Hi Chen,
On Mon, Feb 03, 2025 at 11:30:05PM +0800, Chen Linxuan wrote:
> ---
> man/man2/clone.2 | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/man/man2/clone.2 b/man/man2/clone.2
> index 3ffe8e7b8..cd63fe0b1 100644
> --- a/man/man2/clone.2
> +++ b/man/man2/clone.2
> @@ -1891,6 +1891,7 @@ main(int argc, char *argv[])
> char *stackTop; /* End of stack buffer */
> pid_t pid;
> struct utsname uts;
> + int savedErrno;
> \&
> if (argc < 2) {
> fprintf(stderr, "Usage: %s <child\-hostname>\[rs]n", argv[0]);
> @@ -1910,8 +1911,18 @@ main(int argc, char *argv[])
> child commences execution in childFunc(). */
> \&
> pid = clone(childFunc, stackTop, CLONE_NEWUTS | SIGCHLD, argv[1]);
> - if (pid == \-1)
> +\&
> + /* Free child stack, as it is not used by the parent. */
> +\&
> + savedErrno = errno;
> + if (munmap(stack, STACK_SIZE)) {
> + warn("munmap");
> + }
> + errno = savedErrno;
> +\&
> + if (pid == \-1) {
> err(EXIT_FAILURE, "clone");
> + }
This is too complex for an example program. A goto alternative might be
easier.
Cheers,
Alex
> printf("clone() returned %jd\[rs]n", (intmax_t) pid);
> \&
> /* Parent falls through to here */
> --
> 2.43.0
>
--
<https://www.alejandro-colomar.es/>
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