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187 lines
6.3 KiB
187 lines
6.3 KiB
# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Routines common to all posix systems."""
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import errno
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import glob
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import os
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import sys
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import time
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from ._common import memoize
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from ._common import sdiskusage
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from ._common import usage_percent
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from ._compat import PY3
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from ._compat import unicode
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__all__ = ['pid_exists', 'wait_pid', 'disk_usage', 'get_terminal_map']
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# This object gets set on "import psutil" from the __init__.py
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# file, see: https://github.com/giampaolo/psutil/issues/1402
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TimeoutExpired = None
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def pid_exists(pid):
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"""Check whether pid exists in the current process table."""
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if pid == 0:
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# According to "man 2 kill" PID 0 has a special meaning:
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# it refers to <<every process in the process group of the
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# calling process>> so we don't want to go any further.
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# If we get here it means this UNIX platform *does* have
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# a process with id 0.
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return True
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try:
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os.kill(pid, 0)
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except OSError as err:
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if err.errno == errno.ESRCH:
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# ESRCH == No such process
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return False
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elif err.errno == errno.EPERM:
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# EPERM clearly means there's a process to deny access to
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return True
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else:
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# According to "man 2 kill" possible error values are
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# (EINVAL, EPERM, ESRCH) therefore we should never get
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# here. If we do let's be explicit in considering this
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# an error.
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raise err
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else:
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return True
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def wait_pid(pid, timeout=None, proc_name=None):
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"""Wait for process with pid 'pid' to terminate and return its
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exit status code as an integer.
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If pid is not a children of os.getpid() (current process) just
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waits until the process disappears and return None.
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If pid does not exist at all return None immediately.
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Raise TimeoutExpired on timeout expired.
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"""
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def check_timeout(delay):
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if timeout is not None:
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if timer() >= stop_at:
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raise TimeoutExpired(timeout, pid=pid, name=proc_name)
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time.sleep(delay)
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return min(delay * 2, 0.04)
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timer = getattr(time, 'monotonic', time.time)
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if timeout is not None:
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def waitcall():
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return os.waitpid(pid, os.WNOHANG)
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stop_at = timer() + timeout
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else:
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def waitcall():
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return os.waitpid(pid, 0)
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delay = 0.0001
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while True:
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try:
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retpid, status = waitcall()
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except OSError as err:
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if err.errno == errno.EINTR:
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delay = check_timeout(delay)
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continue
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elif err.errno == errno.ECHILD:
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# This has two meanings:
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# - pid is not a child of os.getpid() in which case
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# we keep polling until it's gone
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# - pid never existed in the first place
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# In both cases we'll eventually return None as we
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# can't determine its exit status code.
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while True:
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if pid_exists(pid):
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delay = check_timeout(delay)
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else:
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return
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else:
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raise
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else:
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if retpid == 0:
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# WNOHANG was used, pid is still running
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delay = check_timeout(delay)
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continue
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# process exited due to a signal; return the integer of
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# that signal
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if os.WIFSIGNALED(status):
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return -os.WTERMSIG(status)
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# process exited using exit(2) system call; return the
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# integer exit(2) system call has been called with
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elif os.WIFEXITED(status):
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return os.WEXITSTATUS(status)
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else:
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# should never happen
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raise ValueError("unknown process exit status %r" % status)
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def disk_usage(path):
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"""Return disk usage associated with path.
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Note: UNIX usually reserves 5% disk space which is not accessible
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by user. In this function "total" and "used" values reflect the
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total and used disk space whereas "free" and "percent" represent
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the "free" and "used percent" user disk space.
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"""
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if PY3:
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st = os.statvfs(path)
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else:
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# os.statvfs() does not support unicode on Python 2:
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# - https://github.com/giampaolo/psutil/issues/416
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# - http://bugs.python.org/issue18695
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try:
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st = os.statvfs(path)
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except UnicodeEncodeError:
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if isinstance(path, unicode):
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try:
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path = path.encode(sys.getfilesystemencoding())
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except UnicodeEncodeError:
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pass
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st = os.statvfs(path)
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else:
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raise
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# Total space which is only available to root (unless changed
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# at system level).
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total = (st.f_blocks * st.f_frsize)
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# Remaining free space usable by root.
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avail_to_root = (st.f_bfree * st.f_frsize)
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# Remaining free space usable by user.
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avail_to_user = (st.f_bavail * st.f_frsize)
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# Total space being used in general.
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used = (total - avail_to_root)
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# Total space which is available to user (same as 'total' but
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# for the user).
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total_user = used + avail_to_user
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# User usage percent compared to the total amount of space
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# the user can use. This number would be higher if compared
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# to root's because the user has less space (usually -5%).
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usage_percent_user = usage_percent(used, total_user, round_=1)
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# NB: the percentage is -5% than what shown by df due to
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# reserved blocks that we are currently not considering:
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# https://github.com/giampaolo/psutil/issues/829#issuecomment-223750462
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return sdiskusage(
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total=total, used=used, free=avail_to_user, percent=usage_percent_user)
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@memoize
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def get_terminal_map():
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"""Get a map of device-id -> path as a dict.
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Used by Process.terminal()
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"""
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ret = {}
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ls = glob.glob('/dev/tty*') + glob.glob('/dev/pts/*')
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for name in ls:
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assert name not in ret, name
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try:
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ret[os.stat(name).st_rdev] = name
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except OSError as err:
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if err.errno != errno.ENOENT:
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raise
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return ret
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