kernel日志时间转换函数

1. 原理说明:参考了这篇文章http://blog.csdn.net/transformer_han/article/details/24741605,但因其只对mtk平台kernel log有效。qcom平台kernel log无效。因为qcom平台kernel log中根本就没有写包含android time标签的信息。所以自己改了一下使其支持qcom平台,原理基本一致区别就是搜索'audit('关键字获取时间戳,然后通过与改时间戳对应的kernel时间的差进行计算得到格式化时间;

2: 使用方式,保存代码成任意XXX.py,然后执行python XXX.px inputfilename,其中inputfilename是要转换的kmsg文件名称,然后会在XXX.py所在目录生成inputfilename_translated文件

import timeimport sysimport osdef usage():    print('''Help Information:             kmsg_translate inputfile:   input file  to parse                                ''')if len(sys.argv) < 2:    usage()    sys.exit(2)inpath = sys.argv[1]print "parameter"print inpathprint "parameter"def calc_delta(stream):    global s_second    global s_microsecond    global a_time    global outfile    if a_time ==None:        print("Can't convert to android time")        exit(-1)    for line in stream:        if line:            try:                begin_index =  line.index('[')                end_index = line[begin_index+1:].index(']')+begin_index+1                time_string = line[begin_index + 1 :end_index]                [d_second,d_microsecond] = time_string.split('.')                delta_second = int(int(d_second) - int(s_second))                delta_microsecond = int(int(d_microsecond)-int(s_microsecond))                [t_second, t_microsecond] = a_time.split('.')                seconds = (delta_second + int(t_second))                microseconds = (delta_microsecond + int(t_microsecond) * 1000)                if microseconds < 0:                    microseconds = microseconds + 1000000                    seconds = seconds - 1                times = str(seconds)                x = time.localtime(float(times))                realtime = time.strftime('%Y-%m-%d %H:%M:%S', x)                new_line = realtime+ "." + str(microseconds) +' ' + line                outputfile.write(new_line)            except:                outputfile.write(line)  def get_atime(stream):    global s_second    global s_microsecond    global a_time    for line in stream:        if line:            a_time_op = line.find('audit(')            if a_time_op>=1:                begin_index =  line.index('[')                end_index = line[begin_index+1:].index(']')+begin_index+1                date_string = line[a_time_op + 6 :a_time_op+20]                abs_time = line[begin_index + 1 :end_index]                [s_second,s_microsecond] = abs_time.split('.')                a_time = date_string;                break def main():    global inputfile    global outputfile    if inpath == None:        usage()        sys.exit(2)    inputfile = open(inpath, 'r')    outputfile = open(os.getcwd() + '/' + inpath + '_translated', 'w')    get_atime(inputfile)    inputfile.seek(0)    calc_delta(inputfile)    inputfile.close()    outputfile.close()if __name__ == "__main__":    main()