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bpo-41001: Add os.eventfd() (#20930)

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Co-authored-by: Kyle Stanley <aeros167@gmail.com>
This commit is contained in:
Christian Heimes 2020-11-13 19:48:52 +01:00 • committed by GitHub
parent bbeb2d266d
commit cd9fed6afb
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9 changed files with 471 additions and 3 deletions
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91
Modules/posixmodule.c
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@ -518,6 +518,11 @@ extern char *ctermid_r(char *);
# include <linux/memfd.h>
#endif
/* eventfd() */
#ifdef HAVE_SYS_EVENTFD_H
# include <sys/eventfd.h>
#endif
#ifdef _Py_MEMORY_SANITIZER
# include <sanitizer/msan_interface.h>
#endif
@ -12859,6 +12864,79 @@ os_memfd_create_impl(PyObject *module, PyObject *name, unsigned int flags)
}
#endif
#ifdef HAVE_EVENTFD
/*[clinic input]
os.eventfd
initval: unsigned_int
flags: int(c_default="EFD_CLOEXEC") = EFD_CLOEXEC
Creates and returns an event notification file descriptor.
[clinic start generated code]*/
static PyObject *
os_eventfd_impl(PyObject *module, unsigned int initval, int flags)
/*[clinic end generated code: output=ce9c9bbd1446f2de input=66203e3c50c4028b]*/
{
/* initval is limited to uint32_t, internal counter is uint64_t */
int fd;
Py_BEGIN_ALLOW_THREADS
fd = eventfd(initval, flags);
Py_END_ALLOW_THREADS
if (fd == -1) {
return PyErr_SetFromErrno(PyExc_OSError);
}
return PyLong_FromLong(fd);
}
/*[clinic input]
os.eventfd_read
fd: fildes
Read eventfd value
[clinic start generated code]*/
static PyObject *
os_eventfd_read_impl(PyObject *module, int fd)
/*[clinic end generated code: output=8f2c7b59a3521fd1 input=110f8b57fa596afe]*/
{
eventfd_t value;
int result;
Py_BEGIN_ALLOW_THREADS
result = eventfd_read(fd, &value);
Py_END_ALLOW_THREADS
if (result == -1) {
return PyErr_SetFromErrno(PyExc_OSError);
}
return PyLong_FromUnsignedLongLong(value);
}
/*[clinic input]
os.eventfd_write
fd: fildes
value: unsigned_long_long
Write eventfd value.
[clinic start generated code]*/
static PyObject *
os_eventfd_write_impl(PyObject *module, int fd, unsigned long long value)
/*[clinic end generated code: output=bebd9040bbf987f5 input=156de8555be5a949]*/
{
int result;
Py_BEGIN_ALLOW_THREADS
result = eventfd_write(fd, value);
Py_END_ALLOW_THREADS
if (result == -1) {
return PyErr_SetFromErrno(PyExc_OSError);
}
Py_RETURN_NONE;
}
#endif /* HAVE_EVENTFD */
/* Terminal size querying */
PyDoc_STRVAR(TerminalSize_docstring,
@ -14619,6 +14697,9 @@ static PyMethodDef posix_methods[] = {
OS_FSPATH_METHODDEF
OS_GETRANDOM_METHODDEF
OS_MEMFD_CREATE_METHODDEF
OS_EVENTFD_METHODDEF
OS_EVENTFD_READ_METHODDEF
OS_EVENTFD_WRITE_METHODDEF
OS__ADD_DLL_DIRECTORY_METHODDEF
OS__REMOVE_DLL_DIRECTORY_METHODDEF
OS_WAITSTATUS_TO_EXITCODE_METHODDEF
@ -15127,6 +15208,12 @@ all_ins(PyObject *m)
#ifdef MFD_HUGE_16GB
if (PyModule_AddIntMacro(m, MFD_HUGE_16GB)) return -1;
#endif
#endif /* HAVE_MEMFD_CREATE */
#ifdef HAVE_EVENTFD
if (PyModule_AddIntMacro(m, EFD_CLOEXEC)) return -1;
if (PyModule_AddIntMacro(m, EFD_NONBLOCK)) return -1;
if (PyModule_AddIntMacro(m, EFD_SEMAPHORE)) return -1;
#endif
#if defined(__APPLE__)
@ -15220,6 +15307,10 @@ static const struct have_function {
int (*probe)(void);
} have_functions[] = {
#ifdef HAVE_EVENTFD
{"HAVE_EVENTFD", NULL},
#endif
#ifdef HAVE_FACCESSAT
{ "HAVE_FACCESSAT", probe_faccessat },
#endif