/usr/lib64/python2.6/site-packages/psutil
Edit: /usr/lib64/python2.6/site-packages/psutil/_psposix.py (3854B)
# Copyright (c) 2009, Jay Loden, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Routines common to all posix systems."""
import os
import errno
import psutil
import sys
import time
import glob
from psutil._error import TimeoutExpired
from psutil._common import nt_diskinfo, usage_percent, memoize
def pid_exists(pid):
"""Check whether pid exists in the current process table."""
if pid < 0:
return False
try:
os.kill(pid, 0)
except OSError:
e = sys.exc_info()[1]
return e.errno == errno.EPERM
else:
return True
def wait_pid(pid, timeout=None):
"""Wait for process with pid 'pid' to terminate and return its
exit status code as an integer.
If pid is not a children of os.getpid() (current process) just
waits until the process disappears and return None.
If pid does not exist at all return None immediately.
Raise TimeoutExpired on timeout expired.
"""
def check_timeout(delay):
if timeout is not None:
if timer() >= stop_at:
raise TimeoutExpired(pid)
time.sleep(delay)
return min(delay * 2, 0.04)
timer = getattr(time, 'monotonic', time.time)
if timeout is not None:
waitcall = lambda: os.waitpid(pid, os.WNOHANG)
stop_at = timer() + timeout
else:
waitcall = lambda: os.waitpid(pid, 0)
delay = 0.0001
while 1:
try:
retpid, status = waitcall()
except OSError:
err = sys.exc_info()[1]
if err.errno == errno.EINTR:
delay = check_timeout(delay)
continue
elif err.errno == errno.ECHILD:
# This has two meanings:
# - pid is not a child of os.getpid() in which case
# we keep polling until it's gone
# - pid never existed in the first place
# In both cases we'll eventually return None as we
# can't determine its exit status code.
while 1:
if pid_exists(pid):
delay = check_timeout(delay)
else:
return
else:
raise
else:
if retpid == 0:
# WNOHANG was used, pid is still running
delay = check_timeout(delay)
continue
# process exited due to a signal; return the integer of
# that signal
if os.WIFSIGNALED(status):
return os.WTERMSIG(status)
# process exited using exit(2) system call; return the
# integer exit(2) system call has been called with
elif os.WIFEXITED(status):
return os.WEXITSTATUS(status)
else:
# should never happen
raise RuntimeError("unknown process exit status")
def get_disk_usage(path):
"""Return disk usage associated with path."""
st = os.statvfs(path)
free = (st.f_bavail * st.f_frsize)
total = (st.f_blocks * st.f_frsize)
used = (st.f_blocks - st.f_bfree) * st.f_frsize
percent = usage_percent(used, total, _round=1)
# NB: the percentage is -5% than what shown by df due to
# reserved blocks that we are currently not considering:
# http://goo.gl/sWGbH
return nt_diskinfo(total, used, free, percent)
@memoize
def _get_terminal_map():
ret = {}
ls = glob.glob('/dev/tty*') + glob.glob('/dev/pts/*')
for name in ls:
assert name not in ret
try:
ret[os.stat(name).st_rdev] = name
except OSError:
err = sys.exc_info()[1]
if err.errno != errno.ENOENT:
raise
return ret