizes zip!FILENAME alternative URIs as equivalent to zip:FILENAME
since Python uses colon as its delimiter.

Some progress has been made on embedding the notice license terms into
the Python object code. This is easier said than done since Python has
an extremely complicated ownership story.

- Some termios APIs have been added
- Implement rewinddir() dirstream API
- GetCpuCount() API added to Cosmopolitan Libc
- More bugs in Cosmopolitan Libc have been fixed
- zipobj.com now has flags for mangling the path
- Fixed bug a priori with sendfile() on certain BSDs
- Polyfill F_DUPFD and F_DUPFD_CLOEXEC across platforms
- FIOCLEX / FIONCLEX now polyfilled for fast O_CLOEXEC changes
- APE now supports a hybrid solution to no-self-modify for builds
- Many BSD-only magnums added, e.g. O_SEARCH, O_SHLOCK, SF_NODISKIO

third_party/python/Modules/signalmodule.c

@@ -1,22 +1,36 @@
+#include "libc/calls/calls.h"
+#include "libc/calls/struct/itimerval.h"
+#include "libc/dce.h"
+#include "libc/errno.h"
+#include "libc/math.h"
+#include "libc/sysv/consts/itimer.h"
+#include "libc/sysv/consts/sig.h"
+#include "libc/time/time.h"
+#include "third_party/python/Include/ceval.h"
+#include "third_party/python/Include/dictobject.h"
+#include "third_party/python/Include/fileutils.h"
+#include "third_party/python/Include/floatobject.h"
+#include "third_party/python/Include/import.h"
+#include "third_party/python/Include/intrcheck.h"
+#include "third_party/python/Include/longobject.h"
+#include "third_party/python/Include/modsupport.h"
+#include "third_party/python/Include/pgenheaders.h"
+#include "third_party/python/Include/pyatomic.h"
+#include "third_party/python/Include/pyerrors.h"
+#include "third_party/python/Include/pylifecycle.h"
+#include "third_party/python/Include/pymacro.h"
+#include "third_party/python/Include/tupleobject.h"
+#include "third_party/python/Modules/posixmodule.h"
 /* clang-format off */
 
 /* Signal module -- many thanks to Lance Ellinghaus */
 
 /* XXX Signals should be recorded per thread, now we have thread state. */
 
-#include "third_party/python/Include/Python.h"
-#include "third_party/python/Modules/posixmodule.h"
-#include "libc/dce.h"
-#include "libc/calls/calls.h"
-
 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
 #  define PYPTHREAD_SIGMASK
 #endif
 
-#ifndef NSIG
-#define NSIG (IsNetbsd() ? 64 : 32)
-#endif
-
 #include "third_party/python/Modules/clinic/signalmodule.inc"
 
 /*[clinic input]
@@ -59,7 +73,7 @@ static pid_t main_pid;
 static volatile struct {
     _Py_atomic_int tripped;
     PyObject *func;
-} Handlers[NSIG];
+} Handlers[Py_NSIG];
 
