7 files changed, 13 insertions, 11 deletions
diff --git a/test/syscalls/linux/exec.cc b/test/syscalls/linux/exec.cc
index 07bd527e6..12c9b05ca 100644
--- a/test/syscalls/linux/exec.cc
+++ b/test/syscalls/linux/exec.cc
@@ -812,26 +812,28 @@ void ExecFromThread() {
 bool ValidateProcCmdlineVsArgv(const int argc, const char* const* argv) {
   auto contents_or = GetContents("/proc/self/cmdline");
   if (!contents_or.ok()) {
-    std::cerr << "Unable to get /proc/self/cmdline: " << contents_or.error();
+    std::cerr << "Unable to get /proc/self/cmdline: " << contents_or.error()
+              << std::endl;
     return false;
   }
   auto contents = contents_or.ValueOrDie();
   if (contents.back() != '\0') {
-    std::cerr << "Non-null terminated /proc/self/cmdline!";
+    std::cerr << "Non-null terminated /proc/self/cmdline!" << std::endl;
     return false;
   }
   contents.pop_back();
   std::vector<std::string> procfs_cmdline = absl::StrSplit(contents, '\0');
 
   if (static_cast<int>(procfs_cmdline.size()) != argc) {
-    std::cerr << "argc = " << argc << " != " << procfs_cmdline.size();
+    std::cerr << "argc = " << argc << " != " << procfs_cmdline.size()
+              << std::endl;
     return false;
   }
 
   for (int i = 0; i < argc; ++i) {
     if (procfs_cmdline[i] != argv[i]) {
       std::cerr << "Procfs command line argument " << i << " mismatch "
-                << procfs_cmdline[i] << " != " << argv[i];
+                << procfs_cmdline[i] << " != " << argv[i] << std::endl;
       return false;
     }
   }
diff --git a/test/syscalls/linux/poll.cc b/test/syscalls/linux/poll.cc
index c42472474..1e35a4a8b 100644
--- a/test/syscalls/linux/poll.cc
+++ b/test/syscalls/linux/poll.cc
@@ -266,7 +266,7 @@ TEST_F(PollTest, Nfds) {
   }
 
   rlim_t max_fds = rlim.rlim_cur;
-  std::cout << "Using limit: " << max_fds;
+  std::cout << "Using limit: " << max_fds << std::endl;
 
   // Create an eventfd. Since its value is initially zero, it is writable.
   FileDescriptor efd = ASSERT_NO_ERRNO_AND_VALUE(NewEventFD());
diff --git a/test/syscalls/linux/proc_pid_smaps.cc b/test/syscalls/linux/proc_pid_smaps.cc
index 7f2e8f203..9fb1b3a2c 100644
--- a/test/syscalls/linux/proc_pid_smaps.cc
+++ b/test/syscalls/linux/proc_pid_smaps.cc
@@ -173,7 +173,7 @@ PosixErrorOr<std::vector<ProcPidSmapsEntry>> ParseProcPidSmaps(
       return;
     }
     unknown_fields.insert(std::string(key));
-    std::cerr << "skipping unknown smaps field " << key;
+    std::cerr << "skipping unknown smaps field " << key << std::endl;
   };
 
   auto lines = absl::StrSplit(contents, '\n', absl::SkipEmpty());
@@ -191,7 +191,7 @@ PosixErrorOr<std::vector<ProcPidSmapsEntry>> ParseProcPidSmaps(
     // amount of whitespace).
     if (!entry) {
       std::cerr << "smaps line not considered a maps line: "
-                << maybe_maps_entry.error_message();
+                << maybe_maps_entry.error_message() << std::endl;
       return PosixError(
           EINVAL,
           absl::StrCat("smaps field line without preceding maps line: ", l));
diff --git a/test/syscalls/linux/ptrace.cc b/test/syscalls/linux/ptrace.cc
index bfe3e2603..cb828ff88 100644
--- a/test/syscalls/linux/ptrace.cc
+++ b/test/syscalls/linux/ptrace.cc
@@ -1188,7 +1188,7 @@ TEST(PtraceTest, SeizeSetOptions) {
     // gVisor is not susceptible to this race because
     // kernel.Task.waitCollectTraceeStopLocked() checks specifically for an
     // active ptraceStop, which is not initiated if SIGKILL is pending.
-    std::cout << "Observed syscall-exit after SIGKILL";
+    std::cout << "Observed syscall-exit after SIGKILL" << std::endl;
     ASSERT_THAT(waitpid(child_pid, &status, 0),
                 SyscallSucceedsWithValue(child_pid));
   }
diff --git a/test/syscalls/linux/sendfile_socket.cc b/test/syscalls/linux/sendfile_socket.cc
index 8f7ee4163..e94672679 100644
--- a/test/syscalls/linux/sendfile_socket.cc
+++ b/test/syscalls/linux/sendfile_socket.cc
@@ -149,7 +149,7 @@ TEST_P(SendFileTest, SendMultiple) {
   for (size_t sent = 0; sent < data.size(); cnt++) {
     const size_t remain = data.size() - sent;
     std::cout << "sendfile, size=" << data.size() << ", sent=" << sent
-              << ", remain=" << remain;
+              << ", remain=" << remain << std::endl;
 
     // Send data and verify that sendfile returns the correct value.
     int res = sendfile(client.get(), inf.get(), nullptr, remain);
diff --git a/test/syscalls/linux/socket_inet_loopback.cc b/test/syscalls/linux/socket_inet_loopback.cc
index 2ffc86382..1b34e4ef7 100644
--- a/test/syscalls/linux/socket_inet_loopback.cc
+++ b/test/syscalls/linux/socket_inet_loopback.cc
@@ -2212,7 +2212,7 @@ TEST_P(SocketMultiProtocolInetLoopbackTest, PortReuseTwoSockets) {
           setsockopt(fd2, SOL_SOCKET, SO_REUSEPORT, &portreuse2, sizeof(int)),
           SyscallSucceeds());
 
-      std::cout << portreuse1 << " " << portreuse2;
+      std::cout << portreuse1 << " " << portreuse2 << std::endl;
       int ret = bind(fd2, reinterpret_cast<sockaddr*>(&addr), addrlen);
 
       // Verify that two sockets can be bound to the same port only if
diff --git a/test/syscalls/linux/socket_netlink_route.cc b/test/syscalls/linux/socket_netlink_route.cc
index e5aed1eec..2efb96bc3 100644
--- a/test/syscalls/linux/socket_netlink_route.cc
+++ b/test/syscalls/linux/socket_netlink_route.cc
@@ -152,7 +152,7 @@ TEST(NetlinkRouteTest, GetLinkDump) {
     const struct ifinfomsg* msg =
         reinterpret_cast<const struct ifinfomsg*>(NLMSG_DATA(hdr));
     std::cout << "Found interface idx=" << msg->ifi_index
-              << ", type=" << std::hex << msg->ifi_type;
+              << ", type=" << std::hex << msg->ifi_type << std::endl;
     if (msg->ifi_type == ARPHRD_LOOPBACK) {
       loopbackFound = true;
       EXPECT_NE(msg->ifi_flags & IFF_LOOPBACK, 0);