This commit contains the following changes:
- Call `waitpid()` on the child and the fork server when terminating the
fuzzer; thus, we do not end up with zombies.
- Rename `fsrv.kill_signal` to `fsrv.child_kill_signal`, since the
documentation states that the signal is used to terminate the *child*.
- Use SIGTERM instead of fsrv.(child)_kill_signal, thus the fork server
can always reap the child.
* Variable AFL_EXIT_ON_TIME description has been added.
Variables AFL_EXIT_ON_TIME and afl_exit_on_time has been added.
afl->exit_on_time variable initialization has been added.
The asignment of a value to the afl->afl_env.afl_exit_on_time variable from
environment variables has been added.
Code to exit on timeout if new path not found has been added.
* Type of afl_exit_on_time variable has been changed.
Variable exit_on_time has been added to the afl_state_t structure.
* Command `export AFL_EXIT_WHEN_DONE=1` has been added.
* Millisecond to second conversion has been added.
Call get_cur_time() has been added.
* Revert to using the saved current time value.
* Useless check has been removed.
* Adding AFL_KILL_SIGNAL environment variable
Controlling the kill signal used to end forked processes.
* Checking validity of AFL_KILL_SIGNAL env variable
This commit also sets a valid value in the environment to avoid
duplicating code in at_exit(). Changing data type of
fsrv->kill_signal to u8 to match last_kill_signal.
* Adding afl_kill_signal to AFL (environment) state
This commit simply introduces a struct member for future use. The
env variable is not used from the afl struct but from fsrv, where
its validity is checked, resulting in a FATAL in case of errors.
