144 lines
5.6 KiB
Cython
144 lines
5.6 KiB
Cython
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# available since Python 2.7!
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cdef extern from "Python.h":
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ctypedef struct PyCapsule_Type
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# This subtype of PyObject represents an opaque value, useful for
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# C extension modules who need to pass an opaque value (as a void*
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# pointer) through Python code to other C code. It is often used
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# to make a C function pointer defined in one module available to
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# other modules, so the regular import mechanism can be used to
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# access C APIs defined in dynamically loaded modules.
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ctypedef void (*PyCapsule_Destructor)(object o) noexcept
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# The type of a destructor callback for a capsule.
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#
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# See PyCapsule_New() for the semantics of PyCapsule_Destructor
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# callbacks.
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bint PyCapsule_CheckExact(object o)
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# Return true if its argument is a PyCapsule.
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object PyCapsule_New(void *pointer, const char *name,
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PyCapsule_Destructor destructor)
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# Return value: New reference.
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#
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# Create a PyCapsule encapsulating the pointer. The pointer
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# argument may not be NULL.
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#
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# On failure, set an exception and return NULL.
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#
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# The name string may either be NULL or a pointer to a valid C
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# string. If non-NULL, this string must outlive the
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# capsule. (Though it is permitted to free it inside the
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# destructor.)
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#
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# If the destructor argument is not NULL, it will be called with
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# the capsule as its argument when it is destroyed.
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#
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# If this capsule will be stored as an attribute of a module, the
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# name should be specified as modulename.attributename. This will
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# enable other modules to import the capsule using
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# PyCapsule_Import().
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void* PyCapsule_GetPointer(object capsule, const char *name) except? NULL
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# Retrieve the pointer stored in the capsule. On failure, set an
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# exception and return NULL.
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#
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# The name parameter must compare exactly to the name stored in
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# the capsule. If the name stored in the capsule is NULL, the name
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# passed in must also be NULL. Python uses the C function strcmp()
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# to compare capsule names.
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PyCapsule_Destructor PyCapsule_GetDestructor(object capsule) except? NULL
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# Return the current destructor stored in the capsule. On failure,
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# set an exception and return NULL.
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#
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# It is legal for a capsule to have a NULL destructor. This makes
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# a NULL return code somewhat ambiguous; use PyCapsule_IsValid()
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# or PyErr_Occurred() to disambiguate.
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const char* PyCapsule_GetName(object capsule) except? NULL
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# Return the current name stored in the capsule. On failure, set
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# an exception and return NULL.
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#
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# It is legal for a capsule to have a NULL name. This makes a NULL
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# return code somewhat ambiguous; use PyCapsule_IsValid() or
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# PyErr_Occurred() to disambiguate.
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void* PyCapsule_GetContext(object capsule) except? NULL
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# Return the current context stored in the capsule. On failure,
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# set an exception and return NULL.
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#
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# It is legal for a capsule to have a NULL context. This makes a
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# NULL return code somewhat ambiguous; use PyCapsule_IsValid() or
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# PyErr_Occurred() to disambiguate.
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bint PyCapsule_IsValid(object capsule, const char *name)
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# Determines whether or not capsule is a valid capsule. A valid
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# capsule is non-NULL, passes PyCapsule_CheckExact(), has a
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# non-NULL pointer stored in it, and its internal name matches the
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# name parameter. (See PyCapsule_GetPointer() for information on
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# how capsule names are compared.)
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#
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# In other words, if PyCapsule_IsValid() returns a true value,
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# calls to any of the accessors (any function starting with
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# PyCapsule_Get()) are guaranteed to succeed.
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#
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# Return a nonzero value if the object is valid and matches the
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# name passed in. Return 0 otherwise. This function will not fail.
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int PyCapsule_SetPointer(object capsule, void *pointer) except -1
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# Set the void pointer inside capsule to pointer. The pointer may
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# not be NULL.
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#
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# Return 0 on success. Return nonzero and set an exception on
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# failure.
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int PyCapsule_SetDestructor(object capsule, PyCapsule_Destructor destructor) except -1
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# Set the destructor inside capsule to destructor.
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#
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# Return 0 on success. Return nonzero and set an exception on
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# failure.
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int PyCapsule_SetName(object capsule, const char *name) except -1
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# Set the name inside capsule to name. If non-NULL, the name must
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# outlive the capsule. If the previous name stored in the capsule
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# was not NULL, no attempt is made to free it.
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#
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# Return 0 on success. Return nonzero and set an exception on
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# failure.
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int PyCapsule_SetContext(object capsule, void *context) except -1
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# Set the context pointer inside capsule to context. Return 0 on
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# success. Return nonzero and set an exception on failure.
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void* PyCapsule_Import(const char *name, int no_block) except? NULL
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# Import a pointer to a C object from a capsule attribute in a
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# module. The name parameter should specify the full name to the
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# attribute, as in module.attribute. The name stored in the
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# capsule must match this string exactly. If no_block is true,
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# import the module without blocking (using
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# PyImport_ImportModuleNoBlock()). If no_block is false, import
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# the module conventionally (using PyImport_ImportModule()).
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#
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# Return the capsule’s internal pointer on success. On failure,
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# set an exception and return NULL. However, if PyCapsule_Import()
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# failed to import the module, and no_block was true, no exception
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# is set.
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