[PATCH] man/man2/clone.2: Use munmap() to free child stack

[Chen Linxuan <chenlinxuan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

While reading the help manual for clone.2, I notice that the parent
process in the example code does not release the stack of the child
process.

This is not a problem for the example program, but it is somewhat
misleading.

Signed-off-by: Chen Linxuan <chenlinxuan@xxxxxxxxxxxxx>
---
 man/man2/clone.2 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/man/man2/clone.2 b/man/man2/clone.2
index 3ffe8e7b8..5e6b2ef1f 100644
--- a/man/man2/clone.2
+++ b/man/man2/clone.2
@@ -1910,6 +1910,8 @@ main(int argc, char *argv[])
        child commences execution in childFunc(). */
 \&
     pid = clone(childFunc, stackTop, CLONE_NEWUTS | SIGCHLD, argv[1]);
+    if (munmap(stack, STACK_SIZE))
+        err(EXIT_FAILURE, "munmap");
     if (pid == \-1)
         err(EXIT_FAILURE, "clone");
     printf("clone() returned %jd\[rs]n", (intmax_t) pid);
-- 
2.43.0