def sysctl_kernel(key, value=None):
"""(Very) partial implementation of sysctl, for kernel params"""
if value is not None:
# write
utils.write_one_line('/proc/sys/kernel/%s' % key, str(value))
else:
# read
out = utils.read_one_line('/proc/sys/kernel/%s' % key)
return int(re.search(r'\d+', out).group(0))
def sysctl(key, value=None):
"""Generic implementation of sysctl, to read and write.
:param key: A location under /proc/sys
:param value: If not None, a value to write into the sysctl.
:return: The single-line sysctl value as a string.
"""
path = '/proc/sys/%s' % key
if value is not None:
utils.write_one_line(path, str(value))
return utils.read_one_line(path)
def set_power_state(state):
"""
Set the system power state to 'state'.
"""
utils.write_one_line('/sys/power/state', state)
def set_wake_alarm(alarm_time):
"""
Set the hardware RTC-based wake alarm to 'alarm_time'.
"""
utils.write_one_line('/sys/class/rtc/rtc0/wakealarm', str(alarm_time))
