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Set the SA_ONSTACK flag for SIGINT handlers

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Golang requires the SA_ONSTACK flag to be set on all signal handlers
(https://pkg.go.dev/os/signal#hdr-Go_programs_that_use_cgo_or_SWIG).
This commit adds the SA_ONSTACK flag to SIGINT handlers in
src/util/scoped_ctrl_c.cpp. Although signals are registered in other
parts of the code base, they are not exposed through the C api (i.e., in
/src/test, /src/shell, and /src/api).
This commit is contained in:
Tibor Schneider 2024-07-23 17:22:57 -07:00
parent 1e6b13741c
commit 6f6e7b40a5
1 changed files with 17 additions and 6 deletions
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23
src/util/scoped_ctrl_c.cpp
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@ -21,37 +21,48 @@ Revision History:
static scoped_ctrl_c * g_obj = nullptr;
static void (*signal_sigint(void (*eh)(int)))(int) {
void (*old_eh)(int);
struct sigaction action;
sigaction(SIGINT, NULL, &action);
old_eh = action.sa_handler;
action.sa_handler = eh;
action.sa_flags |= SA_ONSTACK;
sigaction(SIGINT, &action, NULL);
return old_eh;
}
static void on_ctrl_c(int) {
if (g_obj->m_first) {
g_obj->m_cancel_eh(CTRL_C_EH_CALLER);
if (g_obj->m_once) {
g_obj->m_first = false;
signal(SIGINT, on_ctrl_c); // re-install the handler
signal_sigint(on_ctrl_c); // re-install the handler
}
}
else {
signal(SIGINT, g_obj->m_old_handler);
signal_sigint(g_obj->m_old_handler);
raise(SIGINT);
}
}
scoped_ctrl_c::scoped_ctrl_c(event_handler & eh, bool once, bool enabled):
m_cancel_eh(eh),
m_cancel_eh(eh),
m_first(true),
m_once(once),
m_enabled(enabled),
m_old_scoped_ctrl_c(g_obj) {
if (m_enabled) {
g_obj = this;
m_old_handler = signal(SIGINT, on_ctrl_c);
m_old_handler = signal_sigint(on_ctrl_c);
}
}
scoped_ctrl_c::~scoped_ctrl_c() {
scoped_ctrl_c::~scoped_ctrl_c() {
if (m_enabled) {
g_obj = m_old_scoped_ctrl_c;
if (m_old_handler != SIG_ERR) {
signal(SIGINT, m_old_handler);
signal_sigint(m_old_handler);
}
}
}