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annotate planemo/lib/python3.7/site-packages/psutil/_psposix.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 # Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
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2 # Use of this source code is governed by a BSD-style license that can be
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3 # found in the LICENSE file.
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4
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5 """Routines common to all posix systems."""
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6
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7 import glob
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8 import os
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9 import signal
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10 import sys
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11 import time
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12
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13 from ._common import memoize
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14 from ._common import sdiskusage
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15 from ._common import TimeoutExpired
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16 from ._common import usage_percent
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17 from ._compat import ChildProcessError
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18 from ._compat import FileNotFoundError
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19 from ._compat import InterruptedError
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20 from ._compat import PermissionError
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21 from ._compat import ProcessLookupError
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22 from ._compat import PY3
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23 from ._compat import unicode
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24
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25 if sys.version_info >= (3, 4):
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26 import enum
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27 else:
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28 enum = None
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29
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30
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31 __all__ = ['pid_exists', 'wait_pid', 'disk_usage', 'get_terminal_map']
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32
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33
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34 def pid_exists(pid):
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35 """Check whether pid exists in the current process table."""
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36 if pid == 0:
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37 # According to "man 2 kill" PID 0 has a special meaning:
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38 # it refers to <<every process in the process group of the
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39 # calling process>> so we don't want to go any further.
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40 # If we get here it means this UNIX platform *does* have
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41 # a process with id 0.
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42 return True
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43 try:
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44 os.kill(pid, 0)
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45 except ProcessLookupError:
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46 return False
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47 except PermissionError:
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48 # EPERM clearly means there's a process to deny access to
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49 return True
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50 # According to "man 2 kill" possible error values are
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51 # (EINVAL, EPERM, ESRCH)
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52 else:
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53 return True
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54
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55
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56 # Python 3.5 signals enum (contributed by me ^^):
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57 # https://bugs.python.org/issue21076
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58 if enum is not None and hasattr(signal, "Signals"):
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59 Negsignal = enum.IntEnum(
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60 'Negsignal', dict([(x.name, -x.value) for x in signal.Signals]))
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61
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62 def negsig_to_enum(num):
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63 """Convert a negative signal value to an enum."""
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64 try:
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65 return Negsignal(num)
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66 except ValueError:
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67 return num
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68 else:
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69 def negsig_to_enum(num):
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70 return num
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71
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72
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73 def wait_pid(pid, timeout=None, proc_name=None,
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74 _waitpid=os.waitpid,
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75 _timer=getattr(time, 'monotonic', time.time),
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76 _min=min,
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77 _sleep=time.sleep,
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78 _pid_exists=pid_exists):
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79 """Wait for a process PID to terminate.
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80
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81 If the process terminated normally by calling exit(3) or _exit(2),
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82 or by returning from main(), the return value is the positive integer
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83 passed to *exit().
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84
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85 If it was terminated by a signal it returns the negated value of the
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86 signal which caused the termination (e.g. -SIGTERM).
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87
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88 If PID is not a children of os.getpid() (current process) just
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89 wait until the process disappears and return None.
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90
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91 If PID does not exist at all return None immediately.
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92
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93 If *timeout* != None and process is still alive raise TimeoutExpired.
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94 timeout=0 is also possible (either return immediately or raise).
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95 """
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96 if pid <= 0:
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97 raise ValueError("can't wait for PID 0") # see "man waitpid"
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98 interval = 0.0001
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99 flags = 0
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100 if timeout is not None:
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101 flags |= os.WNOHANG
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102 stop_at = _timer() + timeout
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103
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104 def sleep(interval):
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105 # Sleep for some time and return a new increased interval.
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106 if timeout is not None:
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107 if _timer() >= stop_at:
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108 raise TimeoutExpired(timeout, pid=pid, name=proc_name)
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109 _sleep(interval)
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110 return _min(interval * 2, 0.04)
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111
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112 # See: https://linux.die.net/man/2/waitpid
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113 while True:
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114 try:
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115 retpid, status = os.waitpid(pid, flags)
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116 except InterruptedError:
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117 interval = sleep(interval)
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118 except ChildProcessError:
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119 # This has two meanings:
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120 # - PID is not a child of os.getpid() in which case
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121 # we keep polling until it's gone
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122 # - PID never existed in the first place
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123 # In both cases we'll eventually return None as we
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124 # can't determine its exit status code.
