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Support alternate signal stack

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This commit is contained in:
Jianfeng Jiang
2023-09-27 10:06:02 +08:00
committed by Tate, Hongliang Tian
parent 3734306398
commit a91a35ebce
9 changed files with 362 additions and 38 deletions
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72
regression/apps/signal_c/signal_test.c
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@ -265,6 +265,7 @@ int test_sigchld() {
// child process
printf("create a new proces successfully (pid = %d)\n", getpid());
fflush(stdout);
exit(0);
} else {
// parent process
wait(NULL);
@ -274,11 +275,82 @@ int test_sigchld() {
return 0;
}
// ============================================================================
// Test handle signal on alternate signal stack
// ============================================================================
#define MAX_ALTSTACK_RECURSION_LEVEL 2
stack_t g_old_ss;
static void handle_sigpipe(int num, siginfo_t *info, void *context) {
static volatile int recursion_level = 0;
printf("Hello from SIGPIPE signal handler on the alternate signal stack (recursion_level = %d)\n",
recursion_level);
// save old_ss to check if we are on stack
stack_t old_ss;
sigaltstack(NULL, &old_ss);
g_old_ss = old_ss;
recursion_level++;
if (recursion_level <= MAX_ALTSTACK_RECURSION_LEVEL) {
raise(SIGPIPE);
}
recursion_level--;
}
#define SIGSTACKSIZE (4*4096)
int test_sigaltstack() {
static char stack[SIGSTACKSIZE];
stack_t expected_ss = {
.ss_size = SIGSTACKSIZE,
.ss_sp = stack,
.ss_flags = 0,
};
if (sigaltstack(&expected_ss, NULL) < 0) {
THROW_ERROR("failed to call sigaltstack");
}
stack_t actual_ss;
if (sigaltstack(NULL, &actual_ss) < 0) {
THROW_ERROR("failed to call sigaltstack");
}
if (actual_ss.ss_size != expected_ss.ss_size
|| actual_ss.ss_sp != expected_ss.ss_sp
|| actual_ss.ss_flags != expected_ss.ss_flags) {
THROW_ERROR("failed to check the signal stack after set");
}
struct sigaction new_action, old_action;
memset(&new_action, 0, sizeof(struct sigaction));
memset(&old_action, 0, sizeof(struct sigaction));
new_action.sa_sigaction = handle_sigpipe;
new_action.sa_flags = SA_SIGINFO | SA_NODEFER | SA_ONSTACK;
if (sigaction(SIGPIPE, &new_action, &old_action) < 0) {
THROW_ERROR("registering new signal handler failed");
}
if (old_action.sa_handler != SIG_DFL) {
THROW_ERROR("unexpected old sig handler");
}
raise(SIGPIPE);
if (g_old_ss.ss_flags != SS_ONSTACK) {
THROW_ERROR("check stack flags failed");
}
if (sigaction(SIGPIPE, &old_action, NULL) < 0) {
THROW_ERROR("restoring old signal handler failed");
}
return 0;
}
int main() {
test_sigprocmask();
test_raise();
test_handle_sigfpe();
test_handle_sigsegv();
test_sigchld();
test_sigaltstack();
return 0;
}