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From:   Yuan Tan <tanyuan@tinylab.org>
To:     w@1wt.eu
Cc:     falcon@tinylab.org, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org, Yuan Tan <tanyuan@tinylab.org>
Subject: [PATCH 2/2] selftests/nolibc: add testcase for pipe.
Date:   Tue, 25 Jul 2023 14:01:30 -0400
Message-Id: <160ddef0313e11085ee906144d6d9678b8156171.1690307717.git.tanyuan@tinylab.org>
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Add a testcase of pipe that child process sends message to parent process.

Signed-off-by: Yuan Tan <tanyuan@tinylab.org>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 34 ++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 03b1d30f5507..43ba2884fd1e 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -767,6 +767,39 @@ int test_mmap_munmap(void)
 	return ret;
 }
 
+int test_pipe(void)
+{
+	int pipefd[2];
+	char buf[32];
+	pid_t pid;
+	char *msg = "hello, nolibc";
+
+	if (pipe(pipefd) == -1)
+		return 1;
+
+	pid = fork();
+
+	switch (pid) {
+	case -1:
+		return 1;
+
+	case 0:
+		close(pipefd[0]);
+		write(pipefd[1], msg, strlen(msg));
+		close(pipefd[1]);
+		exit(EXIT_SUCCESS);
+
+	default:
+		close(pipefd[1]);
+		read(pipefd[0], buf, 32);
+		close(pipefd[0]);
+		wait(NULL);
+
+		if (strcmp(buf, msg))
+			return 1;
+		return 0;
+	}
+}
 
 /* Run syscall tests between IDs <min> and <max>.
  * Return 0 on success, non-zero on failure.
@@ -851,6 +884,7 @@ int run_syscall(int min, int max)
 		CASE_TEST(mmap_munmap_good);  EXPECT_SYSZR(1, test_mmap_munmap()); break;
 		CASE_TEST(open_tty);          EXPECT_SYSNE(1, tmp = open("/dev/null", 0), -1); if (tmp != -1) close(tmp); break;
 		CASE_TEST(open_blah);         EXPECT_SYSER(1, tmp = open("/proc/self/blah", 0), -1, ENOENT); if (tmp != -1) close(tmp); break;
+		CASE_TEST(pipe);              EXPECT_SYSZR(1, test_pipe()); break;
 		CASE_TEST(poll_null);         EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;
 		CASE_TEST(poll_stdout);       EXPECT_SYSNE(1, ({ struct pollfd fds = { 1, POLLOUT, 0}; poll(&fds, 1, 0); }), -1); break;
 		CASE_TEST(poll_fault);        EXPECT_SYSER(1, poll((void *)1, 1, 0), -1, EFAULT); break;
-- 
2.39.2