[PATCH 07/12] libtracefs: Reimplement kprobe raw APIs

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

In order to unify the code and use the new dynamic event helpers, these
kprobe APIs are rewritten:
 kracefs_kprobe_raw()
 kracefs_kretprobe_raw()
The definition and logic of the APIs remain the same.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 src/tracefs-kprobes.c | 44 +++++++++++++++++--------------------------
 1 file changed, 17 insertions(+), 27 deletions(-)

diff --git a/src/tracefs-kprobes.c b/src/tracefs-kprobes.c
index 083a3a9..84a9903 100644
--- a/src/tracefs-kprobes.c
+++ b/src/tracefs-kprobes.c
@@ -148,38 +148,28 @@ void tracefs_kprobe_free(struct tracefs_dynevent *kprobe)
 	dynevent_free(kprobe);
 }
 
-
-static int insert_kprobe(const char *type, const char *system,
-			 const char *event, const char *addr,
-			 const char *format)
+static int kprobe_raw(enum trace_dynevent_type type, const char *system,
+		      const char *event, const char *addr, const char *format)
 {
-	char *str;
+	static struct tracefs_dynevent *kp;
 	int ret;
 
-	if (!tracefs_file_exists(NULL, KPROBE_EVENTS))
-		return -1;
-
-	errno = EBADMSG;
-	if (!addr || !format)
+	kp = kprobe_alloc(type, system, event, addr, format);
+	if (!kp)
 		return -1;
 
-	if (!event)
-		event = addr;
-
-	if (system)
-		ret = asprintf(&str, "%s:%s/%s %s %s\n",
-			       type, system, event, addr, format);
-	else
-		ret = asprintf(&str, "%s:%s %s %s\n",
-			       type, event, addr, format);
-
-	if (ret < 0)
-		return -1;
+	if (type == TRACE_DYNEVENT_KRETPROBE) {
+		free(kp->prefix);
+		kp->prefix = NULL;
+		ret = asprintf(&kp->prefix, "r:");
+		if (ret < 0)
+			return ret;
+	}
 
-	ret = tracefs_instance_file_append(NULL, KPROBE_EVENTS, str);
-	free(str);
+	ret = dynevent_create(kp);
+	dynevent_free(kp);
 
-	return ret < 0 ? ret : 0;
+	return ret;
 }
 
 /**
@@ -205,7 +195,7 @@ static int insert_kprobe(const char *type, const char *system,
 int tracefs_kprobe_raw(const char *system, const char *event,
 		       const char *addr, const char *format)
 {
-	return insert_kprobe("p", system, event, addr, format);
+	return kprobe_raw(TRACE_DYNEVENT_KPROBE, system, event, addr, format);
 }
 
 /**
@@ -231,7 +221,7 @@ int tracefs_kprobe_raw(const char *system, const char *event,
 int tracefs_kretprobe_raw(const char *system, const char *event,
 			  const char *addr, const char *format)
 {
-	return insert_kprobe("r", system, event, addr, format);
+	return kprobe_raw(TRACE_DYNEVENT_KRETPROBE, system, event, addr, format);
 }
 
 /**
-- 
2.31.1