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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* test_signal.cc — Self-tests for signal infrastructure
*
* Tests the kernel-internal signal APIs directly (not via syscalls,
* since syscalls use copy_to_user which rejects kernel-space buffers).
*/
#include <lume/selftest.h>
#include <lume/signal.h>
#include <lume/signal_types.h>
#include <lume/signal_nr.h>
#include <lume/task.h>
#include <lume/errno.h>
#include <lume/new.h>
/* From signal.cc */
extern int send_signal(int sig, kernel_siginfo* info, TaskControlBlock* task);
/* Drain all queued sigqueue entries from a task's pending list */
static void flush_pending(TaskControlBlock* task)
{
task->pending.signal = sigset_t{};
list_node* head = &task->pending.list;
while (head->next != head) {
list_node* node = head->next;
head->next = node->next;
node->next->prev = head;
auto* q = list_entry<sigqueue, &sigqueue::list>(node);
delete q;
}
}
void selftest_signal()
{
TaskControlBlock* curr = current_task();
/* Ensure sighand exists for this task */
if (!curr->sighand) {
curr->sighand = new sighand_struct;
curr->sighand->init();
}
/* Ensure pending list is initialized */
if (curr->pending.list.next == nullptr) {
curr->pending.list.next = &curr->pending.list;
curr->pending.list.prev = &curr->pending.list;
curr->pending.signal = sigset_t{};
}
/* ---- send_signal queues a signal ---- */
st_begin("signal: send_signal queues to pending");
{
curr->pending.signal = sigset_t{};
kernel_siginfo info{};
info.si_signo = SIGUSR1;
info.si_code = 0;
int ret = send_signal(SIGUSR1, &info, curr);
ST_ASSERT_EQ(ret, 0);
ST_ASSERT(curr->pending.signal.has(SIGUSR1));
flush_pending(curr);
}
st_pass();
/* ---- send_signal: invalid signal returns -EINVAL ---- */
st_begin("signal: send_signal invalid sig returns -EINVAL");
{
int ret = send_signal(0, nullptr, curr);
ST_ASSERT_EQ(ret, -EINVAL);
ret = send_signal(_NSIG + 1, nullptr, curr);
ST_ASSERT_EQ(ret, -EINVAL);
}
st_pass();
/* ---- send_signal: null task returns -ESRCH ---- */
st_begin("signal: send_signal null task returns -ESRCH");
{
int ret = send_signal(SIGUSR1, nullptr, nullptr);
ST_ASSERT_EQ(ret, -ESRCH);
}
st_pass();
/* ---- duplicate standard signal is coalesced ---- */
st_begin("signal: duplicate standard signal coalesced");
{
curr->pending.signal = sigset_t{};
send_signal(SIGUSR1, nullptr, curr);
ST_ASSERT(curr->pending.signal.has(SIGUSR1));
int ret = send_signal(SIGUSR1, nullptr, curr);
ST_ASSERT_EQ(ret, 0);
flush_pending(curr);
}
st_pass();
/* ---- sigset_t: add/del/has ---- */
st_begin("signal: sigset_t add/del/has");
{
sigset_t s{};
ST_ASSERT(!s.has(SIGUSR1));
s.add(SIGUSR1);
ST_ASSERT(s.has(SIGUSR1));
s.del(SIGUSR1);
ST_ASSERT(!s.has(SIGUSR1));
}
st_pass();
/* ---- sigset_t: bitwise operators ---- */
st_begin("signal: sigset_t bitwise OR and AND");
{
sigset_t a{};
a.add(SIGUSR1);
sigset_t b{};
b.add(SIGUSR2);
sigset_t c = a | b;
ST_ASSERT(c.has(SIGUSR1));
ST_ASSERT(c.has(SIGUSR2));
sigset_t d = c & a;
ST_ASSERT(d.has(SIGUSR1));
ST_ASSERT(!d.has(SIGUSR2));
}
st_pass();
/* ---- blocked mask: direct manipulation ---- */
st_begin("signal: blocked mask direct manipulation");
{
sigset_t saved = curr->blocked;
curr->blocked = sigset_t{};
curr->blocked.add(SIGUSR1);
curr->blocked.add(SIGUSR2);
ST_ASSERT(curr->blocked.has(SIGUSR1));
ST_ASSERT(curr->blocked.has(SIGUSR2));
curr->blocked.del(SIGUSR1);
ST_ASSERT(!curr->blocked.has(SIGUSR1));
ST_ASSERT(curr->blocked.has(SIGUSR2));
curr->blocked = saved;
}
st_pass();
/* ---- sighand action table ---- */
st_begin("signal: sighand action table defaults to SIG_DFL");
{
/* All handlers should default to SIG_DFL (0) */
kernel_sigaction* ka = &curr->sighand->action[SIGUSR1 - 1];
ST_ASSERT_EQ(ka->sa_handler, (uint64)SIG_DFL);
/* Set a handler and verify */
ka->sa_handler = 0x12345678ULL;
ST_ASSERT_EQ(ka->sa_handler, (uint64)0x12345678ULL);
/* Reset */
ka->sa_handler = SIG_DFL;
}
st_pass();
/* ---- sig_kernel_only rejects SIGKILL/SIGSTOP handlers ---- */
st_begin("signal: SIGKILL/SIGSTOP are kernel-only");
{
ST_ASSERT(sig_kernel_only(SIGKILL));
ST_ASSERT(sig_kernel_only(SIGSTOP));
ST_ASSERT(!sig_kernel_only(SIGUSR1));
ST_ASSERT(!sig_kernel_only(SIGINT));
}
st_pass();
/* ---- sig_default_action correctness ---- */
st_begin("signal: sig_default_action returns correct actions");
{
ST_ASSERT_EQ((int)sig_default_action(SIGCHLD), (int)SIG_ACT_IGN);
ST_ASSERT_EQ((int)sig_default_action(SIGKILL), (int)SIG_ACT_TERM);
ST_ASSERT_EQ((int)sig_default_action(SIGSTOP), (int)SIG_ACT_STOP);
ST_ASSERT_EQ((int)sig_default_action(SIGCONT), (int)SIG_ACT_CONT);
ST_ASSERT_EQ((int)sig_default_action(SIGSEGV), (int)SIG_ACT_CORE);
}
st_pass();
/* Clean up */
flush_pending(curr);
curr->blocked = sigset_t{};
}
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