[Solved] while loop exit, without well-known way [closed]

Use goto:

This will only exit the while loop.

while (true) { 
    ...
    if (some condition) {
        goto CLEANUP;
    }
    ...
}
CLEANUP:
...

exit() the program:

while (true) {
    ...
    if (some condition) {
       exit (EXIT_FAILURE);
       
       /* OR, if in the `main()` function: */
       return EXIT_FAILURE;
    }
    ....
}

abort() the program:

while (true) { 
    ...
    if (some condition) {
        abort ();
    }
    ...
}

Some other alternatives, that will do much more than just exit the while loop, include:

• The raise() function.
• The quick_exit() function.
• The _Exit() function.
• The _exit function. (Note that this is not defined in the C standard, it is a POSIX extension)