[LTP] [PATCH] tst_clone: Fix child detection on sparc

[Anders Roxell <anders.roxell@linaro.org>]

On sparc the clone syscall does not return 0 in the child. It returns
the parent pid, so the child thinks it is the parent.

Save the pid before the clone and compare it after.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
---
 lib/tst_clone.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/tst_clone.c b/lib/tst_clone.c
index 296cd40ac0a0..2fdd9e163717 100644
--- a/lib/tst_clone.c
+++ b/lib/tst_clone.c
@@ -20,6 +20,9 @@ pid_t tst_clone(const struct tst_clone_args *tst_args)
 	};
 	int flags;
 	pid_t pid = -1;
+#ifdef __sparc__
+	pid_t parent_pid = getpid();
+#endif
 
 	tst_flush();
 
@@ -31,7 +34,7 @@ pid_t tst_clone(const struct tst_clone_args *tst_args)
 		return -1;
 
 	if (pid != -1)
-		return pid;
+		goto out;
 
 	flags = args.exit_signal | args.flags;
 
@@ -44,5 +47,11 @@ pid_t tst_clone(const struct tst_clone_args *tst_args)
 	if (pid == -1)
 		return -2;
 
+out:
+#ifdef __sparc__
+	if (getpid() != parent_pid)
+		pid = 0;
+#endif
+
 	return pid;
 }
-- 
2.53.0


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