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| | # -*- encoding: binary -*-
class Raindrops
module Linux
# The standard proc path for active UNIX domain sockets, feel free to call
# String#replace on this if your /proc is mounted in a non-standard location
# for whatever reason
PROC_NET_UNIX = "/proc/net/unix"
# Get ListenStats from an array of +paths+
#
# Socket state mapping from integer => symbol, based on socket_state
# enum from include/linux/net.h in the Linux kernel:
# typedef enum {
# SS_FREE = 0, /* not allocated */
# SS_UNCONNECTED, /* unconnected to any socket */
# SS_CONNECTING, /* in process of connecting */
# SS_CONNECTED, /* connected to socket */
# SS_DISCONNECTING /* in process of disconnecting */
# } socket_state;
# * SS_CONNECTING maps to ListenStats#active
# * SS_CONNECTED maps to ListenStats#queued
#
# This method may be significantly slower than its tcp_listener_stats
# counterpart due to the latter being able to use inet_diag via netlink.
# This parses /proc/net/unix as there is no other (known) way
# to expose Unix domain socket statistics over netlink.
def unix_listener_stats(paths)
rv = Hash.new { |h,k| h[k.freeze] = ListenStats.new(0, 0) }
paths = paths.map do |path|
path = path.dup
path.force_encoding(Encoding::BINARY) if defined?(Encoding)
rv[path]
Regexp.escape(path)
end
paths = / 00000000 \d+ (\d+)\s+\d+ (#{paths.join('|')})$/n
# no point in pread since we can't stat for size on this file
File.open(PROC_NET_UNIX, "rb") do |fp|
fp.read.scan(paths).each do |s|
path = s.last
case s.first.to_i
when 2 then rv[path].queued += 1
when 3 then rv[path].active += 1
end
end
end
rv
end
module_function :unix_listener_stats
end # Linux
end # Raindrops
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