From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
Add tracefs_kprobe_info() that returns the type of a given probe, and may
also return the content of the parsed kprobe_events file.
If @type is non NULL, it will hold the content of the kprobe before the
":'.
If @addr is non NULL, it will hold the content of the kprobe's address or
function that it is attached to.
If @format is non NULL, it will hold the format string of the kprobe.
It returns:
TRACEFS_ALL_KPROBES if an error occurs or the kprobe is not found,
or the probe is of an unknown type.
Having @type set, can help debug an unknown type.
TRACEFS_KPROBE if the type of kprobe found is a normal kprobe.
TRACEFS_KRETPROBE if the type of kprobe found is a kretprobe.
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
include/tracefs.h | 2 ++
src/tracefs-kprobes.c | 72 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 74 insertions(+)
diff --git a/include/tracefs.h b/include/tracefs.h
index e8a2008d9714..f0ab7c96e4ab 100644
--- a/include/tracefs.h
+++ b/include/tracefs.h
@@ -226,4 +226,6 @@ 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);
char **tracefs_get_kprobes(enum tracefs_kprobe_type type);
+enum tracefs_kprobe_type tracefs_kprobe_info(const char *group, const char *event,
+ char **type, char **addr, char **format);
#endif /* _TRACE_FS_H */
diff --git a/src/tracefs-kprobes.c b/src/tracefs-kprobes.c
index 713715e96f4f..5442b6c17638 100644
--- a/src/tracefs-kprobes.c
+++ b/src/tracefs-kprobes.c
@@ -18,6 +18,7 @@
#include "tracefs-local.h"
#define KPROBE_EVENTS "kprobe_events"
+#define KPROBE_DEFAULT_GROUP "kprobes"
static int insert_kprobe(const char *type, const char *system,
const char *event, const char *addr,
@@ -238,3 +239,74 @@ char **tracefs_get_kprobes(enum tracefs_kprobe_type type)
list = NULL;
goto out;
}
+
+/**
+ * tracefs_kprobe_info - return the type of kprobe specified.
+ * @group: The group the kprobe is in (NULL for the default "kprobes")
+ * @event: The name of the kprobe to find.
+ * @type: String to return kprobe type (before ':') NULL to ignore.
+ * @addr: String to return address kprobe is attached to. NULL to ignore.
+ * @format: String to return kprobe format. NULL to ignore.
+ *
+ * If @type, @addr, or @format is non NULL, then the returned string
+ * must be freed with free(). They will also be set to NULL, and
+ * even on error, they may contain strings to be freed. If they are
+ * not NULL, then they still need to be freed.
+ *
+ * Returns TRACEFS_ALL_KPROBES if an error occurs or the kprobe is not found,
+ * or the probe is of an unknown type.
+ * TRACEFS_KPROBE if the type of kprobe found is a normal kprobe.
+ * TRACEFS_KRETPROBE if the type of kprobe found is a kretprobe.
+ */
+enum tracefs_kprobe_type tracefs_kprobe_info(const char *group, const char *event,
+ char **type, char **addr, char **format)
+{
+ enum tracefs_kprobe_type rtype = TRACEFS_ALL_KPROBES;
+ char *saveptr;
+ char *content;
+ char *system;
+ char *probe;
+ char *ktype;
+ char *kaddr;
+ char *kfmt;
+ int ret;
+
+ if (!group)
+ group = KPROBE_DEFAULT_GROUP;
+
+ if (type)
+ *type = NULL;
+ if (addr)
+ *addr = NULL;
+ if (format)
+ *format = NULL;
+
+ content = tracefs_instance_file_read(NULL, KPROBE_EVENTS, NULL);
+ if (!content)
+ return rtype;
+
+ ret = parse_kprobe(content, &saveptr, &ktype, &system, &probe,
+ &kaddr, &kfmt);
+
+ while (!ret) {
+
+ if (!strcmp(system, group) && !strcmp(probe, event)) {
+ if (type)
+ *type = strdup(ktype);
+ if (addr)
+ *addr = strdup(kaddr);
+ if (format)
+ *format = strdup(kfmt);
+
+ switch (*ktype) {
+ case 'p': rtype = TRACEFS_KPROBE; break;
+ case 'r': rtype = TRACEFS_KRETPROBE; break;
+ }
+ break;
+ }
+ ret = parse_kprobe(NULL, &saveptr, &ktype, &system, &probe,
+ &kaddr, &kfmt);
+ }
+ free(content);
+ return rtype;
+}
--
2.30.2
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