imp - Set LD_LIBRARY_PATH

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We need to set LD_LIBRARY_PATH.

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Type: imp
Breaking: False
Doc Required: False
Backport Required: False
Part: 1/1

NativeLand/LibraryManager.cs

@@ -104,6 +104,10 @@ internal void LoadLibraries(LibraryItem item)
         internal void LoadNixLibrary(string path)
         {
             _logger?.LogInformation($"Calling dlopen for {path}");
+            string folder = Path.GetDirectoryName(path);
+            int pathResult = setenv("LD_LIBRARY_PATH", $":{folder}", 0);
+            if (pathResult != 0)
+                throw new Exception("Unable to set LD_LIBRARY_PATH");
             try
             {
                 var result = dlopen(path, RTLD_LAZY | RTLD_GLOBAL);
@@ -139,6 +143,12 @@ internal void LoadWindowsLibrary(string path)
 
         [DllImport("libdl.so.2", EntryPoint = "dlopen")]
         private static extern IntPtr dlopen_new(string file, int mode);
+
+        /// <summary>
+        /// int setenv(const char *name, const char *value, int overwrite);
+        /// </summary>
+        [DllImport("libc", CharSet = CharSet.Ansi)]
+        internal static extern int setenv(string name, string value, int overwrite);
         #endregion
 
         #region LoadLibraryEx