module Rinit::ProcessUtils
Public Instance Methods
get_pid_from_file(filename)
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@private
# File lib/rinit/process_utils.rb, line 29 def get_pid_from_file(filename) begin pid = IO.readlines(filename) rescue Errno::ENOENT => e puts e.message + "---Are you sure it is running?" exit 1 end # if the file is there but no pid was written to_i returns 0 pid.empty? ? -1 : pid[0].to_i end
is_process_running?(pidfile)
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@private
# File lib/rinit/process_utils.rb, line 41 def is_process_running?(pidfile) pid = get_pid_from_file(pidfile) ProcTable.ps{ |process| return true if process.pid == pid } false end
kill_process(pidfile)
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@private
# File lib/rinit/process_utils.rb, line 60 def kill_process(pidfile) pid = get_pid_from_file(pidfile) # should never be negative unless there is an issue with writing the pid return if pid < 0 begin Process.kill(9,pid) rescue Errno::ESRCH => e puts e.message puts "The pid file may not have been cleaned up properly." exit 1 end end
may_the_fork_be_with_you(command, pidfile)
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@private
# File lib/rinit/process_utils.rb, line 9 def may_the_fork_be_with_you(command, pidfile) rd, wr = IO.pipe pid = fork do rd.close begin exec(command) rescue SystemCallError wr.write('!') exit 1 end end wr.close command_result = if rd.eof? write_pidfile(pid, pidfile) else nil end end
pidfile_cleanup(pidfile)
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@private
# File lib/rinit/process_utils.rb, line 50 def pidfile_cleanup pidfile begin FileUtils.rm(pidfile) rescue Errno::ENOENT => e puts e.message exit 1 end end
write_pidfile(pid, pidfile)
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@private
# File lib/rinit/process_utils.rb, line 74 def write_pidfile(pid, pidfile) File.open(pidfile, 'w') { |f| f.write(pid) } end