Include info about system call errors in some exceptions from operating on named mutexes

src/coreclr/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshal.CoreCLR.cs

@@ -206,6 +206,29 @@ private static unsafe void WriteValueSlow<T>(object ptr, int ofs, T val, Action<
         [MethodImpl(MethodImplOptions.InternalCall)]
         public static extern void SetLastPInvokeError(int error);
 
+        /// <summary>
+        /// Begins tracking system call errors on the calling thread during PAL APIs. The system call errors may include
+        /// information about the system call made, relevant arguments, return values, and error codes. A call to this method
+        /// should be followed by a call to <see cref="EndTrackingSystemCallErrors"/> on the same thread, which returns the set
+        /// of system call errors that occurred on the thread in that period. Only system call errors that lead to PAL API
+        /// failures may be tracked.
+        /// </summary>
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        internal static extern void BeginTrackingSystemCallErrors();
+
+        /// <summary>
+        /// Retrieves system call errors that occurred on the calling thread since <see cref="BeginTrackingSystemCallErrors"/>
+        /// was called.
+        /// </summary>
+        /// <param name="getSystemCallErrors">Indicates whether to return the accumulated system call errors.</param>
+        /// <returns>
+        /// System call errors that occurred on the calling thread since <see cref="BeginTrackingSystemCallErrors"/> was called.
+        /// Returns <code>null</code> if <see cref="BeginTrackingSystemCallErrors"/> has not been called, or if no system call
+        /// errors occurred on the calling thread since it was last called.
+        /// </returns>
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        internal static extern string EndTrackingSystemCallErrors(bool getSystemCallErrors);
+
         private static void PrelinkCore(MethodInfo m)
         {
             if (!(m is RuntimeMethodInfo rmi))

src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshal.NativeAot.cs

@@ -210,6 +210,27 @@ public static void SetLastPInvokeError(int error)
             PInvokeMarshal.t_lastError = error;
         }
 
+        /// <summary>
+        /// Begins tracking system call errors on the calling thread during PAL APIs. The system call errors may include
+        /// information about the system call made, relevant arguments, return values, and error codes. A call to this method
+        /// should be followed by a call to <see cref="EndTrackingSystemCallErrors"/> on the same thread, which returns the set
+        /// of system call errors that occurred on the thread in that period. Only system call errors that lead to PAL API
+        /// failures may be tracked.
+        /// </summary>
+        internal static void BeginTrackingSystemCallErrors() { }
+
+        /// <summary>
+        /// Retrieves system call errors that occurred on the calling thread since <see cref="BeginTrackingSystemCallErrors"/>
+        /// was called.
+        /// </summary>
+        /// <param name="getSystemCallErrors">Indicates whether to return the accumulated system call errors.</param>
+        /// <returns>
+        /// System call errors that occurred on the calling thread since <see cref="BeginTrackingSystemCallErrors"/> was called.
+        /// Returns <code>null</code> if <see cref="BeginTrackingSystemCallErrors"/> has not been called, or if no system call
+        /// errors occurred on the calling thread since it was last called.
+        /// </returns>
+        internal static string EndTrackingSystemCallErrors(bool getSystemCallErrors) => null;
+
         internal static bool IsPinnable(object o)
         {
             return (o == null) || !o.GetEETypePtr().ContainsGCPointers;

src/coreclr/pal/inc/pal.h

@@ -3792,6 +3792,16 @@ PALAPI
 SetLastError(
          IN DWORD dwErrCode);
 
+PALIMPORT
+VOID
+PALAPI
+PAL_BeginTrackingSystemCallErrors();
+
+PALIMPORT
+LPCSTR
+PALAPI
+PAL_EndTrackingSystemCallErrors(bool getSystemCallErrors);
+
 PALIMPORT
 LPWSTR
 PALAPI

src/coreclr/pal/src/include/pal/sharedmemory.h

@@ -114,10 +114,12 @@ class SharedMemoryHelpers
     static int CreateOrOpenFile(LPCSTR path, bool createIfNotExist = true, bool *createdRef = nullptr);
     static void CloseFile(int fileDescriptor);
 
