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jiffies.py
import os def detect_jiffies(): """Returns the number of jiffies per second for this machine. A jiffy is a value used by the kernel to report certain time-based events. Jiffies occur N times per second where N varies depending on the hardware the kernel is running on. This function gets the uptime for the current process, forks a child process and gets the uptime again; finally, using the running time of the child process compared with the uptimes to determine number of jiffies per second. """ uptime1_file = open("/proc/uptime") uptime2_file = open("/proc/uptime") read_uptime1 = uptime1_file.read read_uptime2 = uptime2_file.read while True: uptime1_data = read_uptime1() # Fork a process and exit immediately; this results in the # child process being left around as a zombie until waitpid() # is called. pid = os.fork() if pid == 0: os._exit(0) uptime2_data = read_uptime2() stat_file = open("/proc/%d/stat" % pid) stat_data = stat_file.read() stat_file.close() os.waitpid(pid, 0) seconds_uptime1 = float(uptime1_data.split()[0]) seconds_uptime2 = float(uptime2_data.split()[0]) jiffie_uptime = int(stat_data.split()[21]) jiffies1 = int(jiffie_uptime/seconds_uptime1+0.5) jiffies2 = int(jiffie_uptime/seconds_uptime2+0.5) if jiffies1 == jiffies2: break uptime1_file.seek(0) uptime2_file.seek(0) uptime1_file.close() uptime2_file.close() return jiffies1
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