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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Buffers;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.IO;
using System.Runtime.Versioning;
using System.Text;
using System.Threading;
namespace System.Diagnostics
{
public partial class Process : IDisposable
{
/// <summary>
/// Creates an array of <see cref="Process"/> components that are associated with process resources on a
/// remote computer. These process resources share the specified process name.
/// </summary>
[UnsupportedOSPlatform("ios")]
[UnsupportedOSPlatform("tvos")]
[SupportedOSPlatform("maccatalyst")]
public static Process[] GetProcessesByName(string? processName, string machineName)
{
ProcessManager.ThrowIfRemoteMachine(machineName);
processName ??= "";
ArrayBuilder<Process> processes = default;
foreach (int pid in ProcessManager.EnumerateProcessIds())
{
if (Interop.procfs.TryReadStatFile(pid, out Interop.procfs.ParsedStat parsedStat))
{
string actualProcessName = GetUntruncatedProcessName(ref parsedStat);
if ((processName == "" || string.Equals(processName, actualProcessName, StringComparison.OrdinalIgnoreCase)) &&
Interop.procfs.TryReadStatusFile(pid, out Interop.procfs.ParsedStatus parsedStatus))
{
ProcessInfo processInfo = ProcessManager.CreateProcessInfo(ref parsedStat, ref parsedStatus, actualProcessName);
processes.Add(new Process(machineName, isRemoteMachine: false, pid, processInfo));
}
}
}
return processes.ToArray();
}
/// <summary>Gets the amount of time the process has spent running code inside the operating system core.</summary>
[UnsupportedOSPlatform("ios")]
[UnsupportedOSPlatform("tvos")]
[SupportedOSPlatform("maccatalyst")]
public TimeSpan PrivilegedProcessorTime
{
get
{
return TicksToTimeSpan(GetStat().stime);
}
}
/// <summary>Gets the time the associated process was started.</summary>
internal DateTime StartTimeCore
{
get
{
return BootTimeToDateTime(TicksToTimeSpan(GetStat().starttime));
}
}
/// <summary>Computes a time based on a number of ticks since boot.</summary>
/// <param name="timespanAfterBoot">The timespan since boot.</param>
/// <returns>The converted time.</returns>
internal static DateTime BootTimeToDateTime(TimeSpan timespanAfterBoot)
{
// And use that to determine the absolute time for timespan.
DateTime dt = BootTime + timespanAfterBoot;
// The return value is expected to be in the local time zone.
// It is converted here (rather than starting with DateTime.Now) to avoid DST issues.
return dt.ToLocalTime();
}
private static long s_bootTimeTicks;
/// <summary>Gets the system boot time.</summary>
private static DateTime BootTime
{
get
{
long bootTimeTicks = Interlocked.Read(ref s_bootTimeTicks);
if (bootTimeTicks == 0)
{
bootTimeTicks = Interop.Sys.GetBootTimeTicks();
long oldValue = Interlocked.CompareExchange(ref s_bootTimeTicks, bootTimeTicks, 0);
if (oldValue != 0) // a different thread has managed to update the ticks first
{
bootTimeTicks = oldValue; // consistency
}
}
return new DateTime(bootTimeTicks);
}
}
/// <summary>Gets the parent process ID</summary>
private int ParentProcessId =>
GetStat().ppid;
/// <summary>Gets execution path</summary>
private static string? GetPathToOpenFile()
{
string[] allowedProgramsToRun = { "xdg-open", "gnome-open", "kfmclient" };
foreach (var program in allowedProgramsToRun)
{
string? pathToProgram = FindProgramInPath(program);
if (!string.IsNullOrEmpty(pathToProgram))
{
return pathToProgram;
}
}
return null;
}
/// <summary>
/// Gets the amount of time the associated process has spent utilizing the CPU.
/// It is the sum of the <see cref='System.Diagnostics.Process.UserProcessorTime'/> and
/// <see cref='System.Diagnostics.Process.PrivilegedProcessorTime'/>.
/// </summary>
[UnsupportedOSPlatform("ios")]
[UnsupportedOSPlatform("tvos")]
[SupportedOSPlatform("maccatalyst")]
public TimeSpan TotalProcessorTime
{
get
{
Interop.procfs.ParsedStat stat = GetStat();
return TicksToTimeSpan(stat.utime + stat.stime);
}
}
/// <summary>
/// Gets the amount of time the associated process has spent running code
/// inside the application portion of the process (not the operating system core).
/// </summary>
[UnsupportedOSPlatform("ios")]
[UnsupportedOSPlatform("tvos")]
[SupportedOSPlatform("maccatalyst")]
public TimeSpan UserProcessorTime
{
get
{
return TicksToTimeSpan(GetStat().utime);
}
}
partial void EnsureHandleCountPopulated()
{
if (_processInfo!.HandleCount <= 0 && _haveProcessId)
{
// Don't get information for a PID that exited and has possibly been recycled.
if (GetHasExited(refresh: false))
{
return;
}
string path = Interop.procfs.GetFileDescriptorDirectoryPathForProcess(_processId);
if (Directory.Exists(path))
{
try
{
_processInfo.HandleCount = Directory.GetFiles(path, "*", SearchOption.TopDirectoryOnly).Length;
}
catch (DirectoryNotFoundException) // Occurs when the process is deleted between the Exists check and the GetFiles call.
{
}
}
}
}
/// <summary>
/// Gets or sets which processors the threads in this process can be scheduled to run on.
/// </summary>
private IntPtr ProcessorAffinityCore
{
get
{
EnsureState(State.HaveNonExitedId);
IntPtr set;
if (Interop.Sys.SchedGetAffinity(_processId, out set) != 0)
{
throw new Win32Exception(); // match Windows exception
}
return set;
}
set
{
EnsureState(State.HaveNonExitedId);
if (Interop.Sys.SchedSetAffinity(_processId, ref value) != 0)
{
throw new Win32Exception(); // match Windows exception
}
}
}
/// <summary>
/// Make sure we have obtained the min and max working set limits.
