prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Implement check_pid for .NET
  This is a reminder - I added an `IPython.utils.process.check_pid` function to check if a process exists with a given PID. However, we have a `_process_cli` module containing .NET implementations of these things, and I didn't write the check_pid implementation for .NET.
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `IPython/utils/process.py`
  Content:
  ```
  1 # encoding: utf-8
  2 """
  3 Utilities for working with external processes.
  4 """
  5 
  6 #-----------------------------------------------------------------------------
  7 #  Copyright (C) 2008-2011  The IPython Development Team
  8 #
  9 #  Distributed under the terms of the BSD License.  The full license is in
  10 #  the file COPYING, distributed as part of this software.
  11 #-----------------------------------------------------------------------------
  12 
  13 #-----------------------------------------------------------------------------
  14 # Imports
  15 #-----------------------------------------------------------------------------
  16 from __future__ import print_function
  17 
  18 # Stdlib
  19 import os
  20 import sys
  21 
  22 # Our own
  23 if sys.platform == 'win32':
  24     from ._process_win32 import _find_cmd, system, getoutput, arg_split, check_pid
  25 elif sys.platform == 'cli':
  26     from ._process_cli import _find_cmd, system, getoutput, arg_split
  27 else:
  28     from ._process_posix import _find_cmd, system, getoutput, arg_split, check_pid
  29 
  30 from ._process_common import getoutputerror, get_output_error_code, process_handler
  31 from . import py3compat
  32 
  33 #-----------------------------------------------------------------------------
  34 # Code
  35 #-----------------------------------------------------------------------------
  36 
  37 
  38 class FindCmdError(Exception):
  39     pass
  40 
  41 
  42 def find_cmd(cmd):
  43     """Find absolute path to executable cmd in a cross platform manner.
  44 
  45     This function tries to determine the full path to a command line program
  46     using `which` on Unix/Linux/OS X and `win32api` on Windows.  Most of the
  47     time it will use the version that is first on the users `PATH`.
  48 
  49     Warning, don't use this to find IPython command line programs as there
  50     is a risk you will find the wrong one.  Instead find those using the
  51     following code and looking for the application itself::
  52 
  53         from IPython.utils.path import get_ipython_module_path
  54         from IPython.utils.process import pycmd2argv
  55         argv = pycmd2argv(get_ipython_module_path('IPython.terminal.ipapp'))
  56 
  57     Parameters
  58     ----------
  59     cmd : str
  60         The command line program to look for.
  61     """
  62     try:
  63         path = _find_cmd(cmd).rstrip()
  64     except OSError:
  65         raise FindCmdError('command could not be found: %s' % cmd)
  66     # which returns empty if not found
  67     if path == '':
  68         raise FindCmdError('command could not be found: %s' % cmd)
  69     return os.path.abspath(path)
  70 
  71 
  72 def is_cmd_found(cmd):
  73     """Check whether executable `cmd` exists or not and return a bool."""
  74     try:
  75         find_cmd(cmd)
  76         return True
  77     except FindCmdError:
  78         return False
  79 
  80 
  81 def pycmd2argv(cmd):
  82     r"""Take the path of a python command and return a list (argv-style).
  83 
  84     This only works on Python based command line programs and will find the
  85     location of the ``python`` executable using ``sys.executable`` to make
  86     sure the right version is used.
  87 
  88     For a given path ``cmd``, this returns [cmd] if cmd's extension is .exe,
  89     .com or .bat, and [, cmd] otherwise.
  90 
  91     Parameters
  92     ----------
  93     cmd : string
  94       The path of the command.
  95 
  96     Returns
  97     -------
  98     argv-style list.
  99     """
  100     ext = os.path.splitext(cmd)[1]
  101     if ext in ['.exe', '.com', '.bat']:
  102         return [cmd]
  103     else:
  104         return [sys.executable, cmd]
  105 
  106 
  107 def abbrev_cwd():
  108     """ Return abbreviated version of cwd, e.g. d:mydir """
  109     cwd = py3compat.getcwd().replace('\\','/')
  110     drivepart = ''
  111     tail = cwd
  112     if sys.platform == 'win32':
  113         if len(cwd) < 4:
  114             return cwd
  115         drivepart,tail = os.path.splitdrive(cwd)
  116 
  117 
  118     parts = tail.split('/')
  119     if len(parts) > 2:
  120         tail = '/'.join(parts[-2:])
  121 
  122     return (drivepart + (
  123         cwd == '/' and '/' or tail))
  124
  ```
  
  Path: `IPython/utils/_process_cli.py`
  Content:
  ```
  1 """cli-specific implementation of process utilities.