-    static SIZE_T GetFileSize(int fileDescriptor);
-    static void SetFileSize(int fileDescriptor, SIZE_T byteCount);
+    static int ChangeMode(LPCSTR path, mode_t mode);
 
-    static void *MemoryMapFile(int fileDescriptor, SIZE_T byteCount);
+    static SIZE_T GetFileSize(LPCSTR filePath, int fileDescriptor);
+    static void SetFileSize(LPCSTR filePath, int fileDescriptor, SIZE_T byteCount);
+
+    static void *MemoryMapFile(LPCSTR filePath, int fileDescriptor, SIZE_T byteCount);
 
     static bool TryAcquireFileLock(int fileDescriptor, int operation);
     static void ReleaseFileLock(int fileDescriptor);

src/coreclr/pal/src/include/pal/thread.hpp

@@ -304,6 +304,10 @@ namespace CorUnix
         // Signal handler's alternate stack to help with stack overflow
         void* m_alternateStack;
 
+        bool m_isTrackingSystemCallErrors;
+        int m_systemCallErrorsLength;
+        char *m_systemCallErrors;
+
         //
         // The thread entry routine (called from InternalCreateThread)
         //
@@ -358,7 +362,10 @@ namespace CorUnix
             m_fStartStatusSet(FALSE),
             m_stackBase(NULL),
             m_stackLimit(NULL),
-            m_alternateStack(NULL)
+            m_alternateStack(NULL),
+            m_isTrackingSystemCallErrors(false),
+            m_systemCallErrorsLength(0),
+            m_systemCallErrors(NULL)
         {
         };
 
@@ -460,6 +467,22 @@ namespace CorUnix
             return errno;
         };
 
+        void
+        BeginTrackingSystemCallErrors(
+            void
+            );
+
+        static void
+        AppendSystemCallError(
+            LPCSTR format,
+            ...
+            );
+
+        LPCSTR
+        EndTrackingSystemCallErrors(
+            bool getSystemCallErrors
+            );
+
         void
         SetExitCode(
             DWORD dwExitCode

src/coreclr/pal/src/include/pal/utils.h

@@ -212,3 +212,6 @@ class StringHolder
 
    };
 #endif /* _PAL_UTILS_H_ */
+
+const int RawErrorCodeStringBufferSize = 12;
+const char *GetFriendlyErrorCodeString(int errorCode, char (&rawErrorCodeStringBuffer)[RawErrorCodeStringBufferSize]);

src/coreclr/pal/src/misc/error.cpp

@@ -84,3 +84,70 @@ SetLastError(
     CPalThread::SetLastError(dwErrCode);
 }
 
+/*++
+Function:
+  PAL_BeginTrackingSystemCallErrors
+
+PAL_BeginTrackingSystemCallErrors
+
+The PAL_BeginTrackingSystemCallErrors function begins tracking system call errors on the calling thread during PAL APIs. The
+system call errors may include information about the system call made, relevant arguments, return values, and error codes. A
+call to this function should be followed by a call to PAL_EndTrackingSystemCallErrors on the same thread, which returns the set
+of system call errors that occurred on the thread in that period. This may not track all system call errors, it may only track
+system call errors that directly or indirectly lead to PAL API failures.
+
+Parameters
+
+This function has no parameters.
+
+Return Values
+
+This function does not return a value.
+
+--*/
+VOID
+PALAPI
+PAL_BeginTrackingSystemCallErrors(
+         VOID)
+{
+    CPalThread *thread = GetCurrentPalThread();
+    if (thread != nullptr)
+    {
+        thread->BeginTrackingSystemCallErrors();
+    }
+}
+
+/*++
+Function:
+  PAL_EndTrackingSystemCallErrors
+
+PAL_EndTrackingSystemCallErrors
+
+The PAL_EndTrackingSystemCallErrors function retrieves system call errors that occurred on the calling thread since
+PAL_BeginTrackingSystemCallErrors was called.
+
+Parameters
+
+This function has no parameters.
+
+Return Values
+
+The return value is the system call errors that occurred on the calling thread since PAL_BeginTrackingSystemCallErrors was
+called. Returns NULL if PAL_BeginTrackingSystemCallErrors has not been called, or if no system call errors occurred on the
+calling thread since it was last called. If the returned pointer is not NULL, it is only safe to be used by the calling thread
+and before the next call to PAL_BeginTrackingSystemCallErrors.
+
+--*/
+LPCSTR
+PALAPI
+PAL_EndTrackingSystemCallErrors(
+         bool getSystemCallErrors)
+{
+    CPalThread *thread = GetCurrentPalThread();
+    if (thread != nullptr)
+    {
+        return thread->EndTrackingSystemCallErrors(getSystemCallErrors);
+    }
+
+    return nullptr;
+}

