Good question.

A friend way I knew is to catch the system signal to exit the process.

The code listed below:

void releaseYourMemory()
{
    //TODO release your memory
}

void func1()
{
    releaseYourMemory();

    exit(0);
}

void func2()
{
    releaseYourMemory();

    exit(0);
}

void func3()
{
    releaseYourMemory();

    exit(0);
}

void main()
{

    signal (SIGINT, func1);

    signal(SIGKILL, func0);

    signal(SIGSEGV, func3);

    signal(SIGTERM, func2);

    while (1)
    {
        //your loop
    }

}

Welcome to post your PR after you have tested it.

Thanks.

The routine handler must be very careful, since processing elsewhere was interrupted at some arbitrary point. POSIX has the concept of "safe function". If a signal interrupts an unsafe function, and handler calls an unsafe function, then the behavior is undefined. Safe functions are listed explicitly in the various standards. The POSIX.1-2003 list is

_Exit() _exit() abort() accept() access() aio_error() aio_return() aio_suspend() alarm() bind() cfgetispeed() cfgetospeed() cfsetispeed() cfsetospeed() chdir() chmod() chown() clock_gettime() close() connect() creat() dup() dup2() execle() execve() fchmod() fchown() fcntl() fdatasync() fork() fpathconf() fstat() fsync() ftruncate() getegid() geteuid() getgid() getgroups() getpeername() getpgrp() getpid() getppid() getsockname() getsockopt() getuid() kill() link() listen() lseek() lstat() mkdir() mkfifo() open() pathconf() pause() pipe() poll() posix_trace_event() pselect() raise() read() readlink() recv() recvfrom() recvmsg() rename() rmdir() select() sem_post() send() sendmsg() sendto() setgid() setpgid() setsid() setsockopt() setuid() shutdown() sigaction() sigaddset() sigdelset() sigemptyset() sigfillset() sigismember() signal() sigpause() sigpending() sigprocmask() sigqueue() sigset() sigsuspend() sleep() socket() socketpair() stat() symlink() sysconf() tcdrain() tcflow() tcflush() tcgetattr() tcgetpgrp() tcsendbreak() tcsetattr() tcsetpgrp() time() timer_getoverrun() timer_gettime() timer_settime() times() umask() uname() unlink() utime() wait() waitpid() write().

https://www.tutorialspoint.com/unix_system_calls/signal.htm