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125 while _pid_exists(pid):
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126 interval = sleep(interval)
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127 return
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128 else:
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129 if retpid == 0:
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130 # WNOHANG flag was used and PID is still running.
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131 interval = sleep(interval)
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132 continue
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133 elif os.WIFEXITED(status):
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134 # Process terminated normally by calling exit(3) or _exit(2),
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135 # or by returning from main(). The return value is the
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136 # positive integer passed to *exit().
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137 return os.WEXITSTATUS(status)
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138 elif os.WIFSIGNALED(status):
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139 # Process exited due to a signal. Return the negative value
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140 # of that signal.
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141 return negsig_to_enum(-os.WTERMSIG(status))
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142 # elif os.WIFSTOPPED(status):
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143 # # Process was stopped via SIGSTOP or is being traced, and
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144 # # waitpid() was called with WUNTRACED flag. PID is still
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145 # # alive. From now on waitpid() will keep returning (0, 0)
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146 # # until the process state doesn't change.
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147 # # It may make sense to catch/enable this since stopped PIDs
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148 # # ignore SIGTERM.
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149 # interval = sleep(interval)
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150 # continue
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151 # elif os.WIFCONTINUED(status):
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152 # # Process was resumed via SIGCONT and waitpid() was called
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153 # # with WCONTINUED flag.
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154 # interval = sleep(interval)
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155 # continue
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156 else:
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157 # Should never happen.
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158 raise ValueError("unknown process exit status %r" % status)
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159
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160
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161 def disk_usage(path):
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162 """Return disk usage associated with path.
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163 Note: UNIX usually reserves 5% disk space which is not accessible
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164 by user. In this function "total" and "used" values reflect the
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165 total and used disk space whereas "free" and "percent" represent
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166 the "free" and "used percent" user disk space.
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167 """
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168 if PY3:
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169 st = os.statvfs(path)
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170 else:
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171 # os.statvfs() does not support unicode on Python 2:
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172 # - https://github.com/giampaolo/psutil/issues/416
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173 # - http://bugs.python.org/issue18695
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174 try:
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175 st = os.statvfs(path)
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176 except UnicodeEncodeError:
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177 if isinstance(path, unicode):
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178 try:
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179 path = path.encode(sys.getfilesystemencoding())
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180 except UnicodeEncodeError:
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181 pass
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182 st = os.statvfs(path)
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183 else:
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184 raise
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185
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186 # Total space which is only available to root (unless changed
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187 # at system level).
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188 total = (st.f_blocks * st.f_frsize)
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189 # Remaining free space usable by root.
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190 avail_to_root = (st.f_bfree * st.f_frsize)
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191 # Remaining free space usable by user.
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192 avail_to_user = (st.f_bavail * st.f_frsize)
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193 # Total space being used in general.
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194 used = (total - avail_to_root)
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195 # Total space which is available to user (same as 'total' but
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196 # for the user).
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197 total_user = used + avail_to_user
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198 # User usage percent compared to the total amount of space
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199 # the user can use. This number would be higher if compared
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200 # to root's because the user has less space (usually -5%).
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201 usage_percent_user = usage_percent(used, total_user, round_=1)
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202
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203 # NB: the percentage is -5% than what shown by df due to
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204 # reserved blocks that we are currently not considering:
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205 # https://github.com/giampaolo/psutil/issues/829#issuecomment-223750462
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206 return sdiskusage(
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207 total=total, used=used, free=avail_to_user, percent=usage_percent_user)
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208
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209
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210 @memoize
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211 def get_terminal_map():
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212 """Get a map of device-id -> path as a dict.
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213 Used by Process.terminal()
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214 """
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215 ret = {}
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216 ls = glob.glob('/dev/tty*') + glob.glob('/dev/pts/*')
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217 for name in ls:
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218 assert name not in ret, name
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219 try:
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220 ret[os.stat(name).st_rdev] = name
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221 except FileNotFoundError:
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222 pass
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223 return ret