* process.c: don't use non async-signal-safe functions in a child

  process before exec, for invoking a command.
  (rb_exec_atfork): call rb_exec_async_signal_safe only.
  (retry_fork): take chfunc_is_async_signal_safe argument.  call
  before_fork and after_fork only unless chfunc_is_async_signal_safe.
  (send_child_error): take chfunc_is_async_signal_safe argument.
  send an exception only unless chfunc_is_async_signal_safe.
  (recv_child_error): take chfunc_is_async_signal_safe argument.
  receive an exception only unless chfunc_is_async_signal_safe.
  (rb_fork_internal): renamed from rb_fork_err and take
  chfunc_is_async_signal_safe argument.
  use rb_protect only unless chfunc_is_async_signal_safe.
  (rb_fork_err): call rb_fork_internal with false as
  chfunc_is_async_signal_safe.
  (rb_fork_async_signal_safe): call rb_fork_internal with true as
  chfunc_is_async_signal_safe.
  (rb_spawn_process): call rb_fork_async_signal_safe instead of
  rb_fork_err.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35991 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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