Changeset 3662 in kBuild

Timestamp:

Feb 20, 2025 4:30:45 PM (3 weeks ago)

Author:

bird

Message:

kmk/output.c: Debugging code for the mysterious 'kmk: write error: stdout' problem...

File:

• trunk/src/kmk/output.c (modified) (2 diffs)

trunk/src/kmk/output.c

@@ -58 +58 @@
 #else
 # define STREAM_OK(_s) 1
+#endif
+
+#if defined(KMK) && defined(KBUILD_OS_WINDOWS) && 1
+/* fflush wrapper w/ error checking + reporting for stdout.
+   This is to debug the mysterious 'kmk: write error: stdout' errors. */
+int g_fStdOutError = 0;
+
+static int my_fflush (FILE *pFile)
+{
+  if (pFile == stdout && !g_fStdOutError)
+    {
+      if (!ferror (pFile))
+        {
+          int rcRet = fflush (pFile);
+          g_fStdOutError = ferror(g_fStdOutError);
+          if (rcRet != EOF && !g_fStdOutError)
+            { /* likely */ }
+          else if (rcRet == EOF)
+            fprintf (stderr, "kmk: fflush(stdout): flush failed! errno=%d\n", errno);
+          else
+            fprintf (stderr, "kmk: fflush(stdout): error pending after successful flush! errno=%d\n", errno);
+
+          return rcRet;
+        }
+      else
+        {
+          fprintf (stderr, "kmk: fflush(stdout): error pending on entry! errno=%d\n", errno);
+          g_fStdOutError = 1;
+        }
+
+    }
+  return fflush (pFile);
+}
+
+# undef  fflush
+# undef  fflush(a_pFile) my_fflush(a_pFile)
+
 #endif
 
@@ -194 +231 @@
             }
           if (dst != prevdst)
-            fflush(prevdst);
+            fflush (prevdst);
           prevdst = dst;
 #ifdef KMK