[PATCH v2 3/4] syscalls: accept: Add tst_fd test

[Cyril Hrubis <chrubis@xxxxxxx>]

It looks like we return wrong errno on O_PATH file and open_tree() file descriptors.

Signed-off-by: Cyril Hrubis <chrubis@xxxxxxx>
---
 runtest/syscalls                            |  1 +
 testcases/kernel/syscalls/accept/.gitignore |  1 +
 testcases/kernel/syscalls/accept/accept01.c |  8 ----
 testcases/kernel/syscalls/accept/accept03.c | 47 +++++++++++++++++++++
 4 files changed, 49 insertions(+), 8 deletions(-)
 create mode 100644 testcases/kernel/syscalls/accept/accept03.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 53e519639..55396aad8 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -3,6 +3,7 @@ abort01 abort01
 
 accept01 accept01
 accept02 accept02
+accept03 accept03
 
 accept4_01 accept4_01
 
diff --git a/testcases/kernel/syscalls/accept/.gitignore b/testcases/kernel/syscalls/accept/.gitignore
index 5b1462699..f81d4bec9 100644
--- a/testcases/kernel/syscalls/accept/.gitignore
+++ b/testcases/kernel/syscalls/accept/.gitignore
@@ -1,2 +1,3 @@
 /accept01
 /accept02
+/accept03
diff --git a/testcases/kernel/syscalls/accept/accept01.c b/testcases/kernel/syscalls/accept/accept01.c
index 85af0f8af..e5db1dfec 100644
--- a/testcases/kernel/syscalls/accept/accept01.c
+++ b/testcases/kernel/syscalls/accept/accept01.c
@@ -26,7 +26,6 @@
 struct sockaddr_in sin0, sin1, fsin1;
 
 int invalid_socketfd = 400; /* anything that is not an open file */
-int devnull_fd;
 int socket_fd;
 int udp_fd;
 
@@ -45,10 +44,6 @@ static struct test_case {
 		(struct sockaddr *)&fsin1, sizeof(fsin1), EBADF,
 		"bad file descriptor"
 	},
-	{
-		PF_INET, SOCK_STREAM, 0, &devnull_fd, (struct sockaddr *)&fsin1,
-		sizeof(fsin1), ENOTSOCK, "fd is not socket"
-	},
 	{
 		PF_INET, SOCK_STREAM, 0, &socket_fd, (struct sockaddr *)3,
 		sizeof(fsin1), EINVAL, "invalid socket buffer"
@@ -73,8 +68,6 @@ static void test_setup(void)
 	sin0.sin_port = 0;
 	sin0.sin_addr.s_addr = INADDR_ANY;
 
-	devnull_fd = SAFE_OPEN("/dev/null", O_WRONLY);
-
 	socket_fd = SAFE_SOCKET(PF_INET, SOCK_STREAM, 0);
 	SAFE_BIND(socket_fd, (struct sockaddr *)&sin0, sizeof(sin0));
 
@@ -88,7 +81,6 @@ static void test_setup(void)
 
 static void test_cleanup(void)
 {
-	SAFE_CLOSE(devnull_fd);
 	SAFE_CLOSE(socket_fd);
 	SAFE_CLOSE(udp_fd);
 }
diff --git a/testcases/kernel/syscalls/accept/accept03.c b/testcases/kernel/syscalls/accept/accept03.c
new file mode 100644
index 000000000..084bedaf4
--- /dev/null
+++ b/testcases/kernel/syscalls/accept/accept03.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/*
+ * Copyright (C) 2023 Cyril Hrubis <chrubis@xxxxxxx>
+ */
+
+/*\
+ * [Description]
+ *
+ * Verify that accept() returns ENOTSOCK for non-socket file descriptors.
+ */
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include "tst_test.h"
+
+void check_accept(struct tst_fd *fd)
+{
+	struct sockaddr_in addr = {
+		.sin_family = AF_INET,
+		.sin_port = 0,
+		.sin_addr = {.s_addr = INADDR_ANY},
+	};
+	socklen_t size = sizeof(addr);
+
+	switch (fd->type) {
+	case TST_FD_UNIX_SOCK:
+	case TST_FD_INET_SOCK:
+		return;
+	default:
+		break;
+	}
+
+	TST_EXP_FAIL2(accept(fd->fd, (void*)&addr, &size),
+		ENOTSOCK, "accept() on %s", tst_fd_desc(fd));
+}
+
+static void verify_accept(void)
+{
+	TST_FD_FOREACH(fd)
+		check_accept(&fd);
+}
+
+static struct tst_test test = {
+	.test_all = verify_accept,
+};
-- 
2.41.0