diff --git a/core/libs/prx/libkernel/File/src/Stdio.cpp b/core/libs/prx/libkernel/File/src/Stdio.cpp
index 0bfedc48da..531c800fbf 100644
--- a/core/libs/prx/libkernel/File/src/Stdio.cpp
+++ b/core/libs/prx/libkernel/File/src/Stdio.cpp
@@ -786,6 +786,10 @@ int64_t APS5_VABI fstat_nid_disambig1_nid_postfix(int d, FileStat* sb) {
     return 0;
 }
 
+int64_t APS5_VABI _fstat_nid_postfix(int d, FileStat* sb) {
+    return fstat_nid_disambig1_nid_postfix(d, sb);
+}
+
 int APS5_VABI ftruncate_nid_postfix(int d, int64_t length) {
     if (length < 0 || GuestSockets::IsOpen(d)) {
         return PosixFailure(GUEST_EINVAL);
@@ -1439,4 +1443,12 @@ int64_t APS5_VABI writev_nid_postfix(int d, const KernelIovec* iov, int iovcnt)
     return result < 0 ? PosixFailure(static_cast<int>(result) & 0xffff) : result;
 }
 
+int64_t APS5_VABI _readv_nid_postfix(int d, const KernelIovec* iov, int iovcnt) {
+    return readv_nid_postfix(d, iov, iovcnt);
+}
+
+int64_t APS5_VABI _writev_nid_postfix(int d, const KernelIovec* iov, int iovcnt) {
+    return writev_nid_postfix(d, iov, iovcnt);
+}
+
 }
diff --git a/core/libs/prx/libkernel/Socket/src/Udp.cpp b/core/libs/prx/libkernel/Socket/src/Udp.cpp
index 799c7b8b9b..53983f29ed 100644
--- a/core/libs/prx/libkernel/Socket/src/Udp.cpp
+++ b/core/libs/prx/libkernel/Socket/src/Udp.cpp
@@ -943,6 +943,20 @@ int APS5_VABI fcntl_nid_postfix(int descriptor, int command, ...) {
     socket->options.nonblocking = enabled != 0;
     return 0;
 }
+int APS5_VABI _fcntl_nid_postfix(int descriptor, int command, ...) {
+#ifdef _WIN32
+    __builtin_sysv_va_list arguments;
+    __builtin_sysv_va_start(arguments, command);
+    const auto argument = __builtin_va_arg(arguments, std::uint64_t);
+    __builtin_sysv_va_end(arguments);
+#else
+    std::va_list arguments;
+    va_start(arguments, command);
+    const auto argument = va_arg(arguments, std::uint64_t);
+    va_end(arguments);
+#endif
+    return fcntl_nid_postfix(descriptor, command, argument);
+}
 int APS5_VABI setsockopt_nid_postfix(int descriptor, int level, int option,
                                     const void* value, std::uint32_t length) {
     int netError = 0;
@@ -1003,6 +1017,10 @@ int APS5_VABI socket_nid_postfix(int family, int type, int protocol) {
         return Fail(12);
     }
 }
+int APS5_VABI __sys_socketex_nid_postfix(const char* name, int family, int type, int protocol) {
+    static_cast<void>(name);
+    return socket_nid_postfix(family, type, protocol);
+}
 int APS5_VABI socketpair_nid_postfix(int family, int type, int protocol, int* descriptors) {
     const bool nonblocking = (type & GuestNonBlocking) != 0;
     const int plainType = type & ~(GuestCloseOnExec | GuestNonBlocking);
diff --git a/core/libs/tests/GuestFileTimestamps.cpp b/core/libs/tests/GuestFileTimestamps.cpp
index 13c71a958d..b1e91115f8 100644
--- a/core/libs/tests/GuestFileTimestamps.cpp
+++ b/core/libs/tests/GuestFileTimestamps.cpp
@@ -19,6 +19,7 @@ int APS5_VABI stat_nid_postfix(const char*, FileStat*);
 int APS5_VABI lstat_nid_postfix(const char*, FileStat*);
 int APS5_VABI sceKernelFstat(int, FileStat*);
 std::int64_t APS5_VABI fstat_nid_disambig1_nid_postfix(int, FileStat*);
+std::int64_t APS5_VABI _fstat_nid_postfix(int, FileStat*);
 int APS5_VABI open_nid_postfix(const char*, int, int);
 int APS5_VABI close_nid_postfix(int);
 int APS5_VABI pipe_nid_postfix(int*);
@@ -37,11 +38,12 @@ static bool Same(const KernelTimespec& actual, const KernelTimeval& expected) {
 }
 
