8000 bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module by tiran · Pull Request #31759 · python/cpython · GitHub
[go: up one dir, main page]
Skip to content

bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module #31759

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 4 commits into from
Mar 8, 2022
Merged

bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module #31759

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
fdd38cb
bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module
tiran Mar 8, 2022
3438104
Fix comparison in PyErr_SetInterruptEx()
tiran Mar 8, 2022
cc4df05
Compare handler in a safe helper function
tiran Mar 8, 2022
76e3135
Use right order of arguments
tiran Mar 8, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
Next Next commit
bpo-23325: Fix SIG_IGN and SIG_DFL int comparison in signal module
  • Loading branch information
@tiran
tiran committed Mar 8, 2022
commit fdd38cb16aea0aa44265a5b9395f8fe9bf56db7b
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2022-03-08-11-34-06.bpo-23325.3VQnfo.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
The :mod:`signal` module no longer assumes that :const:`~signal.SIG_IGN` and
:const:`~signal.SIG_DFL` are small int singletons.
34 changes: 26 additions & 8 deletions Modules/signalmodule.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -496,6 +496,7 @@ signal_signal_impl(PyObject *module, int signalnum, PyObject *handler)
_signal_module_state *modstate = get_signal_state(module);
PyObject *old_handler;
void (*func)(int);
int match = 0; // cannot use func == NULL as sentinel, SIG_DFL == 0
#ifdef MS_WINDOWS
/* Validate that signalnum is one of the allowable signals */
switch (signalnum) {
Expand Down Expand Up @@ -528,21 +529,38 @@ signal_signal_impl(PyObject *module, int signalnum, PyObject *handler)
"signal number out of range");
return NULL;
}
if (handler == modstate->ignore_handler) {
func = SIG_IGN;
if (PyCallable_Check(handler)) {
func = signal_handler;
match = 1;
}
else if (handler == modstate->default_handler) {
func = SIG_DFL;
if (!match) {
int cmp = PyObject_RichCompareBool(handler, modstate->ignore_handler, Py_EQ);
switch (cmp) {
case -1:
return NULL;
case 1:
func = SIG_IGN;
match = 1;
break;
}
}
else if (!PyCallable_Check(handler)) {
if (!match) {
int cmp = PyObject_RichCompareBool(handler, modstate->default_handler, Py_EQ);
switch (cmp) {
case -1:
return NULL;
case 1:
func = SIG_DFL;
match = 1;
break;
}
}
if (!match) {
_PyErr_SetString(tstate, PyExc_TypeError,
"signal handler must be signal.SIG_IGN, "
"signal.SIG_DFL, or a callable object");
return NULL;
}
else {
func = signal_handler;
}

/* Check for pending signals before changing signal handler */
if (_PyErr_CheckSignalsTstate(tstate)) {
Expand Down
0