/usr/lib/ruby/2.0.0/dl/callback.rb is in libruby2.0 2.0.0.484-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | require 'dl'
require 'thread'
module DL
# The mutual exclusion (Mutex) semaphore for the DL module
SEM = Mutex.new # :nodoc:
if DL.fiddle?
# A Hash of callback Procs
#
# Uses Fiddle
CdeclCallbackProcs = {} # :nodoc:
# A Hash of the addresses of callback Proc
#
# Uses Fiddle
CdeclCallbackAddrs = {} # :nodoc:
# A Hash of Stdcall callback Procs
#
# Uses Fiddle on win32
StdcallCallbackProcs = {} # :nodoc:
# A Hash of the addresses of Stdcall callback Procs
#
# Uses Fiddle on win32
StdcallCallbackAddrs = {} # :nodoc:
end
def set_callback_internal(proc_entry, addr_entry, argc, ty, abi = nil, &cbp)
if( argc < 0 )
raise(ArgumentError, "arity should not be less than 0.")
end
addr = nil
if DL.fiddle?
abi ||= Fiddle::Function::DEFAULT
closure = Fiddle::Closure::BlockCaller.new(ty, [TYPE_VOIDP] * argc, abi, &cbp)
proc_entry[closure.to_i] = closure
addr = closure.to_i
else
SEM.synchronize{
ary = proc_entry[ty]
(0...MAX_CALLBACK).each{|n|
idx = (n * DLSTACK_SIZE) + argc
if( ary[idx].nil? )
ary[idx] = cbp
addr = addr_entry[ty][idx]
break
end
}
}
end
addr
end
def set_cdecl_callback(ty, argc, &cbp)
set_callback_internal(CdeclCallbackProcs, CdeclCallbackAddrs, argc, ty, &cbp)
end
def set_stdcall_callback(ty, argc, &cbp)
if DL.fiddle?
set_callback_internal(StdcallCallbackProcs, StdcallCallbackAddrs, argc, ty, Fiddle::Function::STDCALL, &cbp)
else
set_callback_internal(StdcallCallbackProcs, StdcallCallbackAddrs, argc, ty, &cbp)
end
end
def remove_callback_internal(proc_entry, addr_entry, addr, ctype = nil)
if DL.fiddle?
addr = addr.to_i
return false unless proc_entry.key?(addr)
proc_entry.delete(addr)
true
else
index = nil
if( ctype )
addr_entry[ctype].each_with_index{|xaddr, idx|
if( xaddr == addr )
index = idx
end
}
else
addr_entry.each{|ty,entry|
entry.each_with_index{|xaddr, idx|
if( xaddr == addr )
index = idx
end
}
}
end
if( index and proc_entry[ctype][index] )
proc_entry[ctype][index] = nil
return true
else
return false
end
end
end
def remove_cdecl_callback(addr, ctype = nil)
remove_callback_internal(CdeclCallbackProcs, CdeclCallbackAddrs, addr, ctype)
end
def remove_stdcall_callback(addr, ctype = nil)
remove_callback_internal(StdcallCallbackProcs, StdcallCallbackAddrs, addr, ctype)
end
alias set_callback set_cdecl_callback
alias remove_callback remove_cdecl_callback
end
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