Issue #8407: The signal handler writes the signal number as a single byte
instead of a nul byte into the wakeup file descriptor. So it is possible to
wait more than one signal and know which signals were raised.
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index 7285079..7e07b3e 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -176,6 +176,7 @@
static void
trip_signal(int sig_num)
{
+ unsigned char byte;
Handlers[sig_num].tripped = 1;
if (is_tripped)
return;
@@ -183,8 +184,10 @@
cleared in PyErr_CheckSignals() before .tripped. */
is_tripped = 1;
Py_AddPendingCall(checksignals_witharg, NULL);
- if (wakeup_fd != -1)
- write(wakeup_fd, "\0", 1);
+ if (wakeup_fd != -1) {
+ byte = (unsigned char)sig_num;
+ write(wakeup_fd, &byte, 1);
+ }
}
static void