mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-10 13:00:29 +03:00
108 lines
4.1 KiB
C++
108 lines
4.1 KiB
C++
/*
|
|
* Copyright (c) 2020-2022, the SerenityOS developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <unistd.h>
|
|
|
|
// Supposed to use volatile everywhere here but good lord does C++ make that a pain
|
|
volatile sig_atomic_t saved_signal;
|
|
volatile siginfo_t saved_siginfo;
|
|
volatile ucontext_t saved_ucontext;
|
|
siginfo_t* sig_info_addr;
|
|
ucontext_t* ucontext_addr;
|
|
void* stack_ptr;
|
|
bool volatile signal_was_delivered = false;
|
|
|
|
static void signal_handler(int sig, siginfo_t* sig_info, void* u_context)
|
|
{
|
|
stack_ptr = __builtin_frame_address(0);
|
|
signal_was_delivered = true;
|
|
|
|
saved_signal = sig;
|
|
// grumble grumble, assignment operator on volatile types not a thing
|
|
// grumble grumble more, can't memcpy voltile either, that casts away volatile
|
|
// grumble grumble even more, can't std::copy to volatile.
|
|
// screw it, just write all the fields
|
|
sig_info_addr = sig_info;
|
|
saved_siginfo.si_status = sig_info->si_status;
|
|
saved_siginfo.si_signo = sig_info->si_signo;
|
|
saved_siginfo.si_code = sig_info->si_code;
|
|
saved_siginfo.si_pid = sig_info->si_pid;
|
|
saved_siginfo.si_uid = sig_info->si_uid;
|
|
saved_siginfo.si_value.sival_int = sig_info->si_value.sival_int;
|
|
auto user_context = (ucontext_t*)u_context;
|
|
ucontext_addr = user_context;
|
|
saved_ucontext.uc_link = user_context->uc_link;
|
|
saved_ucontext.uc_sigmask = user_context->uc_sigmask;
|
|
saved_ucontext.uc_stack.ss_sp = user_context->uc_stack.ss_sp;
|
|
saved_ucontext.uc_stack.ss_size = user_context->uc_stack.ss_size;
|
|
saved_ucontext.uc_stack.ss_flags = user_context->uc_stack.ss_flags;
|
|
// saved_ucontext.uc_mcontext = user_context->uc_mcontext;
|
|
}
|
|
|
|
static int print_signal_results()
|
|
{
|
|
if (!signal_was_delivered) {
|
|
fprintf(stderr, "Where was my signal bro?\n");
|
|
return 2;
|
|
}
|
|
|
|
sig_atomic_t read_the_signal = saved_signal;
|
|
siginfo_t read_the_siginfo = {};
|
|
read_the_siginfo.si_status = saved_siginfo.si_status;
|
|
read_the_siginfo.si_signo = saved_siginfo.si_signo;
|
|
read_the_siginfo.si_code = saved_siginfo.si_code;
|
|
read_the_siginfo.si_pid = saved_siginfo.si_pid;
|
|
read_the_siginfo.si_uid = saved_siginfo.si_uid;
|
|
read_the_siginfo.si_value.sival_int = saved_siginfo.si_value.sival_int;
|
|
|
|
ucontext_t read_the_ucontext = {};
|
|
read_the_ucontext.uc_link = saved_ucontext.uc_link;
|
|
read_the_ucontext.uc_sigmask = saved_ucontext.uc_sigmask;
|
|
read_the_ucontext.uc_stack.ss_sp = saved_ucontext.uc_stack.ss_sp;
|
|
read_the_ucontext.uc_stack.ss_size = saved_ucontext.uc_stack.ss_size;
|
|
read_the_ucontext.uc_stack.ss_flags = saved_ucontext.uc_stack.ss_flags;
|
|
// read_the_ucontext.uc_mcontext = saved_ucontext.uc_mcontext;
|
|
|
|
printf("Handled signal: %d\n", read_the_signal);
|
|
printf("Stack sorta started as %p\n", stack_ptr);
|
|
printf("Siginfo was stored at %p:\n", sig_info_addr);
|
|
printf("\tsi_signo: %d\n", read_the_siginfo.si_signo);
|
|
printf("\tsi_code, %x\n", read_the_siginfo.si_code);
|
|
printf("\tsi_pid, %d\n", read_the_siginfo.si_pid);
|
|
printf("\tsi_uid, %d\n", read_the_siginfo.si_uid);
|
|
printf("\tsi_status, %x\n", read_the_siginfo.si_status);
|
|
printf("\tsi_value.sival_int, %x\n", read_the_siginfo.si_value.sival_int);
|
|
printf("ucontext was stored at %p:\n", ucontext_addr);
|
|
printf("\tuc_link, %p\n", read_the_ucontext.uc_link);
|
|
printf("\tuc_sigmask, %d\n", read_the_ucontext.uc_sigmask);
|
|
printf("\tuc_stack.ss_sp, %p\n", read_the_ucontext.uc_stack.ss_sp);
|
|
printf("\tuc_stack.ss_size, %zu\n", read_the_ucontext.uc_stack.ss_size);
|
|
printf("\tuc_stack.ss_flags, %d\n", read_the_ucontext.uc_stack.ss_flags);
|
|
// printf("\tuc_mcontext, %d\n", read_the_ucontext.uc_mcontext);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
struct sigaction action = {};
|
|
action.sa_flags = SA_SIGINFO;
|
|
sigemptyset(&action.sa_mask);
|
|
action.sa_sigaction = signal_handler;
|
|
|
|
for (size_t i = 0; i < NSIG; ++i)
|
|
(void)sigaction(i, &action, nullptr);
|
|
|
|
printf("Sleeping for a long time waiting for kill -<N> %d\n", getpid());
|
|
|
|
sleep(1000);
|
|
return print_signal_results();
|
|
}
|