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diff --git a/lib/libc/stdlib/exit.3 b/lib/libc/stdlib/exit.3
--- a/lib/libc/stdlib/exit.3
+++ b/lib/libc/stdlib/exit.3
@@ -32,7 +32,7 @@
.\" @(#)exit.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
-.Dd March 22, 2020
+.Dd August 5, 2021
.Dt EXIT 3
.Os
.Sh NAME
@@ -76,6 +76,13 @@
function terminates without calling the functions registered with the
.Xr atexit 3
function, and may or may not perform the other actions listed.
+The
+.Fx
+implementation of the
+.Fn _Exit
+function does not flush buffers, does not close streams,
+and does not unlink temporal files.
+.Pp
Both functions make the low-order eight bits of the
.Fa status
argument available to a parent process which has called a
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 +172,27 @@
{
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 at least.
+ */
+ 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;

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