path: root/dso/unix/dso.c

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 */

#include "dso.h"
#include "apr_strings.h"
#include "apr_portable.h"

#if APR_HAS_DSO

#if !defined(DSO_USE_DLFCN) && !defined(DSO_USE_SHL) && !defined(DSO_USE_DYLD)
#error No DSO implementation specified.
#endif

#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h> /* malloc(), free() */
#endif
#if APR_HAVE_STRING_H
#include <string.h> /* for strerror() on HP-UX */
#endif

#ifdef NETWARE
#include <library.h>
#include <unistd.h>

static int setautounloadflag (const char *path);
#endif

APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso,
                                                apr_os_dso_handle_t osdso,
                                                apr_pool_t *pool)
{
    *aprdso = apr_pcalloc(pool, sizeof **aprdso);
    (*aprdso)->handle = osdso;
    (*aprdso)->pool = pool;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_os_dso_handle_get(apr_os_dso_handle_t *osdso,
                                                apr_dso_handle_t *aprdso)
{
    *osdso = aprdso->handle;
    return APR_SUCCESS;
}

static apr_status_t dso_cleanup(void *thedso)
{
    apr_dso_handle_t *dso = thedso;

    if (dso->handle == NULL)
        return APR_SUCCESS;

#if defined(DSO_USE_SHL)
    shl_unload((shl_t)dso->handle);
#elif defined(DSO_USE_DYLD)
    NSUnLinkModule(dso->handle, FALSE);
#elif defined(DSO_USE_DLFCN)
    if (dlclose(dso->handle) != 0)
        return APR_EINIT;
#endif
    dso->handle = NULL;

    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_dso_load(apr_dso_handle_t **res_handle, 
                                       const char *path, apr_pool_t *pool)
{
#if defined(DSO_USE_SHL)
    shl_t os_handle = shl_load(path, BIND_IMMEDIATE|BIND_VERBOSE|BIND_NOSTART, 0L);

#elif defined(DSO_USE_DYLD)
    NSObjectFileImage image;
    NSModule os_handle;
    char* err_msg = NULL;
    if (NSCreateObjectFileImageFromFile(path, &image) != NSObjectFileImageSuccess) {
	err_msg = "cannot create object file image";
    }
    else {
#ifdef NSLINKMODULE_OPTION_PRIVATE
      os_handle = NSLinkModule(image, path,
			       NSLINKMODULE_OPTION_PRIVATE |
			       NSLINKMODULE_OPTION_RETURN_ON_ERROR);
#else
      os_handle = NSLinkModule(image, path, TRUE);
#endif
    }

#elif defined(DSO_USE_DLFCN)
#if defined(OSF1) || defined(SEQUENT) || defined(SNI) ||\
    (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000))
    void *os_handle = dlopen((char *)path, RTLD_NOW | RTLD_GLOBAL);

#else
    void *os_handle = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
#endif    
#endif /* DSO_USE_x */

    *res_handle = apr_pcalloc(pool, sizeof(**res_handle));

    if(os_handle == NULL) {
#if defined(DSO_USE_SHL)
        (*res_handle)->errormsg = strerror(errno);
        return errno;
#elif defined(DSO_USE_DYLD)
        (*res_handle)->errormsg = (err_msg) ? err_msg : "link failed";
        return APR_EDSOOPEN;
#elif defined(DSO_USE_DLFCN)
        (*res_handle)->errormsg = dlerror();
        return APR_EDSOOPEN;
#endif
    }

    (*res_handle)->handle = (void*)os_handle;
    (*res_handle)->pool = pool;
    (*res_handle)->errormsg = NULL;

    apr_pool_cleanup_register(pool, *res_handle, dso_cleanup, apr_pool_cleanup_null);

#ifdef NETWARE
    setautounloadflag(path);
#endif

    return APR_SUCCESS;
}
    
APR_DECLARE(apr_status_t) apr_dso_unload(apr_dso_handle_t *handle)
{
    return apr_pool_cleanup_run(handle->pool, handle, dso_cleanup);
}

APR_DECLARE(apr_status_t) apr_dso_sym(apr_dso_handle_sym_t *ressym, 
                                      apr_dso_handle_t *handle, 
                                      const char *symname)
{
#if defined(DSO_USE_SHL)
    void *symaddr = NULL;
    int status;

    errno = 0;
    status = shl_findsym((shl_t *)&handle->handle, symname, TYPE_PROCEDURE, &symaddr);
    if (status == -1 && errno == 0) /* try TYPE_DATA instead */
        status = shl_findsym((shl_t *)&handle->handle, symname, TYPE_DATA, &symaddr);
    if (status == -1)
        return errno;
    *ressym = symaddr;
    return APR_SUCCESS;

#elif defined(DSO_USE_DYLD)
    void *retval = NULL;
    NSSymbol symbol;
    char *symname2 = (char*)malloc(sizeof(char)*(strlen(symname)+2));
    sprintf(symname2, "_%s", symname);
#ifdef NSLINKMODULE_OPTION_PRIVATE
    symbol = NSLookupSymbolInModule((NSModule)handle->handle, symname2);
#else
    symbol = NSLookupAndBindSymbol(symname2);
#endif
    free(symname2);
    if (symbol == NULL) {
        handle->errormsg = "undefined symbol";
	return APR_EINIT;
    }
    retval = NSAddressOfSymbol(symbol);
    if (retval == NULL) {
        handle->errormsg = "cannot resolve symbol";
	return APR_EINIT;
    }
    return APR_SUCCESS;
#elif defined(DSO_USE_DLFCN)

#if defined(DLSYM_NEEDS_UNDERSCORE)
    void *retval;
    char *symbol = (char*)malloc(sizeof(char)*(strlen(symname)+2));
    sprintf(symbol, "_%s", symname);
    retval = dlsym(handle->handle, symbol);
    free(symbol);
#elif defined(SEQUENT) || defined(SNI)
    void *retval = dlsym(handle->handle, (char *)symname);
#else
    void *retval = dlsym(handle->handle, symname);
#endif /* DLSYM_NEEDS_UNDERSCORE */

    if (retval == NULL) {
        handle->errormsg = dlerror();
        return APR_EINIT;
    }

    *ressym = retval;
    
    return APR_SUCCESS;
#endif /* DSO_USE_x */
}

APR_DECLARE(const char *) apr_dso_error(apr_dso_handle_t *dso, char *buffer, 
                                        apr_size_t buflen)
{
    if (dso->errormsg) {
        apr_cpystrn(buffer, dso->errormsg, buflen);
        return dso->errormsg;
    }
    return "No Error";
}

#ifdef NETWARE
static int setautounloadflag (const char *path)
{
    char name[256];

    deconstruct(path, NULL, NULL, NULL, name, NULL, NULL, PATH_UNDEF);
    SetAutoUnloadFlag(findnlmhandle(name, getaddressspace()));
}
#endif

#endif