[PATCH v4 0/7] 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).

Changes since v3: https://lore.kernel.org/linux-trace-devel/20210702031022.154146-1-rostedt@goodmis.org/

 - Silly me used "stat(KPROBE_EVENTS)" to see if the kprobe event
   file existed, but KPROBE_EVENTS is not a full path. Should have
   used tracefs_file_exists() since that's what it's made for.
   My testing missed this, because I forgot to push the changes to
   my test machine, and I tested the code with old logic.

Steven Rostedt (VMware) (7):
  libtracefs: Implement tracefs_instances()
  libtracefs: Implement tracefs_kprobe_raw()
  libtracefs: Implement tracefs_kretprobe_raw()
  libtracefs: Implement tracefs_get_kprobes()
  libtracefs: Implement tracefs_kprobe_clear_all() to remove all kprobes
  libtracefs: Implement tracefs_kprobe_clear_probe()
  libtracefs: Add man pages for kprobe functions

 Documentation/libtracefs-kprobes.txt | 275 +++++++++++++++++++++
 include/tracefs.h                    |   9 +
 src/Makefile                         |   1 +
 src/tracefs-instance.c               |  78 ++++++
 src/tracefs-kprobes.c                | 349 +++++++++++++++++++++++++++
 5 files changed, 712 insertions(+)
 create mode 100644 Documentation/libtracefs-kprobes.txt
 create mode 100644 src/tracefs-kprobes.c

-- 
2.30.2