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libxc: make mmap() failure message more verbose

PATCH New Christoph Egger 1 participant 1 message Nov 29, 2007

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Christoph Egger

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PATCH 1/1 libxc: make mmap() failure message more verbose

Hi!

Attached patch makes mmap() failure message more verbose.

Signed-off-by Christoph Egger <[email protected]>
Signature · 12 lines
AMD Saxony, Dresden, Germany
Operating System Research Center

Legal Information:
AMD Saxony Limited Liability Company & Co. KG
Sitz (Geschäftsanschrift):
   Wilschdorfer Landstr. 101, 01109 Dresden, Deutschland
Registergericht Dresden: HRA 4896
vertretungsberechtigter Komplementär:
   AMD Saxony LLC (Sitz Wilmington, Delaware, USA)
Geschäftsführer der AMD Saxony LLC:
   Dr. Hans-R. Deppe, Thomas McCoy
tools/libxc/xc_dom_core.c +6 -2
diff -r 26e766e0c628 tools/libxc/xc_dom_core.c
@@ -352,15 +352,19 @@ void *xc_dom_pfn_to_ptr(struct xc_dom_im
     }
     else
     {
+        int err;
+
         mode = "anonymous memory";
         phys->ptr = mmap(NULL, phys->count << page_shift,
                          PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON,
                          -1, 0);
         if ( phys->ptr == MAP_FAILED )
         {
+            err = errno;
             xc_dom_panic(XC_OUT_OF_MEMORY,
-                         "%s: oom: can't allocate 0x%" PRIpfn " pages\n",
-                         __FUNCTION__, count);
+                         "%s: oom: can't allocate 0x%" PRIpfn " pages"
+                         " [mmap, errno=%i (%s)]\n",
+                         __FUNCTION__, count, err, strerror(err));
             return NULL;
         }
         dom->alloc_mem_map += phys->count << page_shift;

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