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Handle SIGXCPU like a regular timeout (#9697)

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Z3's -T measures wall clock time, whereas `ulimit -t` measures CPU time.
Currently, an expired ulimit timeout crashes Z3 without printing
statistics; this patch makes it react cleanly (just as if it has
encountered a regular timeout) to SIGXCPU, the signal that ulimit sends
before sending SIGKILL.
This commit is contained in:
Clément Pit-Claudel 2026-06-03 16:26:38 +02:00 • committed by GitHub
parent 922f49e187
commit 1d706e875c
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GPG key ID: B5690EEEBB952194
2 changed files with 23 additions and 4 deletions
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26
src/util/timeout.cpp
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@ -19,6 +19,7 @@ Revision History:
--*/
#include<iostream>
#include<signal.h>
#include "util/util.h"
#include "util/timeout.h"
#include "util/error_codes.h"
@ -29,15 +30,28 @@ Revision History:
static scoped_timer * g_timeout = nullptr;
static void (* g_on_timeout)() = nullptr;
static void do_timeout() {
std::cout << "timeout\n";
std::cout.flush();
if (g_on_timeout)
g_on_timeout();
}
#ifdef SIGXCPU
// React to SIGXCPU (an external CPU limit, e.g. ulimit -t) like a -T timeout.
static void STD_CALL on_sigxcpu(int) {
signal(SIGXCPU, SIG_DFL);
do_timeout();
raise(SIGXCPU);
}
#endif
namespace {
class g_timeout_eh : public event_handler {
public:
void operator()(event_handler_caller_t caller_id) override {
m_caller_id = caller_id;
std::cout << "timeout\n";
std::cout.flush();
if (g_on_timeout)
g_on_timeout();
do_timeout();
throw z3_error(ERR_TIMEOUT);
}
};
@ -56,4 +70,8 @@ void disable_timeout() {
void register_on_timeout_proc(void (*proc)()) {
g_on_timeout = proc;
#ifdef SIGXCPU
// Handle external CPU limits (SIGXCPU) like our own timeouts.
signal(SIGXCPU, on_sigxcpu);
#endif
}