我正在为Ruby模块构建一个简单的C扩展,当我在扩展中调用另一个C函数时,我遇到了段错误。基本的执行流程如下:
这是最后一次似乎打破的跳跃。我已经能够重现这个问题几乎没有任何功能,但函数调用。我有一个标准extconf.rb
,用直接Make编译它,并且在调用encrypt()
时会出现段错误。在运行时,我发出以下命令:
$ ruby extconf.rb $ make clean $ make $ ruby -r des -e 'puts DES.new.encrypt!'
输出:
creating Makefile /usr/bin/gcc-4.2 -I. -I/opt/local/lib/ruby/1.8/i686-darwin10 -I/opt/local/lib/ruby/1.8/i686-darwin10 -I. -I/opt/local/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -std=c99 -arch x86_64 -c calc.c /usr/bin/gcc-4.2 -I. -I/opt/local/lib/ruby/1.8/i686-darwin10 -I/opt/local/lib/ruby/1.8/i686-darwin10 -I. -I/opt/local/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -std=c99 -arch x86_64 -c deslib.c /usr/bin/gcc-4.2 -dynamic -bundle -undefined suppress -flat_namespace -o calc.bundle calc.o deslib.o -L. -L/opt/local/lib -L/opt/local/lib -L. -L/opt/local/lib -arch x86_64 -arch x86_64 -lruby -lpthread -ldl -lobjc About to do C encrypt... ./des.rb:42: [BUG] Segmentation fault ruby 1.8.7 (2011-02-18 patchlevel 334) [i686-darwin10] zsh: abort ruby -r des -e 'puts DES.new.encrypt!'
Ruby类:
class D
def encrypt!
self.encrypted = Calc.encrypt(0,0,0)
return self.encrypted
end
end
Calc模块:
#include "ruby.h"
#include "cryptlib.h"
VALUE Calc = Qnil;
void Init_calc();
VALUE method_encrypt(VALUE self, VALUE m, VALUE k, VALUE n);
void Init_calc() {
Calc = rb_define_module("Calc");
rb_define_method(Calc, "encrypt", method_encrypt, 3);
}
VALUE method_encrypt(VALUE self, VALUE m, VALUE k, VALUE n) {
uint64_t message = NUM2ULONG(m);
uint64_t key = NUM2ULONG(k);
int iters = NUM2INT(n);
printf("About to do C encrypt...\n");
uint64_t ciphertext = encrypt(message, key, iters);
printf("Done with C encrypt\n");
return ULONG2NUM(ciphertext);
}
cryptlib.h:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
uint64_t encrypt(uint64_t message, uint64_t key, int iters);
cryptlib.c:
#include "cryptlib.h"
uint64_t encrypt(uint64_t message, uint64_t key, int iters) {
return 0;
}
为什么这么糟糕?我在不到一小时前从MacPorts编译的MacBook Pro上运行ruby 1.8.7 (2011-02-18 patchlevel 334) [i686-darwin10]
。我的gcc --version
:
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)
答案 0 :(得分:0)
事实证明,encrypt
函数名称保留在Ruby C扩展库中更高的位置。重命名该功能,一切正常。