[PATCH 08/11] tests: Lookup extended stat/lstat in mocks

[Roman Bolshakov <r.bolshakov@xxxxxxxxx>]

macOS syscall interface (/usr/lib/system/libsystem_kernel.dylib) has
three kinds of stat but only one of them can be used to fill
"struct stat": stat$INODE64.

virmockstathelpers looks up regular stat instead of stat$INODE64.  That
causes a failure in qemufirmwaretest because "struct stat" is laid out
differently from the values returned by stat.

Introduce VIR_MOCK_REAL_INIT_ALIASED that can be used to lookup
stat$INODE64 and lstat$INODE64 and use it to setup real functions on
macOS.

Signed-off-by: Roman Bolshakov <r.bolshakov@xxxxxxxxx>
---
 tests/virmock.h            | 10 ++++++++++
 tests/virmockstathelpers.c |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/tests/virmock.h b/tests/virmock.h
index 74bb0d5b15..7520bb5d6e 100644
--- a/tests/virmock.h
+++ b/tests/virmock.h
@@ -288,3 +288,13 @@
             abort(); \
         } \
     } while (0)
+
+#define VIR_MOCK_REAL_INIT_ALIASED(name, alias) \
+    do { \
+        if (real_##name == NULL && \
+            !(real_##name = dlsym(RTLD_NEXT, \
+                                  alias))) { \
+            fprintf(stderr, "Missing symbol '" alias "'\n"); \
+            abort(); \
+        } \
+    } while (0)
diff --git a/tests/virmockstathelpers.c b/tests/virmockstathelpers.c
index 0bbea4b437..1f6f831bed 100644
--- a/tests/virmockstathelpers.c
+++ b/tests/virmockstathelpers.c
@@ -138,7 +138,11 @@ static void virMockStatInit(void)
     debug = getenv("VIR_MOCK_STAT_DEBUG");
 
 #ifdef MOCK_STAT
+#ifdef __APPLE__
+    VIR_MOCK_REAL_INIT_ALIASED(stat, "stat$INODE64");
+#else
     VIR_MOCK_REAL_INIT(stat);
+#endif
     fdebug("real stat %p\n", real_stat);
 #endif
 #ifdef MOCK_STAT64
@@ -154,7 +158,11 @@ static void virMockStatInit(void)
     fdebug("real __xstat64 %p\n", real___xstat64);
 #endif
 #ifdef MOCK_LSTAT
+#ifdef __APPLE__
+    VIR_MOCK_REAL_INIT_ALIASED(stat, "lstat$INODE64");
+#else
     VIR_MOCK_REAL_INIT(lstat);
+#endif
     fdebug("real lstat %p\n", real_lstat);
 #endif
 #ifdef MOCK_LSTAT64
-- 
2.22.0

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