[PATCH v2 0/4] libtracefs: Facilitate adding and removing kprobes

[Steven Rostedt <rostedt@goodmis.org>]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Add a tracefs_kprobe_raw() to facilitate adding kprobe events. It's
denoted as "raw" because it still requires knowing the complex format of
a kprobe, but at least it helps with other formats:

 p:[[system/]event] addr fmt

The user only needs to know the "fmt" part above, and not worry about
what file to open, or how to open it.

Also add a tracefs_kprobe_clear() to clear all kprobes and a
tracefs_kprobe_clear_probe() to clear an individual kprobe. Both have a
"force" parameter, that if set, will then try to disable the kprobe in
all instances (including the top) and then remove the kprobe(s).

(Man pages still coming after this).

Changes since v1:
 - Added a tracefs_instances() to get the names of all instances
 - Rewrote the tracefs_kprobe_clear*() to use the tracefs_instances,
   which simplified the code tremendously.
 - Do not fail on failed: allocating various memory, disabling
   events, finding instances, etc, in the tracefs_kprobe_clear*()
   because it may still succeed, if the failed part were not what
   was causing it to not succeed.

Steven Rostedt (VMware) (4):
  libtracefs: Implement tracefs_instances()
  libtracefs: Implement tracefs_kprobe_raw()
  libtracefs: Implement tracefs_kprobe_clear() to remove all kprobes
  libtracefs: Implement tracefs_kprobe_clear_probe()

 include/tracefs.h      |   6 ++
 src/Makefile           |   1 +
 src/tracefs-instance.c |  78 +++++++++++++++
 src/tracefs-kprobes.c  | 215 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 300 insertions(+)
 create mode 100644 src/tracefs-kprobes.c

-- 
2.30.2