def __init__(self, proc, timeout=30):
"""
Class constructor. The arguments are as follows.
* proc - the 'Proc' or 'SSH' object that defines the host to operate on. This object will
keep a 'proc' reference and use it in various methods.
* timeout - longest time in seconts to wait for data in the trace buffer.
"""
self._reader = None
self._proc = proc
self.timeout = timeout
self.raw_line = None
mntpoint = FSHelpers.mount_debugfs(proc=proc)
self.ftpath = mntpoint.joinpath("tracing/trace")
self.ftpipe_path = mntpoint.joinpath("tracing/trace_pipe")
for path in (self.ftpath, self.ftpipe_path):
if not FSHelpers.isfile(path, proc=proc):
raise ErrorNotSupported(
f"linux kernel function trace file was not found at "
f"'{path}'{proc.hostmsg}")
cmd = f"cat {self.ftpipe_path}"
name = "stale wult function trace reader process"
ProcHelpers.kill_processes(cmd, log=True, name=name, proc=self._proc)
self._clear()
self._reader = self._proc.run_async(cmd, shell=True)
def disable_ipv6(self):
"""Disable IPv6 for the network interface."""
path = Path("/proc/sys/net/ipv6/conf/{self.ifname}/disable_ipv6")
if FSHelpers.isfile(path, proc=self._proc):
with self._proc.open(path, "w") as fobj:
fobj.write("1")
def _get_module_path(proc, name):
"""Return path to installed module. Return 'None', if module not found."""
cmd = f"modinfo -n {name}"
stdout, _, exitcode = proc.run(cmd)
if exitcode != 0:
return None
modpath = Path(stdout.strip())
if FSHelpers.isfile(modpath, proc):
return modpath
return None