[PATCH stalld 15/36] tests/helpers: Flush stdout after starvation_gen startup messages

[Wander Lairson Costa <wander@redhat.com>]

starvation_gen prints its startup configuration (iteration target and
stop instructions) via printf, but does not flush stdout afterward.
When stdout is not connected to a terminal, libc switches to block
buffering, so these messages may not reach the test harness until the
buffer fills or the process exits.

Add an explicit fflush(stdout) after the startup printf calls to
ensure immediate delivery regardless of buffering mode.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
---
 tests/helpers/starvation_gen.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/helpers/starvation_gen.c b/tests/helpers/starvation_gen.c
index dc0e3de..81ee714 100644
--- a/tests/helpers/starvation_gen.c
+++ b/tests/helpers/starvation_gen.c
@@ -345,6 +345,7 @@ int main(int argc, char **argv) {
 	}
 	printf("\nBlockees will complete if boosted enough to finish %lu iterations\n", cfg.work_target);
 	printf("Press Ctrl+C to stop early\n");
+	fflush(stdout);
 
 	/*
 	 * Wait for specified duration OR until all blockees complete (whichever comes first).
-- 
2.53.0