 static void CheckTimes(const std::string& path, int fd, const KernelTimeval* expected) {
-    FileStat byPath{}, byFd{}, byKernel{};
+    FileStat byPath{}, byFd{}, byKernel{}, byAlias{};
     Require(stat_nid_postfix(path.c_str(), &byPath) == 0, "stat");
     Require(fstat_nid_disambig1_nid_postfix(fd, &byFd) == 0, "fstat");
     Require(sceKernelFstat(fd, &byKernel) == 0, "sceKernelFstat");
-    for (const auto* status : {&byPath, &byFd, &byKernel}) {
+    Require(_fstat_nid_postfix(fd, &byAlias) == 0, "_fstat");
+    for (const auto* status : {&byPath, &byFd, &byKernel, &byAlias}) {
         Require(Same(status->st_atim, expected[0]), "access time preserves microseconds");
         Require(Same(status->st_mtim, expected[1]), "modification time preserves microseconds");
     }
diff --git a/core/libs/tests/GuestFileVector.cpp b/core/libs/tests/GuestFileVector.cpp
index f864d0e069..e9e7b46880 100644
--- a/core/libs/tests/GuestFileVector.cpp
+++ b/core/libs/tests/GuestFileVector.cpp
@@ -41,6 +41,8 @@ int APS5_VABI sceKernelLseek(int, std::int64_t, int);
 std::int64_t APS5_VABI sceKernelReadv(int, const GuestIovec*, int);
 std::int64_t APS5_VABI readv_nid_postfix(int, const GuestIovec*, int);
 std::int64_t APS5_VABI writev_nid_postfix(int, const GuestIovec*, int);
+std::int64_t APS5_VABI _readv_nid_postfix(int, const GuestIovec*, int);
+std::int64_t APS5_VABI _writev_nid_postfix(int, const GuestIovec*, int);
 int* APS5_VABI __error_nid_postfix();
 std::int64_t APS5_VABI sceKernelWritev(int, const GuestIovec*, int);
 std::int64_t APS5_VABI sceKernelPreadv(int, const GuestIovec*, int, std::int64_t);
@@ -200,6 +202,8 @@ int main() {
     Require(sceKernelLseek(file, 0, 1) == 7);
     Require(readv_nid_postfix(file, reads, 2) == 3);
     Require(readv_nid_postfix(file, reads, 2) == 0);
+    Require(sceKernelLseek(file, 3, 0) == 3 && _readv_nid_postfix(file, reads, 2) == 7);
+    Require(std::memcmp(first, "345", 3) == 0 && std::memcmp(second, "6789", 4) == 0);
     Require(readv_nid_postfix(file, reads, -1) == -1 && *__error_nid_postfix() == 22);
     Require(writev_nid_postfix(file, nullptr, 1) == -1 && *__error_nid_postfix() == 14);
 
@@ -224,6 +228,9 @@ int main() {
     Require(sceKernelLseek(file, 0, 1) == 13 && Contents(path) == "01ABCDE7CDEAB");
     Require(sceKernelLseek(file, 8, 0) == 8 && writev_nid_postfix(file, writes, 2) == 5);
     Require(Contents(path) == "01ABCDE7ABCDE");
+    Require(sceKernelLseek(file, 8, 0) == 8 && _writev_nid_postfix(file, swapped, 2) == 5);
+    Require(sceKernelLseek(file, 0, 1) == 13 && Contents(path) == "01ABCDE7CDEAB");
+    Require(sceKernelLseek(file, 8, 0) == 8 && writev_nid_postfix(file, writes, 2) == 5);
 
     GuestIovec gapped[3] = {{first, 2}, {nullptr, 0}, {second, 3}};
     Require(sceKernelPreadv(file, gapped, 3, 0) == 5);
diff --git a/core/libs/tests/GuestKernelFcntl.cpp b/core/libs/tests/GuestKernelFcntl.cpp
index 912ce45b64..6d555d64eb 100644
--- a/core/libs/tests/GuestKernelFcntl.cpp
+++ b/core/libs/tests/GuestKernelFcntl.cpp
@@ -11,9 +11,11 @@
 #include <thread>
 extern "C" {
 int APS5_VABI socket_nid_postfix(int, int, int);
+int APS5_VABI __sys_socketex_nid_postfix(const char*, int, int, int);
 int APS5_VABI close_nid_postfix(int);
 int APS5_VABI pipe_nid_postfix(int*);
 int APS5_VABI fcntl_nid_postfix(int, int, ...);
+int APS5_VABI _fcntl_nid_postfix(int, int, ...);
 int APS5_VABI ioctl_nid_postfix(int, std::uint64_t, void*);
 std::int64_t APS5_VABI read_nid_postfix(int, void*, std::uint64_t);
 std::int64_t APS5_VABI write_nid_postfix(int, const char*, std::int64_t);
@@ -110,6 +112,8 @@ static void SocketsKeepTheirPath() {
     Require(sceKernelFcntl(socket, GetFlags) == SceEbadf);
     Require(sceKernelFcntl(-1, GetFlags) == SceEbadf);
     Require(sceKernelFcntl(12345, GetFlags) == SceEbadf);
+    const int named = __sys_socketex_nid_postfix("probe", 2, 1, 0);
+    Require(named >= 0 && sceKernelFcntl(named, GetFlags) == ReadWrite && close_nid_postfix(named) == 0);
 }
 
 static void FileFlagsRoundTrip() {
@@ -166,6 +170,10 @@ static void FileFlagsRoundTrip() {
     Require(fcntl_nid_postfix(file, SetLock, &lock) == 0);
     GuestLock probe{0, 0, 0, 1, 0, 0};
     Require(fcntl_nid_postfix(file, GetLock, &probe) == 0 && probe.type == 2);
+    static GuestLock imageProbe{0, 0, 0, 1, 0, 0};
+    Require(_fcntl_nid_postfix(file, GetLock, &imageProbe) == 0 && imageProbe.type == 2);
+    Require(_fcntl_nid_postfix(file, SetDescriptorFlags, 1) == 0 && _fcntl_nid_postfix(file, GetDescriptorFlags) == 1);
+    Require(_fcntl_nid_postfix(file, SetDescriptorFlags, 0) == 0);
     lock.type = 2;
     Require(fcntl_nid_postfix(file, SetLock, &lock) == 0);
     lock.type = 7;