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bpo-24658: Fix read/write greater than 2 GiB on macOS (GH-1705)

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On macOS, fix reading from and writing into a file with a size larger than 2 GiB.
This commit is contained in:
Stéphane Wirtel 2018-10-18 01:05:04 +02:00 • committed by Victor Stinner
parent 0f11a88622
commit 74a8b6ea7e
5 changed files with 33 additions and 26 deletions
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13
Include/fileutils.h
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@ -81,6 +81,19 @@ PyAPI_FUNC(int) _Py_EncodeLocaleEx(
#ifndef Py_LIMITED_API
PyAPI_FUNC(PyObject *) _Py_device_encoding(int);
#if defined(MS_WINDOWS) || defined(__APPLE__)
/* On Windows, the count parameter of read() is an int (bpo-9015, bpo-9611).
On macOS 10.13, read() and write() with more than INT_MAX bytes
fail with EINVAL (bpo-24658). */
# define _PY_READ_MAX INT_MAX
# define _PY_WRITE_MAX INT_MAX
#else
/* write() should truncate the input to PY_SSIZE_T_MAX bytes,
but it's safer to do it ourself to have a portable behaviour */
# define _PY_READ_MAX PY_SSIZE_T_MAX
# define _PY_WRITE_MAX PY_SSIZE_T_MAX
#endif
#ifdef MS_WINDOWS
struct _Py_stat_struct {
unsigned long st_dev;