From dc008fbbccf69deba55fd7649424bc568f766596 Mon Sep 17 00:00:00 2001
From: Andrei Vagin <avagin@google.com>
Date: Thu, 27 Aug 2020 16:50:11 -0700
Subject: unix: return ECONNREFUSE if a socket file exists but a socket isn't
 bound to it

PiperOrigin-RevId: 328843560
---
 test/syscalls/linux/mknod.cc | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'test')

diff --git a/test/syscalls/linux/mknod.cc b/test/syscalls/linux/mknod.cc
index 05dfb375a..2ba8c11b8 100644
--- a/test/syscalls/linux/mknod.cc
+++ b/test/syscalls/linux/mknod.cc
@@ -14,6 +14,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/un.h>
@@ -103,6 +104,24 @@ TEST(MknodTest, UnimplementedTypesReturnError) {
   ASSERT_THAT(mknod(path.c_str(), S_IFBLK, 0), SyscallFailsWithErrno(EPERM));
 }
 
+TEST(MknodTest, Socket) {
+  ASSERT_THAT(chdir(GetAbsoluteTestTmpdir().c_str()), SyscallSucceeds());
+
+  SKIP_IF(IsRunningOnGvisor() && IsRunningWithVFS1());
+
+  ASSERT_THAT(mknod("./file0", S_IFSOCK | S_IRUSR | S_IWUSR, 0),
+              SyscallSucceeds());
+
+  int sk;
+  ASSERT_THAT(sk = socket(AF_UNIX, SOCK_SEQPACKET, 0), SyscallSucceeds());
+  FileDescriptor fd(sk);
+
+  struct sockaddr_un addr = {.sun_family = AF_UNIX};
+  absl::SNPrintF(addr.sun_path, sizeof(addr.sun_path), "./file0");
+  ASSERT_THAT(connect(sk, (struct sockaddr *)&addr, sizeof(addr)),
+              SyscallFailsWithErrno(ECONNREFUSED));
+}
+
 TEST(MknodTest, Fifo) {
   const std::string fifo = NewTempAbsPath();
   ASSERT_THAT(mknod(fifo.c_str(), S_IFIFO | S_IRUSR | S_IWUSR, 0),
-- 
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