omx_create_loaders_linux.c

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#define _GNU_SOURCE
#include <stdlib.h>
#include <dlfcn.h>
#include <string.h>
#include "component_loader.h"
#include "omx_create_loaders.h"
#include "omxcore.h"
#include "st_static_component_loader.h"

int 
createComponentLoaders()
{
    // load component loaders
    BOSA_COMPONENTLOADER *loader;
    void *handle;
    void *functionPointer;
    void (*fptr)(BOSA_COMPONENTLOADER *loader);
    char loaderFile[200];
    char *libraryFileName = NULL;
    FILE *loaderFP;
    size_t len = 0;
    int read;
    
    /* add the ST static component loader */
    st_static_InitComponentLoader();
    BOSA_AddComponentLoader(st_static_loader);
    
    // open file containing loader library names ($HOME/.omxloaders)
    DEBUG(DEB_LEV_FUNCTION_NAME, "In %s\n", __func__);
    memset(loaderFile, 0, sizeof(loaderFile));
    strcat(loaderFile, getenv("HOME"));
    strcat(loaderFile, "/.omxloaders");

    loaderFP = fopen(loaderFile, "r");
    if (loaderFP == NULL)
    {
        //DEBUG(DEB_LEV_ERR, "Could not open .omxloaders file\n");
        return -1;
    }
    
    // dlopen all loaders defined in .omxloaders file
    while((read = getline(&libraryFileName, &len, loaderFP)) != -1) 
    {
        // strip delimeter, the dlopen doesn't like it
        if(libraryFileName[read-1] == '\n')
            libraryFileName[read-1] = 0;
            
        handle = dlopen(libraryFileName, RTLD_NOW);
        
        if (!handle)
        {
            DEBUG(DEB_LEV_ERR, "library %s dlopen error: %s\n", libraryFileName, dlerror());
            exit(1);
        }

        if ((functionPointer = dlsym(handle, "setup_component_loader")) == NULL)
        {
                DEBUG(DEB_LEV_ERR, "the library %s is not compatible - %s\n", libraryFileName, dlerror());
                exit(1);
        }
        fptr = functionPointer;

        loader = (BOSA_COMPONENTLOADER *) calloc(1, sizeof(BOSA_COMPONENTLOADER));

        if (loader == NULL) 
        {
                DEBUG(DEB_LEV_ERR, "not enough memory for this loader\n");
                exit(1);
        }

        /* setup the function pointers */
        (*fptr)(loader);

        /* add loader to core */
        BOSA_AddComponentLoader(loader);
    }

    if (libraryFileName)
    {
        free(libraryFileName);
    }
    
    fclose(loaderFP);

    return 0;
}

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