  2 
  3 cli - Common Language Infrastructure for IronPython. Code
  4       can run on any operating system. Check os.name for os-
  5       specific settings.
  6 
  7 This file is only meant to be imported by process.py, not by end-users.
  8 
  9 This file is largely untested. To become a full drop-in process
  10 interface for IronPython will probably require you to help fill
  11 in the details. 
  12 """
  13 
  14 # Import cli libraries:
  15 import clr
  16 import System
  17 
  18 # Import Python libraries:
  19 import os
  20 
  21 # Import IPython libraries:
  22 from IPython.utils import py3compat
  23 from ._process_common import arg_split
  24 
  25 def _find_cmd(cmd):
  26     """Find the full path to a command using which."""
  27     paths = System.Environment.GetEnvironmentVariable("PATH").Split(os.pathsep)
  28     for path in paths:
  29         filename = os.path.join(path, cmd)
  30         if System.IO.File.Exists(filename):
  31             return py3compat.bytes_to_str(filename)
  32     raise OSError("command %r not found" % cmd)
  33 
  34 def system(cmd):
  35     """
  36     system(cmd) should work in a cli environment on Mac OSX, Linux,
  37     and Windows
  38     """
  39     psi = System.Diagnostics.ProcessStartInfo(cmd)
  40     psi.RedirectStandardOutput = True
  41     psi.RedirectStandardError = True
  42     psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal
  43     psi.UseShellExecute = False
  44     # Start up process:
  45     reg = System.Diagnostics.Process.Start(psi)
  46 
  47 def getoutput(cmd):
  48     """
  49     getoutput(cmd) should work in a cli environment on Mac OSX, Linux,
  50     and Windows
  51     """
  52     psi = System.Diagnostics.ProcessStartInfo(cmd)
  53     psi.RedirectStandardOutput = True
  54     psi.RedirectStandardError = True
  55     psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal
  56     psi.UseShellExecute = False
  57     # Start up process:
  58     reg = System.Diagnostics.Process.Start(psi)
  59     myOutput = reg.StandardOutput
  60     output = myOutput.ReadToEnd()
  61     myError = reg.StandardError
  62     error = myError.ReadToEnd()
  63     return output
  64
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/IPython/utils/_process_cli.py b/IPython/utils/_process_cli.py
  --- a/IPython/utils/_process_cli.py
  +++ b/IPython/utils/_process_cli.py
  @@ -61,3 +61,18 @@
       myError = reg.StandardError
       error = myError.ReadToEnd()
       return output
  +
  +def check_pid(pid):
  +    """
  +    Check if a process with the given PID (pid) exists
  +    """
  +    try:
  +        System.Diagnostics.Process.GetProcessById(pid)
  +        # process with given pid is running
  +        return True
  +    except System.InvalidOperationException:
  +        # process wasn't started by this object (but is running)
  +        return True
  +    except System.ArgumentException:
  +        # process with given pid isn't running
  +        return False 
  diff --git a/IPython/utils/process.py b/IPython/utils/process.py
  --- a/IPython/utils/process.py
  +++ b/IPython/utils/process.py
  @@ -23,7 +23,7 @@
   if sys.platform == 'win32':
       from ._process_win32 import _find_cmd, system, getoutput, arg_split, check_pid
   elif sys.platform == 'cli':
  -    from ._process_cli import _find_cmd, system, getoutput, arg_split
  +    from ._process_cli import _find_cmd, system, getoutput, arg_split, check_pid
   else:
       from ._process_posix import _find_cmd, system, getoutput, arg_split, check_pid
  
verification_info: {"golden_diff": "diff --git a/IPython/utils/_process_cli.py b/IPython/utils/_process_cli.py\n--- a/IPython/utils/_process_cli.py\n+++ b/IPython/utils/_process_cli.py\n@@ -61,3 +61,18 @@\n     myError = reg.StandardError\n     error = myError.ReadToEnd()\n     return output\n+\n+def check_pid(pid):\n+    \"\"\"\n+    Check if a process with the given PID (pid) exists\n+    \"\"\"\n+    try:\n+        System.Diagnostics.Process.GetProcessById(pid)\n+        # process with given pid is running\n+        return True\n+    except System.InvalidOperationException:\n+        # process wasn't started by this object (but is running)\n+        return True\n+    except System.ArgumentException:\n+        # process with given pid isn't running\n+        return False \ndiff --git a/IPython/utils/process.py b/IPython/utils/process.py\n--- a/IPython/utils/process.py\n+++ b/IPython/utils/process.py\n@@ -23,7 +23,7 @@\n if sys.platform == 'win32':\n     from ._process_win32 import _find_cmd, system, getoutput, arg_split, check_pid\n elif sys.platform == 'cli':\n-    from ._process_cli import _find_cmd, system, getoutput, arg_split\n+    from ._process_cli import _find_cmd, system, getoutput, arg_split, check_pid\n else:\n     from ._process_posix import _find_cmd, system, getoutput, arg_split, check_pid\n", "issue": "Implement check_pid for .NET\nThis is a reminder - I added an `IPython.utils.process.check_pid` function to check if a process exists with a given PID. However, we have a `_process_cli` module containing .NET implementations of these things, and I didn't write the check_pid implementation for .NET.\n\n", "before_files": [{"content": "# encoding: utf-8\n\"\"\"\nUtilities for working with external processes.\n\"\"\"\n\n#-----------------------------------------------------------------------------\n#  Copyright (C) 2008-2011  The IPython Development Team\n#\n#  Distributed under the terms of the BSD License.  The full license is in\n#  the file COPYING, distributed as part of this software.\n#-----------------------------------------------------------------------------\n\n#-----------------------------------------------------------------------------\n# Imports\n#-----------------------------------------------------------------------------\nfrom __future__ import print_function\n\n# Stdlib\nimport os\nimport sys\n\n# Our own\nif sys.platform == 'win32':\n    from ._process_win32 import _find_cmd, system, getoutput, arg_split, check_pid\nelif sys.platform == 'cli':\n    from ._process_cli import _find_cmd, system, getoutput, arg_split\nelse:\n    from ._process_posix import _find_cmd, system, getoutput, arg_split, check_pid\n\nfrom ._process_common import getoutputerror, get_output_error_code, process_handler\nfrom . import py3compat\n\n#-----------------------------------------------------------------------------\n# Code\n#-----------------------------------------------------------------------------\n\n\nclass FindCmdError(Exception):\n    pass\n\n\ndef find_cmd(cmd):\n    \"\"\"Find absolute path to executable cmd in a cross platform manner.\n\n    This function tries to determine the full path to a command line program\n    using `which` on Unix/Linux/OS X and `win32api` on Windows.  Most of the\n    time it will use the version that is first on the users `PATH`.\n\n    Warning, don't use this to find IPython command line programs as there\n    is a risk you will find the wrong one.  Instead find those using the\n    following code and looking for the application itself::\n\n        from IPython.utils.path import get_ipython_module_path\n        from IPython.utils.process import pycmd2argv\n        argv = pycmd2argv(get_ipython_module_path('IPython.terminal.ipapp'))\n\n    Parameters\n    ----------\n    cmd : str\n        The command line program to look for.\n    \"\"\"\n    try:\n        path = _find_cmd(cmd).rstrip()\n    except OSError:\n        raise FindCmdError('command could not be found: %s' % cmd)\n    # which returns empty if not found\n    if path == '':\n        raise FindCmdError('command could not be found: %s' % cmd)\n    return os.path.abspath(path)\n\n\ndef is_cmd_found(cmd):\n    \"\"\"Check whether executable `cmd` exists or not and return a bool.\"\"\"\n    try:\n        find_cmd(cmd)\n        return True\n    except FindCmdError:\n        return False\n\n\ndef pycmd2argv(cmd):\n    r\"\"\"Take the path of a python command and return a list (argv-style).\n\n    This only works on Python based command line programs and will find the\n    location of the ``python`` executable using ``sys.executable`` to make\n    sure the right version is used.\n\n    For a given path ``cmd``, this returns [cmd] if cmd's extension is .exe,\n    .com or .bat, and [, cmd] otherwise.\n\n    Parameters\n    ----------\n    cmd : string\n      The path of the command.\n\n    Returns\n    -------\n    argv-style list.\n    \"\"\"\n    ext = os.path.splitext(cmd)[1]\n    if ext in ['.exe', '.com', '.bat']:\n        return [cmd]\n    else:\n        return [sys.executable, cmd]\n\n\ndef abbrev_cwd():\n    \"\"\" Return abbreviated version of cwd, e.g. d:mydir \"\"\"\n    cwd = py3compat.getcwd().replace('\\\\','/')\n    drivepart = ''\n    tail = cwd\n    if sys.platform == 'win32':\n        if len(cwd) < 4:\n            return cwd\n        drivepart,tail = os.path.splitdrive(cwd)\n\n\n    parts = tail.split('/')\n    if len(parts) > 2:\n        tail = '/'.join(parts[-2:])\n\n    return (drivepart + (\n        cwd == '/' and '/' or tail))\n", "path": "IPython/utils/process.py"}, {"content": "\"\"\"cli-specific implementation of process utilities.