[LTP] [PATCH v3 1/2] splice02: Generate input in C

[Cyril Hrubis <chrubis@suse.cz>]

Hi!
> ---
> changes v2->v3:
> * fix bugs found by Cyril (use !num_writes, !SAFE_FORK(), break if !TST_RET)
> 
> BTW I'm still not sure if break on !TST_RET is needed, but it does not
> harm. If you really like it, I can use while (!TST_RET).

I meant that we could simplify the test with:

diff --git a/testcases/kernel/syscalls/splice/splice02.c b/testcases/kernel/syscalls/splice/splice02.c
index fd71f2995..1b566a2f4 100644
--- a/testcases/kernel/syscalls/splice/splice02.c
+++ b/testcases/kernel/syscalls/splice/splice02.c
@@ -54,18 +54,13 @@ static void do_child(void)
 
 	fd = SAFE_OPEN(TEST_FILENAME, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 
-	while (to_write > 0) {
+	do {
 		TEST(splice(STDIN_FILENO, NULL, fd, NULL, WRITE_SIZE, 0));
-		tst_res(TINFO, "splice() wrote %ld, remaining %d", TST_RET, to_write);
 		if (TST_RET < 0) {
 			tst_res(TFAIL | TTERRNO, "splice failed");
 			goto cleanup;
-		} else if (!TST_RET) {
-			break;
-		} else {
-			to_write -= TST_RET;
 		}
-	}
+	} while (TST_RET > 0);
 
 	stat(TEST_FILENAME, &st);
 	if (st.st_size != num_writes) {
@@ -100,10 +95,10 @@ static void run(void)
 	for (i = 0; i < num_writes; i++)
 		SAFE_WRITE(1, pipe_fd[1], "x", 1);
 
-	tst_reap_children();
-
 	SAFE_CLOSE(pipe_fd[0]);
 	SAFE_CLOSE(pipe_fd[1]);
+
+	tst_reap_children();
 }
 
 static struct tst_test test = {


If you close the pipe in the parent before reaping children the last
splice() will return 0 and exit the loop. No need to count anything.

-- 
Cyril Hrubis
chrubis@suse.cz