I am writing a program on Mac OSX depending on the sigaction/sa_handler mechanism. Run a code snippet from user and get ready to catch signals/exceptions at any time. The progra
We can do it easily. Just add this code.
#include
#include
#include
int ret = task_set_exception_ports(
mach_task_self(),
EXC_MASK_BAD_ACCESS,
MACH_PORT_NULL,//m_exception_port,
EXCEPTION_DEFAULT,
0);
Don't forget to do this
proc hand -p true -s false SIGSEGV
proc hand -p true -s false SIGBUS
Full code:
#include
#include
#include
#include
#include
#include
#include
#include
static void handler(int signo, siginfo_t *sigaction, void *context)
{
printf("in handler.\n");
signal(signo, SIG_DFL);
}
static void gen_exception()
{
printf("gen_exception in.\n");
*(int *)0 = 0;
printf("gen_exception out.\n");
}
void *gen_exception_thread(void *parg)
{
gen_exception();
return 0;
}
int main()
{
task_set_exception_ports(
mach_task_self(),
EXC_MASK_BAD_ACCESS,
MACH_PORT_NULL,//m_exception_port,
EXCEPTION_DEFAULT,
0);
struct sigaction sa;
sa.sa_sigaction = handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
if(sigaction(/*SIGBUS*/SIGSEGV, &sa, NULL) == -1) {
printf("sigaction fails.\n");
return 0;
}
pthread_t id;
pthread_create(&id, NULL, gen_exception_thread, NULL);
pthread_join(id, NULL);
return 0;
}
Refer to (Chinese article): https://zhuanlan.zhihu.com/p/33542591