This patch is a follow-on to commit 894bea93 "kexec-tools: Perform
run-time linking of libxenctrl.so". This patch addresses feedback
from Daniel Kiper.
This patch implements Daniel's suggestion to make the
xc_dlhandle variable static.
Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx>
Reviewed-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
---
v1: 23jan2018
- Implemented feedback from Daniel Kiper
v2: 23jan2018
- Implemented feedback from Daniel Kiper
- Broke patch into two
v3: 24jan2018
- Implemented feedback from Daniel Kiper
- Added 'extern' to the new declarations in kexec-xen.h
---
kexec/kexec-xen.c | 9 ++++++++-
kexec/kexec-xen.h | 13 ++++++-------
2 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/kexec/kexec-xen.c b/kexec/kexec-xen.c
index 75f8758..960fa16 100644
--- a/kexec/kexec-xen.c
+++ b/kexec/kexec-xen.c
@@ -15,8 +15,15 @@
#include "crashdump.h"
#ifdef CONFIG_LIBXENCTRL_DL
-void *xc_dlhandle;
+/* The handle from dlopen(), needed by dlsym(), dlclose() */
+static void *xc_dlhandle;
xc_hypercall_buffer_t XC__HYPERCALL_BUFFER_NAME(HYPERCALL_BUFFER_NULL);
+
+void *__xc_dlsym(const char *symbol)
+{
+ return dlsym(xc_dlhandle, symbol);
+}
+
xc_interface *__xc_interface_open(xentoollog_logger *logger,
xentoollog_logger *dombuild_logger,
unsigned open_flags)
diff --git a/kexec/kexec-xen.h b/kexec/kexec-xen.h
index ffb8743..ef08d2c 100644
--- a/kexec/kexec-xen.h
+++ b/kexec/kexec-xen.h
@@ -6,28 +6,27 @@
#ifdef CONFIG_LIBXENCTRL_DL
#include <dlfcn.h>
-
-/* The handle from dlopen(), needed by dlsym(), dlclose() */
-extern void *xc_dlhandle;
+/* Lookup symbols in libxenctrl.so */
+extern void *__xc_dlsym(const char *symbol);
/* Wrappers around xc_interface_open/close() to insert dlopen/dlclose() */
-xc_interface *__xc_interface_open(xentoollog_logger *logger,
+extern xc_interface *__xc_interface_open(xentoollog_logger *logger,
xentoollog_logger *dombuild_logger,
unsigned open_flags);
-int __xc_interface_close(xc_interface *xch);
+extern int __xc_interface_close(xc_interface *xch);
/* GCC expression statements for evaluating dlsym() */
#define __xc_call(dtype, name, args...) \
( \
{ dtype value; \
typedef dtype (*func_t)(xc_interface *, ...); \
- func_t func = dlsym(xc_dlhandle, #name); \
+ func_t func = __xc_dlsym(#name); \
value = func(args); \
value; } \
)
#define __xc_data(dtype, name) \
( \
- { dtype *value = (dtype *)dlsym(xc_dlhandle, #name); value; } \
+ { dtype *value = (dtype *)__xc_dlsym(#name); value; } \
)
/* The wrappers around utilized xenctrl.h functions */
--
2.7.4
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