[PATCH] libxc: improve error message

[PATCH] libxc: improve error message

[Christoph Egger]

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Hi!

Attached patch improves error message when starting a domain
and mmap() fails, which may happen on too rigorous rlimit
settings.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>


-- 
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

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diff -r 40bf3ffff484 tools/libxc/xc_dom_boot.c
--- a/tools/libxc/xc_dom_boot.c	Thu Sep 20 16:02:22 2007 +0100
+++ b/tools/libxc/xc_dom_boot.c	Fri Sep 21 14:17:26 2007 +0000
@@ -152,6 +152,7 @@ void *xc_dom_boot_domU_map(struct xc_dom
     privcmd_mmap_entry_t *entries;
     void *ptr;
     int i, rc;
+    int err;
 
     entries = xc_dom_malloc(dom, count * sizeof(privcmd_mmap_entry_t));
     if ( entries == NULL )
@@ -166,9 +167,11 @@ void *xc_dom_boot_domU_map(struct xc_dom
                MAP_SHARED, dom->guest_xc, 0);
     if ( ptr == MAP_FAILED )
     {
-        xc_dom_panic(XC_INTERNAL_ERROR,
-                     "%s: failed to mmap domU pages 0x%" PRIpfn "+0x%" PRIpfn
-                     " [mmap]\n", __FUNCTION__, pfn, count);
+        err = errno;
+        xc_dom_panic(XC_INTERNAL_ERROR,
+                     "%s: failed to mmap domU pages 0x%" PRIpfn "+0x%" PRIpfn
+                     " [mmap, errno=%i (%s)]\n", __FUNCTION__, pfn, count,
+                     err, strerror(err));
         return NULL;
     }
 

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