#include <signal.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <darwintest.h> static uint64_t stack_base, stack_end; static void signal_handler(int __unused signum, struct __siginfo * __unused info, void * __unused uap) { T_LOG("In signal handler\n"); uint64_t signal_stack = (uint64_t)__builtin_frame_address(0); T_ASSERT_LE(stack_base, signal_stack, NULL); T_ASSERT_LE(signal_stack, stack_end, NULL); T_END; } T_DECL(signalstack, "Check that the signal stack is set up correctly", T_META_ASROOT(YES)) { void* stack_allocation = malloc(SIGSTKSZ); stack_base = (uint64_t)stack_allocation; stack_end = stack_base + SIGSTKSZ; T_LOG("stack base = 0x%llx\n", stack_base); T_LOG("stack end = 0x%llx\n", stack_end); stack_t alt_stack; alt_stack.ss_sp = stack_allocation; alt_stack.ss_size = SIGSTKSZ; alt_stack.ss_flags = 0; if (sigaltstack(&alt_stack, NULL) < 0) { T_FAIL("error: sigaltstack failed\n"); } sigset_t signal_mask; sigemptyset(&signal_mask); struct sigaction sig_action; sig_action.sa_sigaction = signal_handler; sig_action.sa_mask = signal_mask; sig_action.sa_flags = SA_ONSTACK; if (sigaction(SIGUSR1, &sig_action, NULL) != 0) { T_FAIL("error: sigaction failed\n"); } T_LOG("Sending a SIGUSR1\n"); kill(getpid(), SIGUSR1); return; }