\n\ncli - Common Language Infrastructure for IronPython. Code\n      can run on any operating system. Check os.name for os-\n      specific settings.\n\nThis file is only meant to be imported by process.py, not by end-users.\n\nThis file is largely untested. To become a full drop-in process\ninterface for IronPython will probably require you to help fill\nin the details. \n\"\"\"\n\n# Import cli libraries:\nimport clr\nimport System\n\n# Import Python libraries:\nimport os\n\n# Import IPython libraries:\nfrom IPython.utils import py3compat\nfrom ._process_common import arg_split\n\ndef _find_cmd(cmd):\n    \"\"\"Find the full path to a command using which.\"\"\"\n    paths = System.Environment.GetEnvironmentVariable(\"PATH\").Split(os.pathsep)\n    for path in paths:\n        filename = os.path.join(path, cmd)\n        if System.IO.File.Exists(filename):\n            return py3compat.bytes_to_str(filename)\n    raise OSError(\"command %r not found\" % cmd)\n\ndef system(cmd):\n    \"\"\"\n    system(cmd) should work in a cli environment on Mac OSX, Linux,\n    and Windows\n    \"\"\"\n    psi = System.Diagnostics.ProcessStartInfo(cmd)\n    psi.RedirectStandardOutput = True\n    psi.RedirectStandardError = True\n    psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal\n    psi.UseShellExecute = False\n    # Start up process:\n    reg = System.Diagnostics.Process.Start(psi)\n\ndef getoutput(cmd):\n    \"\"\"\n    getoutput(cmd) should work in a cli environment on Mac OSX, Linux,\n    and Windows\n    \"\"\"\n    psi = System.Diagnostics.ProcessStartInfo(cmd)\n    psi.RedirectStandardOutput = True\n    psi.RedirectStandardError = True\n    psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal\n    psi.UseShellExecute = False\n    # Start up process:\n    reg = System.Diagnostics.Process.Start(psi)\n    myOutput = reg.StandardOutput\n    output = myOutput.ReadToEnd()\n    myError = reg.StandardError\n    error = myError.ReadToEnd()\n    return output\n", "path": "IPython/utils/_process_cli.py"}], "after_files": [{"content": "# encoding: utf-8\n\"\"\"\nUtilities for working with external processes.\n\"\"\"\n\n#-----------------------------------------------------------------------------\n#  Copyright (C) 2008-2011  The IPython Development Team\n#\n#  Distributed under the terms of the BSD License.  The full license is in\n#  the file COPYING, distributed as part of this software.\n#-----------------------------------------------------------------------------\n\n#-----------------------------------------------------------------------------\n# Imports\n#-----------------------------------------------------------------------------\nfrom __future__ import print_function\n\n# Stdlib\nimport os\nimport sys\n\n# Our own\nif sys.platform == 'win32':\n    from ._process_win32 import _find_cmd, system, getoutput, arg_split, check_pid\nelif sys.platform == 'cli':\n    from ._process_cli import _find_cmd, system, getoutput, arg_split, check_pid\nelse:\n    from ._process_posix import _find_cmd, system, getoutput, arg_split, check_pid\n\nfrom ._process_common import getoutputerror, get_output_error_code, process_handler\nfrom . import py3compat\n\n#-----------------------------------------------------------------------------\n# Code\n#-----------------------------------------------------------------------------\n\n\nclass FindCmdError(Exception):\n    pass\n\n\ndef find_cmd(cmd):\n    \"\"\"Find absolute path to executable cmd in a cross platform manner.\n\n    This function tries to determine the full path to a command line program\n    using `which` on Unix/Linux/OS X and `win32api` on Windows.  Most of the\n    time it will use the version that is first on the users `PATH`.\n\n    Warning, don't use this to find IPython command line programs as there\n    is a risk you will find the wrong one.  Instead find those using the\n    following code and looking for the application itself::\n\n        from IPython.utils.path import get_ipython_module_path\n        from IPython.utils.process import pycmd2argv\n        argv = pycmd2argv(get_ipython_module_path('IPython.terminal.ipapp'))\n\n    Parameters\n    ----------\n    cmd : str\n        The command line program to look for.