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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2542 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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ttate 2002-06-10 18:23:39 +00:00
parent 5c1bdda10c
commit ceade7b926
3 changed files with 19 additions and 1 deletions

View file

@ -59,6 +59,18 @@ to wrap the given PtrData object which is, for example, created by DL::malloc().
DL::malloc() is a function to allocate a memory by using the C library function
malloc().
We can define a callback using the module function "callback" as follows:
module Foo
extend DL::Importable
def my_comp(str1,str2)
str1 <=> str2
end
COMPARE = callback "int my_comp(char*,char*)"
end
where Foo::COMPARE is a Symbol object which invokes the method "my_comp".
DL::Importable module is very useful. However, we sometimes encounter a case
that we must directly use low-level functions such as dlsym(). In such case,
we would use DL module functions. They are described in next section.

View file

@ -88,6 +88,7 @@ module DL
["long", "L", nil, nil, nil, nil],
["float", "F", nil, nil, nil, nil],
["double", "D", nil, nil, nil, nil],
[/char\s*\*/,"S",nil, nil, nil, nil],
[/.+\*/, "P", nil, nil, nil, nil],
[/.+\[\]/, "a", nil, nil, nil, nil],
["void", "0", nil, nil, nil, nil],

View file

@ -35,6 +35,11 @@ module LIBC
"int tz_minuteswest",
"int tz_dsttime",
]
def my_compare(ptr1, ptr2)
ptr1.ptr.to_s <=> ptr2.ptr.to_s
end
COMPARE = callback "int my_compare(char**, char**)"
end
@ -54,7 +59,7 @@ p LIBC.strcat("a", "b")
ary = ["a","c","b"]
ptr = ary.to_ptr
LIBC.qsort(ptr, ary.length, DL.sizeof('P'), $cb1)
LIBC.qsort(ptr, ary.length, DL.sizeof('P'), LIBC::COMPARE)
p ptr.to_a('S', ary.length)
tv = LIBC::Timeval.malloc