- Bjorn Augustsson reported a bug which made curl not report any problems even

though it failed to write a very small download to disk (done in a single
  fwrite call). It turned out to be because fwrite() returned success, but
  there was insufficient error-checking for the fclose() call which tricked
  curl to believe things were fine.

CHANGES

@@ -6,6 +6,14 @@
 
                                   Changelog
 
+
+Daniel Stenberg (23 Nov 2009)
+- Bjorn Augustsson reported a bug which made curl not report any problems even
+  though it failed to write a very small download to disk (done in a single
+  fwrite call). It turned out to be because fwrite() returned success, but
+  there was insufficient error-checking for the fclose() call which tricked
+  curl to believe things were fine.
+
 Daniel Stenberg (20 Nov 2009)
 - Constantine Sapuntzakis identified a write after close, as the sockets were
   closed by libcurl before the SSL lib were shutdown and they may write to its

RELEASE-NOTES

@@ -25,6 +25,7 @@ This release includes the following bugfixes:
  o never-pruned DNS cached entries
  o HTTP proxy tunnel re-used connection even if tunnel got disabled
  o SSL lib post-close write
+ o curl failed to report write errors for tiny failed downloads
 
 This release includes the following known bugs:
 
@@ -35,6 +36,6 @@ advice from friends like these:
 
  Yang Tse, Kamil Dudka, Christian Schmitz, Constantine Sapuntzakis,
  Marco Maggi, Camille Moncelier, Claes Jakobsson, Kevin Baughman,
- Marc Kleine-Budde, Jad Chamcham
+ Marc Kleine-Budde, Jad Chamcham, Bjorn Augustsson
 
         Thanks! (and sorry if I forgot to mention someone)

src/main.c

@@ -3316,9 +3316,15 @@ static size_t my_fwrite(void *buffer, size_t sz, size_t nmemb, void *stream)
     curl_easy_pause(config->easy, CURLPAUSE_CONT);
   }
 
-  if(config->nobuffer)
+  if(config->nobuffer) {
     /* disable output buffering */
-    fflush(out->stream);
+    rc = fflush(out->stream);
+    if(rc) {
+      /* return a value that isn't the same as sz * nmemb */
+      rc = (0 == (sz * nmemb)) ? 1 : 0;
+      return rc; /* failure */
+    }
+  }
 
   return rc;
 }
@@ -5170,8 +5176,14 @@ show_error:
           }
         }
 
-        if (outfile && !curlx_strequal(outfile, "-") && outs.stream)
+        if (outfile && !curlx_strequal(outfile, "-") && outs.stream) {
-          fclose(outs.stream);
+          int rc = fclose(outs.stream);
+          if(!res && rc) {
+            /* something went wrong in the writing process */
+            res = CURLE_WRITE_ERROR;
+            fprintf(config->errors, "(%s) Failed writing body\n", res);
+          }
+        }
 
 #ifdef HAVE_UTIME
         /* Important that we set the time _after_ the file has been