About loading C libraries (again)

About loading C libraries (again)

[Jairo A. del Rio]

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Hi. I've just read in the LuaMetaTeX manual that --permitloadlib allows
loading compiled (.so/.dll) libraries. However, when I try it using ConTeXt
I have an error message (example below):

%hello.tex

\starttext

\startluacode

local hello = require"hellolib" -- hellolib.so

context(hello.helloworld())

\stopluacode

\stoptext

%hello.c
#include <lua.h>
#include <lauxlib.h>

static int helloworld (lua_State *L) {
    char hello[] = "Hello world!";
    lua_pushstring(L, hello);
    return 1;
}

static const struct luaL_Reg hellolib [] = {
      {"helloworld", helloworld},
      {NULL, NULL}
    };

int luaopen_hellolib (lua_State *L){
    luaL_newlib(L, hellolib);
    return 1;
}

error (lua loadlib): you can only load external libraries when
--permitloadlib is given


On the other hand, manually calling LuaMetaTeX with the ConTeXt format and
--permitloadlib gives the expected result (in this case, a "Hello world!").

How is the correct way to load those libraries? Thank you very much and
sorry if my question seems to be weird.

Best regards,

Jairo :)

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Re: About loading C libraries (again)

[Hans Hagen]

On 11/4/2020 11:01 AM, Jairo A. del Rio wrote:
> Hi. I've just read in the LuaMetaTeX manual that --permitloadlib allows 
> loading compiled (.so/.dll) libraries. However, when I try it using 
> ConTeXt I have an error message (example below):
> 
> %hello.tex
> 
> \starttext
> 
> \startluacode
> 
> local hello = require"hellolib" -- hellolib.so
> 
> context(hello.helloworld())
> 
> \stopluacode
> 
> \stoptext
> 
> %hello.c
> #include <lua.h>
> #include <lauxlib.h>
> 
> static int helloworld (lua_State *L) {
>      char hello[] = "Hello world!";
>      lua_pushstring(L, hello);
>      return 1;
> }
> 
> static const struct luaL_Reg hellolib [] = {
>        {"helloworld", helloworld},
>        {NULL, NULL}
>      };
> 
> int luaopen_hellolib (lua_State *L){
>      luaL_newlib(L, hellolib);
>      return 1;
> }
> 
> 
> error (lua loadlib): you can only load external libraries when 
> --permitloadlib is given
> 
> 
> On the other hand, manually calling LuaMetaTeX with the ConTeXt format 
> and --permitloadlib gives the expected result (in this case, a "Hello 
> world!").
> 
> How is the correct way to load those libraries? Thank you very much and 
> sorry if my question seems to be weird.
i should add a --permitloadlib option to the context runner then

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: About loading C libraries (again)

[Jairo A. del Rio]

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Hi again. I grepped the new release and I see permitloadlib is already
included in mtxrun. Just out of curiosity, is --permitloadlib called via
context or should I use it from mtxrun?
context --permitloadlib file.tex still doesn't have any effect.

Best wishes,

Jairo :)

El mié., 4 de nov. de 2020 a la(s) 06:44, Hans Hagen (j.hagen@xs4all.nl)
escribió:

> On 11/4/2020 11:01 AM, Jairo A. del Rio wrote:
> > Hi. I've just read in the LuaMetaTeX manual that --permitloadlib allows
> > loading compiled (.so/.dll) libraries. However, when I try it using
> > ConTeXt I have an error message (example below):
> >
> > %hello.tex
> >
> > \starttext
> >
> > \startluacode
> >
> > local hello = require"hellolib" -- hellolib.so
> >
> > context(hello.helloworld())
> >
> > \stopluacode
> >
> > \stoptext
> >
> > %hello.c
> > #include <lua.h>
> > #include <lauxlib.h>
> >
> > static int helloworld (lua_State *L) {
> >      char hello[] = "Hello world!";
> >      lua_pushstring(L, hello);
> >      return 1;
> > }
> >
> > static const struct luaL_Reg hellolib [] = {
> >        {"helloworld", helloworld},
> >        {NULL, NULL}
> >      };
> >
> > int luaopen_hellolib (lua_State *L){
> >      luaL_newlib(L, hellolib);
> >      return 1;
> > }
> >
> >
> > error (lua loadlib): you can only load external libraries when
> > --permitloadlib is given
> >
> >
> > On the other hand, manually calling LuaMetaTeX with the ConTeXt format
> > and --permitloadlib gives the expected result (in this case, a "Hello
> > world!").
> >
> > How is the correct way to load those libraries? Thank you very much and
> > sorry if my question seems to be weird.
> i should add a --permitloadlib option to the context runner then
>
> Hans
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
>

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Re: About loading C libraries (again)

[Hans Hagen]

On 11/5/2020 3:42 AM, Jairo A. del Rio wrote:
> Hi again. I grepped the new release and I see permitloadlib is already 
> included in mtxrun. Just out of curiosity, is --permitloadlib called via 
> context or should I use it from mtxrun?
> context --permitloadlib file.tex still doesn't have any effect.
It does here (not that i have a lib to test) so maybe check your path:

.../tex-context/tex/texmf-win64/bin/lib/luametatex/foo/libfoo.dll

(put the file there and run mtxrun --generate)

The lua versions should match and there shopuld be the initialer function.

\enabletrackers[*lib*]

gives some info.

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : https://bitbucket.org/phg/context-mirror/commits/
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___________________________________________________________________________________