MINOR: tools: add functions to retrieve the address of a symbol
get_sym_curr_addr() will return the address of the first occurrence of
the given symbol while get_sym_next_addr() will return the address of
the next occurrence of the symbol. These ones return NULL on non-linux,
non-ELF, non-USE_DL.
diff --git a/include/haproxy/tools.h b/include/haproxy/tools.h
index e09e17e..92d5b70 100644
--- a/include/haproxy/tools.h
+++ b/include/haproxy/tools.h
@@ -1003,6 +1003,8 @@
int may_access(const void *ptr);
const void *resolve_sym_name(struct buffer *buf, const char *pfx, const void *addr);
const char *get_exec_path();
+void *get_sym_curr_addr(const char *name);
+void *get_sym_next_addr(const char *name);
/* Note that this may result in opening libgcc() on first call, so it may need
* to have been called once before chrooting.
diff --git a/src/tools.c b/src/tools.c
index c103817..056c9ca 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -4740,7 +4740,50 @@
#endif
return ret;
}
+
+/* Tries to retrieve the address of the first occurrence symbol <name>.
+ * Note that NULL in return is not always an error as a symbol may have that
+ * address in special situations.
+ */
+void *get_sym_curr_addr(const char *name)
+{
+ void *ptr = NULL;
+
+#ifdef RTLD_DEFAULT
+ ptr = dlsym(RTLD_DEFAULT, name);
+#endif
+ return ptr;
+}
+
+
+/* Tries to retrieve the address of the next occurrence of symbol <name>
+ * Note that NULL in return is not always an error as a symbol may have that
+ * address in special situations.
+ */
+void *get_sym_next_addr(const char *name)
+{
+ void *ptr = NULL;
+
+#ifdef RTLD_NEXT
+ ptr = dlsym(RTLD_NEXT, name);
#endif
+ return ptr;
+}
+
+#else /* elf & linux & dl */
+
+/* no possible resolving on other platforms at the moment */
+void *get_sym_curr_addr(const char *name)
+{
+ return NULL;
+}
+
+void *get_sym_next_addr(const char *name)
+{
+ return NULL;
+}
+
+#endif /* elf & linux & dl */
/* Tries to append to buffer <buf> some indications about the symbol at address
* <addr> using the following form: