我是PERL XS的新手,对调用用Ansi C编写的共享库(.so)有疑问。我似乎找不到任何好的例子来说明如何做到这一点。我通过教程开始(Hello World和所有这些)位于此处:
http://www.lemoda.net/xs/perlxstut/
我想修改它以在C共享库中调用名为cpro_supported的函数。
libpmap.so:
extern int cpro_supported(int);
以下是一些基础知识:
Makefile.PL:
use 5.008005;
use ExtUtils::MakeMaker;
# See lib/ExtUtils/MakeMaker.pm for details of how to influence
# the contents of the Makefile that is written.
WriteMakefile(
NAME => 'test',
VERSION_FROM => 'lib/test.pm', # finds $VERSION
PREREQ_PM => {}, # e.g., Module::Name => 1.1
($] >= 5.005 ? ## Add these new keywords supported since 5.005
(ABSTRACT_FROM => 'lib/test.pm', # retrieve abstract from module
AUTHOR => 'A. U. Thor <johnm@localdomain>') : ()),
LIBS => ['-lm'], # e.g., '-lm'
DEFINE => '', # e.g., '-DHAVE_SOMETHING'
INC => '-I.', # e.g., '-I. -I/usr/include/other'
# Un-comment this if you add C files to link with later:
#OBJECT => '$(O_FILES)' # link all the C files too
);
使用'-L path to .so file'修改了LIBS parm,但这似乎没什么帮助。
test.xs:
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "ppport.h"
MODULE = test PACKAGE = test
int
cpro_it(monitor)
int monitor
CODE:
RETVAL = cpro_supported(monitor);
OUTPUT:
RETVAL
void hello()
CODE:
printf("Hello, World!\n");
int
is_even(input)
int input
CODE:
RETVAL = (input % 2 == 0);
OUTPUT:
RETVAL
void
round(arg)
double arg
CODE:
if (arg > 0.0) {
arg = floor(arg + 0.5);
} else if (arg < 0.0) {
arg = ceil(arg - 0.5);
} else {
arg = 0.0;
}
OUTPUT:
arg
test.t:
# Before `make install' is performed this script should be runnable with
# `make test'. After `make install' it should work as `perl test.t'
#########################
# change 'tests => 1' to 'tests => last_test_to_print';
use Test::More tests => 10;
use test;
BEGIN { use_ok('test') };
#########################
# Insert your test code below, the Test::More module is use()ed here so read
# its man page ( perldoc Test::More ) for help writing this test script.
is (test::is_even(0), 1);
is (test::is_even(1), 0);
is (test::is_even(2), 1);
my $i;
$i = -1.5; test::round($i); is( $i, -2.0 );
$i = -1.1; test::round($i); is( $i, -1.0 );
$i = 0.0; test::round($i); is( $i, 0.0 );
$i = 0.5; test::round($i); is( $i, 1.0 );
$i = 1.2; test::round($i); is( $i, 1.0 );
my $mon;
$mon = test::cpro_it(23); is($mon,1);
当我运行make test时,我收到以下错误:
PERL_DL_NONLAZY = 1 / usr / bin / perl“-MExtUtils :: Command :: MM”“ - e”“test_harness(0,'blib / lib','blib / arch')”t / *。t 吨/测试....
无法加载'/home/johnm/tmp/test/blib/arch/auto/test/test.so'进行模块测试:/ home / johnm / tmp / test / blib / arch / auto / test / test.so:未定义的符号:cpro_supported在/usr/lib/perl5/5.8.5/i386-linux-thread-multi/DynaLoader.pm第230行。 at t / test.t第9行
在t / test.t第9行的require中编译失败。
BEGIN失败 - 编译在t / test.t第9行中止。 看起来你的测试在输出任何东西之前就已经死了。 吨/测试....可疑 测试返回状态255(wstat 65280,0xff00) 死了。失败测试1-10 10/10测试失败,0.00%没关系
t / test.t 255 65280 10 20 200.00%1-10 1/1测试脚本失败,0.00%没问题。 10/10分测试失败,0.00%没问题。
make: * [test_dynamic]错误2
关于这里缺少什么的任何想法?
THX !!
答案 0 :(得分:4)
您尚未告知它与包含cpro_supported
的库相关联。 (-L
选项只是告诉链接器它可以在哪里找到库;它实际上并没有告诉它链接与任何其他库。你需要一个-l
选项。)
MYEXTLIB
适用于作为模块构建过程一部分构建的C库,而不是系统上安装的库。试试这个:
LIBS => ['-L/home/johnm/lib -lpmap -lmap -llang -ldispatch -led -lm -lncurses'],
答案 1 :(得分:1)
看起来答案是将MYEXTLIB添加到Makefile.PL:
use 5.008005;
use ExtUtils::MakeMaker;
# See lib/ExtUtils/MakeMaker.pm for details of how to influence
# the contents of the Makefile that is written.
WriteMakefile(
NAME => 'test',
VERSION_FROM => 'lib/test.pm', # finds $VERSION
PREREQ_PM => {}, # e.g., Module::Name => 1.1
($] >= 5.005 ? ## Add these new keywords supported since 5.005
(ABSTRACT_FROM => 'lib/test.pm', # retrieve abstract from module
AUTHOR => 'A. U. Thor <johnm@localdomain>') : ()),
LIBS => ['-lm'], # e.g., '-lm'
DEFINE => '', # e.g., '-DHAVE_SOMETHING'
INC => '-I.', # e.g., '-I. -I/usr/include/other'
MYEXTLIB => '/home/johnm/lib/libpmap.so /home/johnm/lib/libmap.so /home/johnm/lib/liblang.so /home/johnm/lib/libdispatch.so /home/johnm/lib/libed.so',
# Un-comment this if you add C files to link with later:
#OBJECT => '$(O_FILES)' # link all the C files too
);
我能够通过以下错误解决原始问题:
undefined symbol: cpro_supported
但处理另一个错误:
/usr/include/curses.h:581:41: macro "instr" requires 2 arguments, but only 1 given make: *** [test.o] Error 1
我将以下内容添加到我的.xs文件中以删除以下消息但最终显示上述消息:
#include <curses.h>
Can't load '/home/johnm/tmp/test/blib/arch/auto/test/test.so' for module test: /home/johnm/dev/pmap-28-00/libso/bin/Linux/i686/libed.so: undefined symbol: stdscr at /usr/lib/perl5/5.8.5/i386-linux-thread-multi/DynaLoader.pm line 230.
这似乎引起了perl的麻烦......不确定这里发生了什么......
GOT IT !!
从.xs文件中删除#include并将-lncurses添加到LIBS parm并解决了curses问题..
LIBS => ['-lm -lncurses'], # e.g., '-lm'
我一直在服用cjm建议完成一个简单的c程序来调用cpro_supported来帮助构建Makefile.PM的参数。如果你问我这些参与者的文件很少而且很可怕:
http://metacpan.org/pod/ExtUtils::MakeMaker
这是一个缓慢而痛苦的过程.Argg !!!
UPDATE .....
完成所有工作,现在可以调用libpmap.so库中的cpro_supported()。 VICTORY !!!!
等待...由cjm推荐的改变,现在一切都很完美。请查看cjm的帖子。