Add C library detection to processinfo3 test (#88260)

src/tests/tracing/eventpipe/processinfo3/processinfo3.cs

@@ -288,7 +288,29 @@ public static int Main()
  }
  else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
  {
- expectedPortableRidOs = "linux";
+ // Check process modules for C library type indication to determine
+ // which linux RID OS is applicable.
+ Logger.logger.Log("Begin checking process modules to determine C library type.");
+ for (int i = 0; i < currentProcess.Modules.Count; i++)
+ {
+ ProcessModule module = currentProcess.Modules[i];
+ Logger.logger.Log($"- {module.ModuleName}");
+
+ if (module.ModuleName.StartsWith("libc.", StringComparison.Ordinal) ||
+ module.ModuleName.StartsWith("libc-", StringComparison.Ordinal))
+ {
+ Logger.logger.Log("Found gnu libc indicator.");
+ expectedPortableRidOs = "linux";
+ break;
+ }
+ else if (module.ModuleName.StartsWith("ld-musl-", StringComparison.Ordinal))
+ {
+ Logger.logger.Log("Found musl libc indicator.");
+ expectedPortableRidOs = "linux-musl";
+ break;
+ }
+ }
+ Logger.logger.Log("Finished checking process modules.");
  }
 
  Utils.Assert(!string.IsNullOrEmpty(expectedPortableRidOs), $"Unable to calculate expected portable RID OS.");