Sharing C functions between two XS Perl modues











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I have a Perl module A that is a XS based module. I have an A.xs file, and an aux_A.c file, where I have some standard C functions. I use DynaLoader, and it works file.



Now, I have a new module B, that is also a XS module. I also have the B.xs file, and the aux_B.c file. Now, I want that a standard C function defined in aux_B.c file to be able to use a function defined in aux_A.c file.



One option is to make A module to create a standard C library, and link B module with it. But I was trying to get away from that option.



Is there any other way to go?



What I am currently getting is DynaLoader complaining on undefined symbol when trying to load the B.so library.



Thanks
Alberto






c perl libraries xs







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    up vote
    2
    down vote

    favorite












    I have a Perl module A that is a XS based module. I have an A.xs file, and an aux_A.c file, where I have some standard C functions. I use DynaLoader, and it works file.



    Now, I have a new module B, that is also a XS module. I also have the B.xs file, and the aux_B.c file. Now, I want that a standard C function defined in aux_B.c file to be able to use a function defined in aux_A.c file.



    One option is to make A module to create a standard C library, and link B module with it. But I was trying to get away from that option.



    Is there any other way to go?



    What I am currently getting is DynaLoader complaining on undefined symbol when trying to load the B.so library.



    Thanks
    Alberto






    c perl libraries xs







    share|improve this question
























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      I have a Perl module A that is a XS based module. I have an A.xs file, and an aux_A.c file, where I have some standard C functions. I use DynaLoader, and it works file.



      Now, I have a new module B, that is also a XS module. I also have the B.xs file, and the aux_B.c file. Now, I want that a standard C function defined in aux_B.c file to be able to use a function defined in aux_A.c file.



      One option is to make A module to create a standard C library, and link B module with it. But I was trying to get away from that option.



      Is there any other way to go?



      What I am currently getting is DynaLoader complaining on undefined symbol when trying to load the B.so library.



      Thanks
      Alberto






      c perl libraries xs







      share|improve this question













      I have a Perl module A that is a XS based module. I have an A.xs file, and an aux_A.c file, where I have some standard C functions. I use DynaLoader, and it works file.



      Now, I have a new module B, that is also a XS module. I also have the B.xs file, and the aux_B.c file. Now, I want that a standard C function defined in aux_B.c file to be able to use a function defined in aux_A.c file.



      One option is to make A module to create a standard C library, and link B module with it. But I was trying to get away from that option.



      Is there any other way to go?



      What I am currently getting is DynaLoader complaining on undefined symbol when trying to load the B.so library.



      Thanks
      Alberto






      c perl libraries xs




      c perl libraries xs






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 10 at 12:20









      Alberto

      193117




      193117
























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          To make module A export its C symbols with DynaLoader, you have to add the following to A.pm:



          sub dl_load_flags { 1 }


          This is badly documented, unfortunately. See this thread on PerlMonks and the DynaLoadersource code for more details. The effect of the flag is to set RTLD_GLOBAL when loading A.so with dlopen which makes its symbols available to other shared objects.






          share|improve this answer























          • Thanks. I noticed this entry in the DynaLoader doc, but it wasn't clear. Thank you!
            – Alberto
            Nov 10 at 14:40











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          1 Answer
          1






          active

          oldest

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          active

          oldest

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          active

          oldest

          votes








          up vote
          4
          down vote



          accepted










          To make module A export its C symbols with DynaLoader, you have to add the following to A.pm:



          sub dl_load_flags { 1 }


          This is badly documented, unfortunately. See this thread on PerlMonks and the DynaLoadersource code for more details. The effect of the flag is to set RTLD_GLOBAL when loading A.so with dlopen which makes its symbols available to other shared objects.






          share|improve this answer























          • Thanks. I noticed this entry in the DynaLoader doc, but it wasn't clear. Thank you!
            – Alberto
            Nov 10 at 14:40















          up vote
          4
          down vote



          accepted










          To make module A export its C symbols with DynaLoader, you have to add the following to A.pm:



          sub dl_load_flags { 1 }


          This is badly documented, unfortunately. See this thread on PerlMonks and the DynaLoadersource code for more details. The effect of the flag is to set RTLD_GLOBAL when loading A.so with dlopen which makes its symbols available to other shared objects.






          share|improve this answer























          • Thanks. I noticed this entry in the DynaLoader doc, but it wasn't clear. Thank you!
            – Alberto
            Nov 10 at 14:40













          up vote
          4
          down vote



          accepted







          up vote
          4
          down vote



          accepted






          To make module A export its C symbols with DynaLoader, you have to add the following to A.pm:



          sub dl_load_flags { 1 }


          This is badly documented, unfortunately. See this thread on PerlMonks and the DynaLoadersource code for more details. The effect of the flag is to set RTLD_GLOBAL when loading A.so with dlopen which makes its symbols available to other shared objects.






          share|improve this answer














          To make module A export its C symbols with DynaLoader, you have to add the following to A.pm:



          sub dl_load_flags { 1 }


          This is badly documented, unfortunately. See this thread on PerlMonks and the DynaLoadersource code for more details. The effect of the flag is to set RTLD_GLOBAL when loading A.so with dlopen which makes its symbols available to other shared objects.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 10 at 16:33

























          answered Nov 10 at 13:19









          nwellnhof

          22.8k45779




          22.8k45779












          • Thanks. I noticed this entry in the DynaLoader doc, but it wasn't clear. Thank you!
            – Alberto
            Nov 10 at 14:40


















          • Thanks. I noticed this entry in the DynaLoader doc, but it wasn't clear. Thank you!
            – Alberto
            Nov 10 at 14:40
















          Thanks. I noticed this entry in the DynaLoader doc, but it wasn't clear. Thank you!
          – Alberto
          Nov 10 at 14:40




          Thanks. I noticed this entry in the DynaLoader doc, but it wasn't clear. Thank you!
          – Alberto
          Nov 10 at 14:40


















           

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