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Issue #23668: Adds support for os.truncate and os.ftruncate on Windows

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This commit is contained in:
Steve Dower 2015-03-20 19:50:46 -07:00
parent c7d979f022
commit fe0a41aae4
5 changed files with 53 additions and 63 deletions
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45
Modules/posixmodule.c
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@ -2315,6 +2315,10 @@ FTRUNCATE
#endif
/*[python end generated code: output=4bd4f6f7d41267f1 input=80b4c890b6774ea5]*/
#ifdef MS_WINDOWS
#undef PATH_HAVE_FTRUNCATE
#define PATH_HAVE_FTRUNCATE 1
#endif
/*[python input]
@ -8753,7 +8757,7 @@ os_makedev_impl(PyModuleDef *module, int major, int minor)
#endif /* HAVE_DEVICE_MACROS */
#ifdef HAVE_FTRUNCATE
#if defined HAVE_FTRUNCATE || defined MS_WINDOWS
/*[clinic input]
os.ftruncate
@ -8771,9 +8775,16 @@ os_ftruncate_impl(PyModuleDef *module, int fd, Py_off_t length)
int result;
int async_err = 0;
if (!_PyVerify_fd(fd))
return posix_error();
do {
Py_BEGIN_ALLOW_THREADS
#ifdef MS_WINDOWS
result = _chsize_s(fd, length);
#else
result = ftruncate(fd, length);
#endif
Py_END_ALLOW_THREADS
} while (result != 0 && errno == EINTR &&
!(async_err = PyErr_CheckSignals()));
@ -8781,10 +8792,10 @@ os_ftruncate_impl(PyModuleDef *module, int fd, Py_off_t length)
return (!async_err) ? posix_error() : NULL;
Py_RETURN_NONE;
}
#endif /* HAVE_FTRUNCATE */
#endif /* HAVE_FTRUNCATE || MS_WINDOWS */
#ifdef HAVE_TRUNCATE
#if defined HAVE_TRUNCATE || defined MS_WINDOWS
/*[clinic input]
os.truncate
path: path_t(allow_fd='PATH_HAVE_FTRUNCATE')
@ -8801,21 +8812,37 @@ os_truncate_impl(PyModuleDef *module, path_t *path, Py_off_t length)
/*[clinic end generated code: output=f60a9e08370e9e2e input=77229cf0b50a9b77]*/
{
int result;
#ifdef MS_WINDOWS
int fd;
#endif
if (path->fd != -1)
return os_ftruncate_impl(module, path->fd, length);
Py_BEGIN_ALLOW_THREADS
#ifdef HAVE_FTRUNCATE
if (path->fd != -1)
result = ftruncate(path->fd, length);
#ifdef MS_WINDOWS
if (path->wide)
fd = _wopen(path->wide, _O_WRONLY | _O_BINARY | _O_NOINHERIT);
else
fd = _open(path->narrow, _O_WRONLY | _O_BINARY | _O_NOINHERIT);
if (fd < 0)
result = -1;
else {
result = _chsize_s(fd, length);
close(fd);
if (result < 0)
errno = result;
}
#else
result = truncate(path->narrow, length);
#endif
result = truncate(path->narrow, length);
Py_END_ALLOW_THREADS
if (result < 0)
return path_error(path);
Py_RETURN_NONE;
}
#endif /* HAVE_TRUNCATE */
#endif /* HAVE_TRUNCATE || MS_WINDOWS */
/* Issue #22396: On 32-bit AIX platform, the prototypes of os.posix_fadvise()
@ -12771,7 +12798,7 @@ static char *have_functions[] = {
"HAVE_FSTATVFS",
#endif
#ifdef HAVE_FTRUNCATE
#if defined HAVE_FTRUNCATE || defined MS_WINDOWS
"HAVE_FTRUNCATE",
#endif