\n    \"\"\"\n    try:\n        path = _find_cmd(cmd).rstrip()\n    except OSError:\n        raise FindCmdError('command could not be found: %s' % cmd)\n    # which returns empty if not found\n    if path == '':\n        raise FindCmdError('command could not be found: %s' % cmd)\n    return os.path.abspath(path)\n\n\ndef is_cmd_found(cmd):\n    \"\"\"Check whether executable `cmd` exists or not and return a bool.\"\"\"\n    try:\n        find_cmd(cmd)\n        return True\n    except FindCmdError:\n        return False\n\n\ndef pycmd2argv(cmd):\n    r\"\"\"Take the path of a python command and return a list (argv-style).\n\n    This only works on Python based command line programs and will find the\n    location of the ``python`` executable using ``sys.executable`` to make\n    sure the right version is used.\n\n    For a given path ``cmd``, this returns [cmd] if cmd's extension is .exe,\n    .com or .bat, and [, cmd] otherwise.\n\n    Parameters\n    ----------\n    cmd : string\n      The path of the command.\n\n    Returns\n    -------\n    argv-style list.\n    \"\"\"\n    ext = os.path.splitext(cmd)[1]\n    if ext in ['.exe', '.com', '.bat']:\n        return [cmd]\n    else:\n        return [sys.executable, cmd]\n\n\ndef abbrev_cwd():\n    \"\"\" Return abbreviated version of cwd, e.g. d:mydir \"\"\"\n    cwd = py3compat.getcwd().replace('\\\\','/')\n    drivepart = ''\n    tail = cwd\n    if sys.platform == 'win32':\n        if len(cwd) < 4:\n            return cwd\n        drivepart,tail = os.path.splitdrive(cwd)\n\n\n    parts = tail.split('/')\n    if len(parts) > 2:\n        tail = '/'.join(parts[-2:])\n\n    return (drivepart + (\n        cwd == '/' and '/' or tail))\n", "path": "IPython/utils/process.py"}, {"content": "\"\"\"cli-specific implementation of process utilities.\n\ncli - Common Language Infrastructure for IronPython. Code\n      can run on any operating system. Check os.name for os-\n      specific settings.\n\nThis file is only meant to be imported by process.py, not by end-users.\n\nThis file is largely untested. To become a full drop-in process\ninterface for IronPython will probably require you to help fill\nin the details. \n\"\"\"\n\n# Import cli libraries:\nimport clr\nimport System\n\n# Import Python libraries:\nimport os\n\n# Import IPython libraries:\nfrom IPython.utils import py3compat\nfrom ._process_common import arg_split\n\ndef _find_cmd(cmd):\n    \"\"\"Find the full path to a command using which.\"\"\"\n    paths = System.Environment.GetEnvironmentVariable(\"PATH\").Split(os.pathsep)\n    for path in paths:\n        filename = os.path.join(path, cmd)\n        if System.IO.File.Exists(filename):\n            return py3compat.bytes_to_str(filename)\n    raise OSError(\"command %r not found\" % cmd)\n\ndef system(cmd):\n    \"\"\"\n    system(cmd) should work in a cli environment on Mac OSX, Linux,\n    and Windows\n    \"\"\"\n    psi = System.Diagnostics.ProcessStartInfo(cmd)\n    psi.RedirectStandardOutput = True\n    psi.RedirectStandardError = True\n    psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal\n    psi.UseShellExecute = False\n    # Start up process:\n    reg = System.Diagnostics.Process.Start(psi)\n\ndef getoutput(cmd):\n    \"\"\"\n    getoutput(cmd) should work in a cli environment on Mac OSX, Linux,\n    and Windows\n    \"\"\"\n    psi = System.Diagnostics.ProcessStartInfo(cmd)\n    psi.RedirectStandardOutput = True\n    psi.RedirectStandardError = True\n    psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal\n    psi.UseShellExecute = False\n    # Start up process:\n    reg = System.Diagnostics.Process.Start(psi)\n    myOutput = reg.StandardOutput\n    output = myOutput.ReadToEnd()\n    myError = reg.StandardError\n    error = myError.ReadToEnd()\n    return output\n\ndef check_pid(pid):\n    \"\"\"\n    Check if a process with the given PID (pid) exists\n    \"\"\"\n    try:\n        System.Diagnostics.Process.GetProcessById(pid)\n        # process with given pid is running\n        return True\n    except System.InvalidOperationException:\n        # process wasn't started by this object (but is running)\n        return True\n    except System.ArgumentException:\n        # process with given pid isn't running\n        return False \n", "path": "IPython/utils/_process_cli.py"}]}