[LTP] tst_clone: Fix child detection on sparc

[linuxtestproject.agent@gmail.com]

Hi Anders,

On Mon Sep 28 23:27:13 2026 +0200, Anders Roxell <anders.roxell@linaro.org> wrote:
> tst_clone: Fix child detection on sparc

> +#ifdef __sparc__
> +	pid_t parent_pid = getpid();
> +#endif

Use tst_getpid() instead of getpid(). glibc versions prior to 2.25 cache
getpid(), which returns a stale PID if tst_clone() is called from a child
process created by a direct clone syscall.

> +out:
> +#ifdef __sparc__
> +	if (getpid() != parent_pid)
> +		pid = 0;
> +#endif

Calling getpid() in the child returns the cached parent PID on glibc < 2.25
because the raw clone syscall bypasses glibc, causing child detection to fail.
Use if (pid == parent_pid) pid = 0; instead, or use tst_getpid().

Verdict - Needs revision

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