Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r359:d79455da114a
Date: 2012-06-14 23:29 +0200
http://bitbucket.org/cffi/cffi/changeset/d79455da114a/
Log: Add errno on the ffi objects, and document it.
diff --git a/cffi/api.py b/cffi/api.py
--- a/cffi/api.py
+++ b/cffi/api.py
@@ -196,6 +196,13 @@
from .verifier import Verifier
return Verifier(self).verify(source, **kwargs)
+ def _get_errno(self):
+ return self._backend.get_errno()
+ def _set_errno(self, errno):
+ self._backend.set_errno(errno)
+ errno = property(_get_errno, _set_errno, None,
+ "the value of 'errno' from/to the C calls")
+
def _make_ffi_library(ffi, libname):
name = libname
if name is None:
diff --git a/doc/source/index.rst b/doc/source/index.rst
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -465,10 +465,21 @@
Note that callbacks of a variadic function type are not supported.
+Be careful when writing the Python callback function: if it returns an
+object of the wrong type, or more generally raises an exception, then
+the exception cannot be propagated. Instead, it is printed to stderr
+and the C-level callback is made to return, randomly, a null value.
+
Miscellaneous
-------------
+``errno``: the value of ``errno`` received from the most recent C call
+in this thread, and passed to the following C call, is available via
+``ffi.dlopen(None).errno`` as a global variable of the C standard
+library. It can also be accessed more directly via reads and writes of
+``ffi.errno``.
+
``ffi.string(pointer, length)``: return a Python string containing all
the data at the given location with the given size. The pointer must be
a cdata of type ``void *`` or ``char *``. Null characters are not
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