The addition of child_init_modules() and child_exit_modules() has made child

initialization a critical section.  We can't service a USR1, TERM, or HUP
request during this period because all our data structures could be in
some unknown state.  So block_alarms() the whole way through.

Fix a segfault caused by terminating before allocating pchild.  This won't
occur with the above fix in place, but seems a reasonable precaution should
there be a need to call clean_child_exit() before pchild is allocated.

Fix various cases where exit() was called rather than clean_child_exit().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80207 13f79535-47bb-0310-9956-ffa450edef68