D31425.id.diff
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	diff --git a/lib/libc/sys/fork.2 b/lib/libc/sys/fork.2
	--- a/lib/libc/sys/fork.2
	+++ b/lib/libc/sys/fork.2
	@@ -28,7 +28,7 @@
	.\" @(#)fork.2 8.1 (Berkeley) 6/4/93
	.\" $FreeBSD$
	.\"
	-.Dd August 2, 2021
	+.Dd August 5, 2021
	.Dt FORK 2
	.Os
	.Sh NAME
	@@ -172,11 +172,28 @@
	{
	pid_t pid;

	+ /*
	+ * If child is expected to use stdio(3), state of
	+ * the reused io streams must be synchronized between
	+ * parent and child, to avoid double output and other
	+ * possible issues.
	+ */
	+ fflush(stdout);
	+
	switch (pid = fork()) {
	case -1:
	err(1, "Failed to fork");
	case 0:
	printf("Hello from child process!\en");
	+
	+ /*
	+ * Since we wrote into stdout, child needs to use
	+ * exit(3) and not _exit(2). This causes handlers
	+ * registered with atexit(3) to be called twice,
	+ * once in parent, and once in the child. If such
	+ * behavior is undesirable, consider
	+ * terminating child with _exit(2) or _Exit(3).
	+ */
	exit(0);
	default:
	break;