/// </summary>
private void GetWorkingSetLimits(out IntPtr minWorkingSet, out IntPtr maxWorkingSet)
{
minWorkingSet = IntPtr.Zero; // no defined limit available
// For max working set, try to respect container limits by reading
// from cgroup, but if it's unavailable, fall back to reading from procfs.
EnsureState(State.HaveNonExitedId);
if (!Interop.cgroups.TryGetMemoryLimit(out ulong rsslim))
{
rsslim = GetStat().rsslim;
}
// rsslim is a ulong, but maxWorkingSet is an IntPtr, so we need to cap rsslim
// at the max size of IntPtr. This often happens when there is no configured
// rsslim other than ulong.MaxValue, which without these checks would show up
// as a maxWorkingSet == -1.
switch (IntPtr.Size)
{
case 4:
if (rsslim > int.MaxValue)
rsslim = int.MaxValue;
break;
case 8:
if (rsslim > long.MaxValue)
rsslim = long.MaxValue;
break;
}
maxWorkingSet = (IntPtr)rsslim;
}
/// <summary>Sets one or both of the minimum and maximum working set limits.</summary>
/// <param name="newMin">The new minimum working set limit, or null not to change it.</param>
/// <param name="newMax">The new maximum working set limit, or null not to change it.</param>
/// <param name="resultingMin">The resulting minimum working set limit after any changes applied.</param>
/// <param name="resultingMax">The resulting maximum working set limit after any changes applied.</param>
#pragma warning disable IDE0060
private static void SetWorkingSetLimitsCore(IntPtr? newMin, IntPtr? newMax, out IntPtr resultingMin, out IntPtr resultingMax)
{
// RLIMIT_RSS with setrlimit not supported on Linux > 2.4.30.
throw new PlatformNotSupportedException(SR.MinimumWorkingSetNotSupported);
}
#pragma warning restore IDE0060
/// <summary>Gets the path to the executable for the process, or null if it could not be retrieved.</summary>
/// <param name="processId">The pid for the target process, or -1 for the current process.</param>
internal static string? GetExePath(int processId = -1)
{
return processId == -1 ? Environment.ProcessPath :
Interop.Sys.ReadLink(Interop.procfs.GetExeFilePathForProcess(processId));
}
/// <summary>Gets the name that was used to start the process, or null if it could not be retrieved.</summary>
/// <param name="stat">The stat for the target process.</param>
internal static string GetUntruncatedProcessName(ref Interop.procfs.ParsedStat stat)
{
string cmdLineFilePath = Interop.procfs.GetCmdLinePathForProcess(stat.pid);
byte[]? rentedArray = null;
try
{
// bufferSize == 1 used to avoid unnecessary buffer in FileStream
using (var fs = new FileStream(cmdLineFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 1, useAsync: false))
{
Span<byte> buffer = stackalloc byte[512];
int bytesRead = 0;
while (true)
{
// Resize buffer if it was too small.
if (bytesRead == buffer.Length)
{
uint newLength = (uint)buffer.Length * 2;
byte[] tmp = ArrayPool<byte>.Shared.Rent((int)newLength);
buffer.CopyTo(tmp);
byte[]? toReturn = rentedArray;
buffer = rentedArray = tmp;
if (toReturn != null)
{
ArrayPool<byte>.Shared.Return(toReturn);
}
}
Debug.Assert(bytesRead < buffer.Length);
int n = fs.Read(buffer.Slice(bytesRead));
bytesRead += n;
// cmdline contains the argv array separated by '\0' bytes.
// stat.comm contains a possibly truncated version of the process name.
// When the program is a native executable, the process name will be in argv[0].
// When the program is a script, argv[0] contains the interpreter, and argv[1] contains the script name.
Span<byte> argRemainder = buffer.Slice(0, bytesRead);
int argEnd = argRemainder.IndexOf((byte)'\0');
if (argEnd != -1)
{
// Check if argv[0] has the process name.
string? name = GetUntruncatedNameFromArg(argRemainder.Slice(0, argEnd), prefix: stat.comm);
if (name != null)
{
return name;
}
// Check if argv[1] has the process name.
argRemainder = argRemainder.Slice(argEnd + 1);
argEnd = argRemainder.IndexOf((byte)'\0');
if (argEnd != -1)
{
name = GetUntruncatedNameFromArg(argRemainder.Slice(0, argEnd), prefix: stat.comm);
return name ?? stat.comm;
}
}
if (n == 0)
{
return stat.comm;
}
}
}
}
catch (IOException)
{
return stat.comm;
}
finally
{
if (rentedArray != null)
{
ArrayPool<byte>.Shared.Return(rentedArray);
}
}
static string? GetUntruncatedNameFromArg(Span<byte> arg, string prefix)
{
// Strip directory names from arg.
int nameStart = arg.LastIndexOf((byte)'/') + 1;
string argString = Encoding.UTF8.GetString(arg.Slice(nameStart));
if (argString.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
{
return argString;
}
else
{
return null;
}
}
}
// ----------------------------------
// ---- Unix PAL layer ends here ----
// ----------------------------------
/// <summary>Reads the stats information for this process from the procfs file system.</summary>
private Interop.procfs.ParsedStat GetStat()
{
EnsureState(State.HaveNonExitedId);
Interop.procfs.ParsedStat stat;
if (!Interop.procfs.TryReadStatFile(_processId, out stat))
{
throw new Win32Exception(SR.ProcessInformationUnavailable);
}
return stat;
}
}
}
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