HawatelPS

Summary

HawatelPS (hawatel_ps) is a Ruby gem for retrieving information about running processes. It is easy to use, and you can get useful information about a process. You can terminate, suspend, resume and check the status of the process on Linux platform. On Windows platform, you can terminate and check the current status of the process.

On Linux platform, the HawatelPS collects all information from pseudo-file system /proc, and it is free from any gem dependencies.
On Windows platform the HawatelPS collects all information from WMI (Windows Management Instrumentation), and it is free from any gem dependencies.

Installation

Add this line to your application's Gemfile:

gem 'hawatel_ps'

And then execute:

$ bundle

Or install it yourself as:

$ gem install hawatel_ps

Example usage

Find process with specified PID

process = HawatelPS.search_by_pid(123)
p process.name if !process.nil?

Get list all running processes

processes = HawatelPS.proc_table

Find processes which matching a certain name

processes = HawatelPS.search_by_name('ruby')
processes.each do |process|
  p "PID: #{process.pid}"
end

Find processes where vmsize attribute is equal or greater than 2000 kb

processes = HawatelPS.search_by_condition(attr => 'vmsize', oper => '>=', value => '2000')
processes.each do |process|
  p process.pid
end

Suspend processes which name matching with regular expression

processes = HawatelPS.search_by_name('/^ruby/')
processes.each do |process|
  p process.suspend
end

Resume stopped processes

processes = HawatelPS.search_by_condition(attr => 'state', oper => '==', value => 'stopped')
processes.each do |process|
  p process.resume
end

Terminate processes which using more that 60% CPU

processes = HawatelPS.search_by_condition(attr => 'cpu_percent', oper => '>', value => '60')
processes.each do |process|
  p process.terminate
end

Process attributes

Linux

NOTE: In case lack of permission to retrieving specified information, the attribute should return a string with the message "Permission denied."

Attribute name	Description
cancelled_write_bytes	Cancelled write bytes.
childs	Childs of the process.
cmdline	Command line arguments.
cpu_percent	Average percent cpu usage since start.
cpu_time	Total cpu time.
ctime	Create process time.
cwd	Current working directory.
egid	Effective GID.
environ	Environment of the process.
euid	Effective UID.
exe	Filename of the executable.
fsgidl	File system GID.
fsuid	File system UID.
limits	Limits
listen_ports	List ports on which process listening.
memory_percent	Percent total memory usage by process.
open_files	List open files by process (exclude /proc & /dev).
pid	Process id.
ppid	Process id of the parent process.
rchar	Chars read.
read_bytes	Bytes read.
rgid	Real GID.
ruid	Real UID.
sgid	Saved set GID.
state	State of process (running, stopped, ….).
stime	Kernel mode jiffies.
suid	Saved set UID.
syscr	Read syscalls (numer of read I/O operations).
syscw	Write syscalls (numer of write I/O operations).
threads	Numer of threads.
tty	Controlling tty (terminal).
username	The user name of the owner of this process.
utime	User mode jiffies.
vmdata	Size of private data segments.
vmlib	Size of shared library code.
vmrss	Size of memory portions.
vmsize	Total program size.
vmswap	Amount of swap used by process.
wchar	Chars written.
write_bytes	Bytes written.

Windows

Attribute name	Description
availablevirtualsize	The free virtual address space available to this process.
caption	Short description of an process one-line string.
childs	Childs of the process.
commandline	Command line used to start a specific process, if applicable.
cpupercent	Average percent cpu usage since process start.
creationclassname	It is always Win32_Process
creationdate	Date the process begins executing.
cscreationclassname	It is always Win32_ComputerSystem.
csname	Name of the scoping computer system.
description	Description of a process.
domain	The domain name under which this process is running.
executablepath	Path to the executable file of the process.
executionstate	It is always nil.
handle	Process identifier.
handlecount	Total number of open handles owned by the process. HandleCount is the sum of the handles currently open by each thread in this process.
installdate	Date an object is installed. The object may be installed without a value being written to this property.
kernelmodetime	Time in kernel mode, in 100 nanosecond units. If this information is not available, use a value of 0 (zero)
maximumworkingsetsize	Maximum working set size of the process. The working set of a process is the set of memory pages visible to the process in physical RAM.
memorypercent	Average percent memory usage by the process (with shared memory, equivalent to WorkingSet in TaskManager)
minimumworkingsetsize	Minimum working set size of the process. The working set of a process is the set of memory pages visible to the process in physical RAM.
name	Name of the executable file responsible for the process, equivalent to the Image Name property in Task Manager.
oscreationclassname	It is always Win32_OperatingSystem.
osname	Name of the scoping operating system.
otheroperationcount	Number of I/O operations performed that are not read or write operations.
othertransfercount	Amount of data transferred during operations that are not read or write operations.
pagefaults	Number of page faults that a process generates.
pagefileusage	Amount of page file space that a process is using currently. This value is consistent with the VMSize value in TaskMgr.exe.
parentprocessid	Unique identifier of the process that creates a process.
peakpagefileusage	Maximum amount of page file space used during the life of a process.
peakvirtualsize	Maximum virtual address space a process uses at any one time. Using virtual address space does not necessarily imply corresponding use of either disk or main memory pages.
peakworkingsetsize	Peak working set size of a process.
priority	Scheduling priority of a process within an operating system.
privatepagecount	Current number of pages allocated that are only accessible to the process represented by this Win32_Process instance.
processid	Numeric identifier used to distinguish one process from another.
quotanonpagedpoolusage	Quota amount of nonpaged pool usage for a process.
quotapagedpoolusage	Quota amount of paged pool usage for a process.
quotapeaknonpagedpoolusage	Peak quota amount of nonpaged pool usage for a process.
quotapeakpagedpoolusage	Peak quota amount of paged pool usage for a process.
readoperationcount	Number of read operations performed.
readtransfercount	Amount of data read.
sessionid	Unique identifier that an operating system generates when a session is created. A session spans a period of time from logon until logoff from a specific system.
sid	The security identifier descriptor for the owner of this process.
status	State of a process ('running' or 'not running')
terminationdate	Process was stopped or terminated. To get the termination time, a handle to the process must be held open. Otherwise, this property returns NULL.
threadcount	Number of active threads in a process.
user	The user name of the owner of this process.
usermodetime	Time in user mode, in 100 nanosecond units. If this information is not available, use a value of 0 (zero).
virtualsize	Current size of the virtual address space that a process is using, not the physical or virtual memory actually used by the process.
windowsversion	Version of Windows in which the process is running.
wmi_object	Native WMI Object represented by the process.
workingsetsize	Amount of memory in bytes that a process needs to execute efficiently—for an operating system that uses page-based memory management.
writeoperationcount	Number of write operations performed.
writetransfercount	Amount of data written.

Contributing

See CONTRIBUTING

License

The gem is available as open source under the terms of the MIT License.