summaryrefslogtreecommitdiffstats
path: root/mysys/guess_malloc_library.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--mysys/guess_malloc_library.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/mysys/guess_malloc_library.c b/mysys/guess_malloc_library.c
new file mode 100644
index 00000000..ed86ae06
--- /dev/null
+++ b/mysys/guess_malloc_library.c
@@ -0,0 +1,65 @@
+/* Copyright (c) 2002, 2015, Oracle and/or its affiliates.
+ Copyright (c) 2012, 2017, MariaDB Corporation.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
+
+/* guess_malloc_library() deduces, to the best of its ability,
+ the currently used malloc library and its version */
+
+#include <stddef.h>
+#include "my_global.h"
+#include <m_string.h>
+
+typedef const char* (*tc_version_type)(int*, int*, const char**);
+typedef int (*mallctl_type)(const char*, void*, size_t*, void*, size_t);
+
+char *guess_malloc_library()
+{
+ tc_version_type tc_version_func;
+ mallctl_type mallctl_func;
+#ifndef HAVE_DLOPEN
+ return (char*) MALLOC_LIBRARY;
+#else
+ static char buf[128];
+
+ if (strcmp(MALLOC_LIBRARY, "system") != 0)
+ {
+ return (char*) MALLOC_LIBRARY;
+ }
+
+ /* tcmalloc */
+ tc_version_func= (tc_version_type) dlsym(RTLD_DEFAULT, "tc_version");
+ if (tc_version_func)
+ {
+ int major, minor;
+ const char* ver_str = tc_version_func(&major, &minor, NULL);
+ strxnmov(buf, sizeof(buf)-1, "tcmalloc ", ver_str, NULL);
+ return buf;
+ }
+
+ /* jemalloc */
+ mallctl_func= (mallctl_type) dlsym(RTLD_DEFAULT, "mallctl");
+ if (mallctl_func)
+ {
+ char *ver;
+ size_t len = sizeof(ver);
+ mallctl_func("version", &ver, &len, NULL, 0);
+ strxnmov(buf, sizeof(buf)-1, "jemalloc ", ver, NULL);
+ return buf;
+ }
+
+ return (char*) MALLOC_LIBRARY;
+#endif
+}
+