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require 'sys/proctable'
# The Sys module serves as a namespace only
module Sys
# The Top class serves as a toplevel name for the 'top' method.
class Top
# The version of the sys-top library
VERSION = '1.0.5'.freeze
# Returns an array of Struct::ProcTableStruct elements containing up
# to +num+ elements, sorted by +field+. The default number of elements
# is 10, while the default field is 'pctcpu'.
#
# Exception: the default sort field is 'pid' on AIX, Darwin and Windows.
#
def self.top(num = 10, field = 'pctcpu')
field = field.to_s if field.is_a?(Symbol)
aix = RbConfig::CONFIG['host_os'] =~ /aix/i
darwin = RbConfig::CONFIG['host_os'] =~ /darwin/i
dragonfly = RbConfig::CONFIG['host_os'] =~ /dragonfly/i
# Sort by pid on Windows and AIX by default
if (File::ALT_SEPARATOR || aix || darwin) && field == 'pctcpu'
field = 'pid'
end
if dragonfly && field == 'pctcpu'
Sys::ProcTable.ps.sort_by{ |obj| obj.lwp.pctcpu }[0..num-1]
else
Sys::ProcTable.ps.sort_by{ |obj| obj.send(field) || '' }[0..num-1]
end
end
end
end
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