 #ifdef MS_WINDOWS
 #define INVALID_FD ((SOCKET_T)-1)
@@ -403,7 +417,7 @@ signal_signal_impl(PyObject *module, int signalnum, PyObject *handler)
         return NULL;
     }
 #endif
-    if (signalnum < 1 || signalnum >= NSIG) {
+    if (signalnum < 1 || signalnum >= Py_NSIG) {
         PyErr_SetString(PyExc_ValueError,
                         "signal number out of range");
         return NULL;
@@ -457,7 +471,7 @@ signal_getsignal_impl(PyObject *module, int signalnum)
 /*[clinic end generated code: output=35b3e0e796fd555e input=ac23a00f19dfa509]*/
 {
     PyObject *old_handler;
-    if (signalnum < 1 || signalnum >= NSIG) {
+    if (signalnum < 1 || signalnum >= Py_NSIG) {
         PyErr_SetString(PyExc_ValueError,
                         "signal number out of range");
         return NULL;
@@ -491,7 +505,7 @@ static PyObject *
 signal_siginterrupt_impl(PyObject *module, int signalnum, int flag)
 /*[clinic end generated code: output=063816243d85dd19 input=4160acacca3e2099]*/
 {
-    if (signalnum < 1 || signalnum >= NSIG) {
+    if (signalnum < 1 || signalnum >= Py_NSIG) {
         PyErr_SetString(PyExc_ValueError,
                         "signal number out of range");
         return NULL;
@@ -737,7 +751,7 @@ iterable_to_sigset(PyObject *iterable, sigset_t *mask)
         Py_DECREF(item);
         if (signum == -1 && PyErr_Occurred())
             goto error;
-        if (0 < signum && signum < NSIG) {
+        if (0 < signum && signum < Py_NSIG) {
             /* bpo-33329: ignore sigaddset() return value as it can fail
              * for some reserved signals, but we want the `range(1, NSIG)`
              * idiom to allow selecting all valid signals.
@@ -769,7 +783,7 @@ sigset_to_set(sigset_t mask)
     if (result == NULL)
         return NULL;
 
-    for (sig = 1; sig < NSIG; sig++) {
+    for (sig = 1; sig < Py_NSIG; sig++) {
         if (sigismember(&mask, sig) != 1)
             continue;
 
@@ -1137,7 +1151,7 @@ default_int_handler() -- default SIGINT handler\n\
 signal constants:\n\
 SIG_DFL -- used to refer to the system default handler\n\
 SIG_IGN -- used to ignore the signal\n\
-NSIG -- number of defined signals\n\
+Py_NSIG -- number of defined signals\n\
 SIGINT, SIGTERM, etc. -- signal numbers\n\
 \n\
 itimer constants:\n\
@@ -1205,7 +1219,7 @@ PyInit__signal(void)
     if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0)
         goto finally;
 
-    x = PyLong_FromLong((long)NSIG);
+    x = PyLong_FromLong((long)Py_NSIG);
     if (!x || PyDict_SetItemString(d, "NSIG", x) < 0)
         goto finally;
     Py_DECREF(x);
@@ -1229,7 +1243,7 @@ PyInit__signal(void)
     Py_INCREF(IntHandler);
 
     _Py_atomic_store_relaxed(&Handlers[0].tripped, 0);
-    for (i = 1; i < NSIG; i++) {
+    for (i = 1; i < Py_NSIG; i++) {
         void (*t)(int);
         t = PyOS_getsig(i);
         _Py_atomic_store_relaxed(&Handlers[i].tripped, 0);
@@ -1451,7 +1465,7 @@ finisignal(void)
     int i;
     PyObject *func;
 
-    for (i = 1; i < NSIG; i++) {
+    for (i = 1; i < Py_NSIG; i++) {
         func = Handlers[i].func;
         _Py_atomic_store_relaxed(&Handlers[i].tripped, 0);
         Handlers[i].func = NULL;
@@ -1501,7 +1515,7 @@ PyErr_CheckSignals(void)
     if (!(f = (PyObject *)PyEval_GetFrame()))
         f = Py_None;
 
-    for (i = 1; i < NSIG; i++) {
+    for (i = 1; i < Py_NSIG; i++) {
         if (_Py_atomic_load_relaxed(&Handlers[i].tripped)) {
             PyObject *result = NULL;
             PyObject *arglist = Py_BuildValue("(iO)", i, f);
@@ -1570,7 +1584,7 @@ _clear_pending_signals(void)
     if (!_Py_atomic_load(&is_tripped))
         return;
     _Py_atomic_store(&is_tripped, 0);
-    for (i = 1; i < NSIG; ++i) {
+    for (i = 1; i < Py_NSIG; ++i) {
         _Py_atomic_store_relaxed(&Handlers[i].tripped, 0);
     }
 }