Re: How to detect whether a process is running, on Linux, in the manner of 'pidof'?
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- Subject: Re: How to detect whether a process is running, on Linux, in the manner of 'pidof'?
- From: Jeff Pohlmeyer <yetanothergeek@...>
- Date: Thu, 8 Apr 2021 23:42:25 -0500
I don't think kill() is going to help you, it requires a PID
as its argument, if you knew the PID, you would be done.
Here are two examples using the information in /proc:
pidof_cmd() compares the first argument /proc/{PID}/cmdline
pidof_exe() compares the link referenced by /proc/{PID}/exe
Both return a table of all PIDs matching the search criteria.
Not heavily tested, probably not a one-size-fits-all solution, but maybe
good enough depending on your use case.
#!/usr/bin/env lua
local posix=require 'posix'
local glob = posix.glob
function pidof_cmd(cmd)
local pids={}
for _, p in pairs(glob('/proc/[0-9]*/cmdline', 0)) do
local f=io.open(p)
if f then
local s=f:read('*a')
if s and #s>0 then
s=s:gsub('0円.*$','')
if s==cmd then
table.insert(pids,(p:gsub('^/proc/(%d+)/.*$', '%1')))
end
end
end
end
return pids
end
function pidof_exe(exe)
local pids={}
for _, p in pairs(glob('/proc/[0-9]*/exe', 0)) do
local s=posix.readlink(p)
if s==exe then
table.insert(pids,(p:gsub('^/proc/(%d+)/.*$', '%1')))
end
end
return pids
end
local cmd=arg[1]
local pidlist=pidof_exe(cmd)
for i,pid in ipairs(pidlist) do
print(pid)
end
-- Jeff
- References:
- How to detect whether a process is running, on Linux, in the manner of 'pidof'?, Nicholas Joll
- Re: How to detect whether a process is running, on Linux, in the manner of 'pidof'?, Javier Guerra Giraldez
- Re: How to detect whether a process is running, on Linux, in the manner of 'pidof'?, Adrian Perez de Castro
- Re: How to detect whether a process is running, on Linux, in the manner of 'pidof'?, Nicholas Joll