From da4085786b76598d279996c8e6ee87d3fa6a8da1 Mon Sep 17 00:00:00 2001
From: Amit Shah <amit.shah@redhat.com>
Date: Tue, 28 Sep 2010 16:51:53 +0530
Subject: auto-test: Add test for lseek()

lseek() on console ports should fail with -ESPIPE.

(This behaviour will be seen from kernel 2.6.37 onwards.  Older kernels
just returned success without seeking.)

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 auto-virtserial-guest.c | 14 ++++++++++++++
 auto-virtserial.c       | 34 ++++++++++++++++++++++++++++++++++
 virtserial.h            |  1 +
 3 files changed, 49 insertions(+)

diff --git a/auto-virtserial-guest.c b/auto-virtserial-guest.c
index 85d5758..9ceda19 100644
--- a/auto-virtserial-guest.c
+++ b/auto-virtserial-guest.c
@@ -252,6 +252,17 @@ static int close_port(int nr)
 	return ret;
 }
 
+static int seek_port(int nr)
+{
+	int ret;
+
+	ret = lseek(g_open_fds[nr], 20, SEEK_SET);
+	if (ret < 0)
+		ret = -errno;
+
+	return ret;
+}
+
 static int set_port_nonblocking(int val)
 {
 	int ret, flags;
@@ -716,6 +727,9 @@ back_to_open:
 		case KEY_SHUTDOWN:
 			system("shutdown -h now");
 			break;
+		case KEY_LSEEK:
+			ret = seek_port(gpkt.value);
+			send_report(cfd, ret);
 		default:
 			send_report(cfd, -ERANGE);
 			break;
diff --git a/auto-virtserial.c b/auto-virtserial.c
index d11dd28..fb3f40f 100644
--- a/auto-virtserial.c
+++ b/auto-virtserial.c
@@ -232,6 +232,15 @@ static int guest_poll(int nr, int events, int timeout)
 	return guest_cmd(&gpkt);
 }
 
+static int guest_lseek(int nr)
+{
+	struct guest_packet gpkt;
+
+	gpkt.key = KEY_LSEEK;
+	gpkt.value = nr;
+	return guest_cmd(&gpkt);
+}
+
 static int guest_set_port_nonblocking(int nr, int value)
 {
 	struct guest_packet gpkt;
@@ -662,6 +671,24 @@ out:
 	return err;
 }
 
+/* lseek in guest - -ESPIPE is the desired result. */
+static int test_lseek(int nr)
+{
+	int err, ret;
+
+	ret = guest_open_port(nr);
+	err = result(__func__, true, "open", ret, -1, -1, OP_GT, false);
+	if (err)
+		return err;
+
+	ret = guest_lseek(nr);
+	err = result(__func__, true, "lseek",
+		     ret, -ESPIPE, -ESPIPE, OP_EQ, true);
+
+	guest_close_port(nr);
+	return err;
+}
+
 /*
  * Tests if writes to guest get throttled after sending 1M data
  * The invert parameter specifies the test should pass for ports
@@ -1398,6 +1425,7 @@ enum {
 	TEST_BLOCKING_WRITE,
 	TEST_NONBLOCK_WRITE,
 	TEST_POLL,
+	TEST_LSEEK,
 	TEST_G_THROTTLE,
 	TEST_H_THROTTLE,
 	TEST_G_CACHING,
@@ -1455,6 +1483,10 @@ static struct test_parameters {
 		.test_function = test_poll,
 		.needs_guestok = true,
 	},
+	{
+		.test_function = test_lseek,
+		.needs_guestok = true,
+	},
 	{
 		.test_function = test_guest_throttle,
 		.needs_guestok = true,
@@ -1582,6 +1614,8 @@ static int start_tests(void)
 
 	run_test(TEST_POLL, 2);
 
+	run_test(TEST_LSEEK, 2);
+
 #if 0
 	/*
 	 * Guest throttling isn't needed anymore after design changes
diff --git a/virtserial.h b/virtserial.h
index 45c06ad..984ae15 100644
--- a/virtserial.h
+++ b/virtserial.h
@@ -21,6 +21,7 @@
 #define KEY_GET_SIGIO_RESULT	21
 #define KEY_POLL_EVENTS		22
 #define KEY_SHUTDOWN		23
+#define KEY_LSEEK		24
 
 #define HOST_BIG_FILE "/tmp/amit/host-big-file"
 #define GUEST_BIG_FILE "/tmp/amit/guest-big-file"
-- 
cgit