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/Include/pymem.h

@@ -1,21 +1,32 @@
 #ifndef Py_PYMEM_H
 #define Py_PYMEM_H
+#include "third_party/python/Include/object.h"
 #include "third_party/python/Include/pyport.h"
 COSMOPOLITAN_C_START_
 /* clang-format off */
 
+/* Debug-mode build with pymalloc implies PYMALLOC_DEBUG.
+ *  PYMALLOC_DEBUG is in error if pymalloc is not in use.
+ */
+#if defined(Py_DEBUG) && defined(WITH_PYMALLOC) && !defined(PYMALLOC_DEBUG)
+#define PYMALLOC_DEBUG
+#endif
+#if defined(PYMALLOC_DEBUG) && !defined(WITH_PYMALLOC)
+#error "PYMALLOC_DEBUG requires WITH_PYMALLOC"
+#endif
+
 #ifndef Py_LIMITED_API
-PyAPI_FUNC(void *) PyMem_RawMalloc(size_t size);
-PyAPI_FUNC(void *) PyMem_RawCalloc(size_t nelem, size_t elsize);
-PyAPI_FUNC(void *) PyMem_RawRealloc(void *ptr, size_t new_size);
-PyAPI_FUNC(void) PyMem_RawFree(void *ptr);
+void * PyMem_RawMalloc(size_t size);
+void * PyMem_RawCalloc(size_t nelem, size_t elsize);
+void * PyMem_RawRealloc(void *ptr, size_t new_size);
+void PyMem_RawFree(void *ptr);
 
 /* Configure the Python memory allocators. Pass NULL to use default
    allocators. */
-PyAPI_FUNC(int) _PyMem_SetupAllocators(const char *opt);
+int _PyMem_SetupAllocators(const char *opt);
 
 #ifdef WITH_PYMALLOC
-PyAPI_FUNC(int) _PyMem_PymallocEnabled(void);
+int _PyMem_PymallocEnabled(void);
 #endif
 
 /* Identifier of an address space (domain) in tracemalloc */
@@ -28,7 +39,7 @@ typedef unsigned int _PyTraceMalloc_domain_t;
    Return -2 if tracemalloc is disabled.
 
    If memory block is already tracked, update the existing trace. */
-PyAPI_FUNC(int) _PyTraceMalloc_Track(
+int _PyTraceMalloc_Track(
     _PyTraceMalloc_domain_t domain,
     uintptr_t ptr,
     size_t size);
@@ -37,7 +48,7 @@ PyAPI_FUNC(int) _PyTraceMalloc_Track(
    Do nothing if the block was not tracked.
 
    Return -2 if tracemalloc is disabled, otherwise return 0. */
-PyAPI_FUNC(int) _PyTraceMalloc_Untrack(
+int _PyTraceMalloc_Untrack(
     _PyTraceMalloc_domain_t domain,
     uintptr_t ptr);
 
@@ -49,11 +60,11 @@ PyAPI_FUNC(int) _PyTraceMalloc_Untrack(
    is not tracked by tracemalloc.
 
    Raise an exception and return NULL on error. */
-PyAPI_FUNC(PyObject*) _PyTraceMalloc_GetTraceback(
+PyObject* _PyTraceMalloc_GetTraceback(
     _PyTraceMalloc_domain_t domain,
     uintptr_t ptr);
 
-PyAPI_FUNC(int) _PyMem_IsFreed(void *ptr, size_t size);
+int _PyMem_IsFreed(void *ptr, size_t size);
 #endif   /* !defined(Py_LIMITED_API) */
 
 
@@ -95,16 +106,16 @@ PyAPI_FUNC(int) _PyMem_IsFreed(void *ptr, size_t size);
    performed on failure (no exception is set, no warning is printed, etc).
 */
 
-PyAPI_FUNC(void *) PyMem_Malloc(size_t size);
+void * PyMem_Malloc(size_t size);
 #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03050000
-PyAPI_FUNC(void *) PyMem_Calloc(size_t nelem, size_t elsize);
+void * PyMem_Calloc(size_t nelem, size_t elsize);
 #endif
-PyAPI_FUNC(void *) PyMem_Realloc(void *ptr, size_t new_size);
-PyAPI_FUNC(void) PyMem_Free(void *ptr);
+void * PyMem_Realloc(void *ptr, size_t new_size);
+void PyMem_Free(void *ptr);
 
 #ifndef Py_LIMITED_API
-PyAPI_FUNC(char *) _PyMem_RawStrdup(const char *str);
-PyAPI_FUNC(char *) _PyMem_Strdup(const char *str);
+char * _PyMem_RawStrdup(const char *str);
+char * _PyMem_Strdup(const char *str);
 #endif
 
 /* Macros. */
@@ -185,7 +196,7 @@ typedef struct {
 } PyMemAllocatorEx;
 
 /* Get the memory block allocator of the specified domain. */
-PyAPI_FUNC(void) PyMem_GetAllocator(PyMemAllocatorDomain domain,
+void PyMem_GetAllocator(PyMemAllocatorDomain domain,
                                     PyMemAllocatorEx *allocator);
 
 /* Set the memory block allocator of the specified domain.
@@ -199,7 +210,7 @@ PyAPI_FUNC(void) PyMem_GetAllocator(PyMemAllocatorDomain domain,
    If the new allocator is not a hook (don't call the previous allocator), the
    PyMem_SetupDebugHooks() function must be called to reinstall the debug hooks
    on top on the new allocator. */
-PyAPI_FUNC(void) PyMem_SetAllocator(PyMemAllocatorDomain domain,
+void PyMem_SetAllocator(PyMemAllocatorDomain domain,
                                     PyMemAllocatorEx *allocator);
 
 /* Setup hooks to detect bugs in the following Python memory allocator
@@ -218,7 +229,7 @@ PyAPI_FUNC(void) PyMem_SetAllocator(PyMemAllocatorDomain domain,
    - detect write after the end of the buffer (buffer overflow)
 
    The function does nothing if Python is not compiled is debug mode. */
-PyAPI_FUNC(void) PyMem_SetupDebugHooks(void);
+void PyMem_SetupDebugHooks(void);
 #endif
 
 COSMOPOLITAN_C_END_