src/coreclr/pal/src/misc/utils.cpp

@@ -366,3 +366,61 @@ BOOL IsRunningOnMojaveHardenedRuntime()
 }
 
 #endif // __APPLE__
+
+const char *GetFriendlyErrorCodeString(int errorCode, char (&rawErrorCodeStringBuffer)[RawErrorCodeStringBufferSize])
+{
+    switch (errorCode)
+    {
+        case EACCES: return "EACCES";
+        case EBADF: return "EBADF";
+        case EBUSY: return "EBUSY";
+        case EDQUOT: return "EDQUOT";
+        case EEXIST: return "EEXIST";
+        case EFAULT: return "EFAULT";
+        case EFBIG: return "EFBIG";
+        case EINVAL: return "EINVAL";
+        case EINTR: return "EINTR";
+        case EIO: return "EIO";
+        case EISDIR: return "EISDIR";
+        case ELOOP: return "ELOOP";
+        case EMFILE: return "EMFILE";
+        case EMLINK: return "EMLINK";
+        case ENAMETOOLONG: return "ENAMETOOLONG";
+        case ENFILE: return "ENFILE";
+        case ENODEV: return "ENODEV";
+        case ENOENT: return "ENOENT";
+        case ENOLCK: return "ENOLCK";
+        case ENOMEM: return "ENOMEM";
+        case ENOSPC: return "ENOSPC";
+        case ENOTDIR: return "ENOTDIR";
+        case ENOTEMPTY: return "ENOTEMPTY";
+        case ENXIO: return "ENXIO";
+        case EOVERFLOW: return "EOVERFLOW";
+        case EPERM: return "EPERM";
+        case EROFS: return "EROFS";
+        case ETXTBSY: return "ETXTBSY";
+        case EXDEV: return "EXDEV";
+    }
+
+    if (errorCode == EAGAIN || errorCode == EWOULDBLOCK)
+    {
+        if (EAGAIN == EWOULDBLOCK) return "EAGAIN/EWOULDBLOCK";
+        if (errorCode == EAGAIN) return "EAGAIN";
+        return "EWOULDBLOCK";
+    }
+    else if (errorCode == ENOTSUP || errorCode == EOPNOTSUPP)
+    {
+        if (ENOTSUP == EOPNOTSUPP) return "ENOTSUP/EOPNOTSUPP";
+        if (errorCode == ENOTSUP) return "ENOTSUP";
+        return "EOPNOTSUPP";
+    }
+
+    int result =
+        _snprintf_s(rawErrorCodeStringBuffer, RawErrorCodeStringBufferSize, RawErrorCodeStringBufferSize - 1, "%d", errorCode);
+    if (result <= 0 || result >= RawErrorCodeStringBufferSize)
+    {
+        rawErrorCodeStringBuffer[0] = '\0';
+    }
+
+    return rawErrorCodeStringBuffer;
+}