1 files changed, 84 insertions, 0 deletions

diff --git a/tools/perf/util/perf-hooks.c b/tools/perf/util/perf-hooks.c
new file mode 100644
index 000000000000..4ce88e37dd63
--- /dev/null
+++ b/tools/perf/util/perf-hooks.c
@@ -0,0 +1,84 @@
+/*
+ * perf_hooks.c
+ *
+ * Copyright (C) 2016 Wang Nan <wangnan0@huawei.com>
+ * Copyright (C) 2016 Huawei Inc.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <linux/err.h>
+#include "util/util.h"
+#include "util/debug.h"
+#include "util/perf-hooks.h"
+
+static sigjmp_buf jmpbuf;
+static const struct perf_hook_desc *current_perf_hook;
+
+void perf_hooks__invoke(const struct perf_hook_desc *desc)
+{
+        if (!(desc && desc->p_hook_func && *desc->p_hook_func))
+                return;
+
+        if (sigsetjmp(jmpbuf, 1)) {
+                pr_warning("Fatal error (SEGFAULT) in perf hook '%s'\n",
+                           desc->hook_name);
+                *(current_perf_hook->p_hook_func) = NULL;
+        } else {
+                current_perf_hook = desc;
+                (**desc->p_hook_func)();
+        }
+        current_perf_hook = NULL;
+}
+
+void perf_hooks__recover(void)
+{
+        if (current_perf_hook)
+                siglongjmp(jmpbuf, 1);
+}
+
+#define PERF_HOOK(name)                                 \
+perf_hook_func_t __perf_hook_func_##name = NULL;        \
+struct perf_hook_desc __perf_hook_desc_##name =         \
+        {.hook_name = #name, .p_hook_func = &__perf_hook_func_##name};
+#include "perf-hooks-list.h"
+#undef PERF_HOOK
+
+#define PERF_HOOK(name)         \
+        &__perf_hook_desc_##name,
+
+static struct perf_hook_desc *perf_hooks[] = {
+#include "perf-hooks-list.h"
+};
+#undef PERF_HOOK
+
+int perf_hooks__set_hook(const char *hook_name,
+                         perf_hook_func_t hook_func)
+{
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
+                if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
+                        continue;
+
+                if (*(perf_hooks[i]->p_hook_func))
+                        pr_warning("Overwrite existing hook: %s\n", hook_name);
+                *(perf_hooks[i]->p_hook_func) = hook_func;
+                return 0;
+        }
+        return -ENOENT;
+}
+
+perf_hook_func_t perf_hooks__get_hook(const char *hook_name)
+{
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
+                if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
+                        continue;
+
+                return *(perf_hooks[i]->p_hook_func);
+        }
+        return ERR_PTR(-ENOENT);
+}