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#!/usr/bin/python
# Copyright (C) 2008 Red Hat Inc.
#
# This file is part of systemtap, and is free software. You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.
import os
import sys
from config_opts import config_opts
def gen_files(dir, subset):
f = open('%s/kprobe_defs.h' % dir, 'w')
# Output the array of kp_data structs
print >>f, "static struct kp_data kp_data[] = {"
i = 0
while i < len(subset):
print >>f, ("\t{ .kp={ .symbol_name=\"%s\", .pre_handler=&handler_pre, }, .use_count=ATOMIC_INIT(0) },"
% (subset[i]))
i += 1
print >>f, "};"
print >>f
f.close()
# Generate the Makefile
f = open('Makefile', 'w')
print >>f, """
EXTRA_CFLAGS :=
EXTRA_CFLAGS += -freorder-blocks
EXTRA_CFLAGS += -Wno-unused -Werror
obj-m := kprobe_module.o"""
f.close()
def run_make_cmd(cmd):
# Before running make, fix up the environment a bit. Clean out a
# few variables that /lib/modules/${KVER}/build/Makefile uses.
os.unsetenv("ARCH")
os.unsetenv("KBUILD_EXTMOD")
os.unsetenv("CROSS_COMPILE")
os.unsetenv("KBUILD_IMAGE")
os.unsetenv("KCONFIG_CONFIG")
os.unsetenv("INSTALL_PATH");
print "Running", cmd
return os.system(cmd)
def gen_module():
f = open(config_opts['probes_current'])
probes = f.readlines()
f.close()
if len(probes) == 0:
print >>sys.stderr, ("Error: no probe points in %s"
% config_opts['probes_current'])
return -1
# Cleanup each probe by stripping whitespace
i = 0
while i < len(probes):
probes[i] = probes[i].rstrip()
i += 1
# Generate necessary files
gen_files(os.getcwd(), probes)
# Try to build the module - add "V=1" at the end for more verbosity
os.system('rm -f ./kprobe_module.ko')
(sysname, nodename, release, version, machine) = os.uname()
cmd = ("make -C \"/lib/modules/%s/build\" M=\"%s\" modules >build.log 2>&1"
% (release, os.getcwd()))
rc = run_make_cmd(cmd)
if os.WEXITSTATUS(rc) != 0:
print >>sys.stderr, "Error: Make failed, see build.log for details"
return -1
return 0
rc = gen_module()
sys.exit(rc)
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