- return __syscall_ret(__clone(func, stack, flags, arg, ptid, tls, ctid));
+ /* If CLONE_VM is used, it's impossible to give the child a consistent
+ * thread structure. In this case, the best we can do is assume the
+ * caller is content with an extremely restrictive execution context
+ * like the one vfork() would provide. */
+ if (flags & CLONE_VM) return __syscall_ret(
+ __clone(func, stack, flags, arg, ptid, tls, ctid));
+
+ __block_all_sigs(&csa.sigmask);
+ LOCK(__abort_lock);
+
+ /* Setup the a wrapper start function for the child process to do
+ * mimic _Fork in producing a consistent execution state. */
+ csa.func = func;
+ csa.arg = arg;
+ int ret = __clone(clone_start, stack, flags, &csa, ptid, tls, ctid);
+
+ __post_Fork(ret);
+ __restore_sigs(&csa.sigmask);
+ return __syscall_ret(ret);