[LTP] [PATCH] poll: fix LTP check warnings and improve poll01 validation

[Jinseok Kim]

Remove extra blank lines, mark helper functions as static, and fix
documentation comments starting with '/*\'.

Add explicit checks for poll() return value and validate that no
unexpected revents bits are set for POLLIN and POLLOUT cases.

Signed-off-by: Jinseok Kim <always.starving0@gmail.com>
---
 testcases/kernel/syscalls/poll/poll01.c | 24 ++++++++++++++++++------
 testcases/kernel/syscalls/poll/poll02.c |  4 ++--
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/testcases/kernel/syscalls/poll/poll01.c b/testcases/kernel/syscalls/poll/poll01.c
index b05e809ab..ca68ec9c4 100644
--- a/testcases/kernel/syscalls/poll/poll01.c
+++ b/testcases/kernel/syscalls/poll/poll01.c
@@ -5,7 +5,7 @@
  * Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
  */

-/*
+/*\
  * Check that poll() works for POLLOUT and POLLIN and that revents is set
  * correctly.
  */
@@ -34,11 +34,14 @@ static void verify_pollout(void)
 		return;
 	}

-	if (outfds[0].revents != POLLOUT) {
-		tst_res(TFAIL | TTERRNO, "poll() failed to set POLLOUT");
+	if (TST_RET != 1) {
+		tst_res(TFAIL, "Unexpected poll() return value %ld in POLLOUT", TST_RET);
 		return;
 	}

+	TST_EXP_EXPR(outfds[0].revents & POLLOUT);
+	TST_EXP_EXPR((outfds[0].revents & ~POLLOUT) == 0);
+
 	tst_res(TPASS, "poll() POLLOUT");
 }

@@ -60,11 +63,20 @@ static void verify_pollin(void)
 		goto end;
 	}

-	if (infds[0].revents != POLLIN) {
-		tst_res(TFAIL, "poll() failed to set POLLIN");
+	if (TST_RET != 1) {
+		tst_res(TFAIL, "Unexpected poll() return value %ld in POLLIN", TST_RET);
 		goto end;
 	}

+	if (!(infds[0].revents & POLLIN)) {
+		tst_res(TFAIL, "infds[0].revents & POLLIN");
+		goto end;
+	}
+
+	if (!((infds[0].revents & ~POLLIN) == 0)) {
+		tst_res(TFAIL, "infds[0].revents & ~POLLIN) == 0");
+		goto end;
+	}

 	tst_res(TPASS, "poll() POLLIN");

@@ -72,7 +84,7 @@ end:
 	SAFE_READ(1, fildes[0], read_buf, sizeof(write_buf));
 }

-void verify_poll(unsigned int n)
+static void verify_poll(unsigned int n)
 {
 	switch (n) {
 	case 0:
diff --git a/testcases/kernel/syscalls/poll/poll02.c b/testcases/kernel/syscalls/poll/poll02.c
index c0665927b..47e323451 100644
--- a/testcases/kernel/syscalls/poll/poll02.c
+++ b/testcases/kernel/syscalls/poll/poll02.c
@@ -3,7 +3,7 @@
  * Copyright (C) 2015-2017 Cyril Hrubis <chrubis@suse.cz>
  */

-/*
+/*\
  * Check that poll() timeouts correctly.
  */
 #include <errno.h>
@@ -15,7 +15,7 @@

 static int fds[2];

-int sample_fn(int clk_id, long long usec)
+static int sample_fn(int clk_id, long long usec)
 {
 	unsigned int sleep_ms = usec / 1000;

--
2.43.0