load_program.c

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <gbpf.h>
#include <sys/ebpf_param.h>
#include <sys/xdp.h>
#include <sys/ebpf_probe.h>
#include <gbpf_driver.h>

struct my_data {
  int mymap;
  int myprog;
};

/*
 * Callback when the program found from the ELF file.
 * At this moment, the relocation for the maps are already
 * done. So, what we need is just load the program and
 * pick the file descriptor.
 */
void
on_prog(GBPFElfWalker *walker, const char *name,
        struct ebpf_inst *prog, uint32_t prog_len)
{
  struct my_data *data = (struct my_data *)walker->data;
  
  printf("Found program: %s\n", name);
  
  data->myprog = gbpf_load_prog(walker->driver, EBPF_PROG_TYPE_XXX,
                                prog, prog_len);
  assert(data->myprog != -1);
}

/*
 * Callback when the map found from the ELF file.
 * At this moment, the maps is already "created".
 * So, what we need to do is pick the file descriptor.
 */
void
on_map(GBPFElfWalker *walker, const char *name, int desc,
		   struct ebpf_map_def *map)
{
  struct my_data *data = (struct my_data *)walker->data;
  
  printf("Found map: %s\n", name);
  
  data->mymap = desc;
}

int
main(int argc, char **argv)
{
  int error;
  struct my_data data = {0};
  EBPFDevDriver *devDriver = ebpf_dev_driver_create();
  assert(devDriver != NULL);
  GBPFDriver *driver = &devDriver->base;
  
  
  GBPFElfWalker walker = {
    .driver = driver,
    .on_prog = on_prog,
    .on_map = on_map,
    .data = &data
  };

  error = gbpf_walk_elf(&walker, driver, argv[1]);
  assert(error == 0);
  
  gbpf_attach_probe(&driver, prog_desc, &ebpf, &xdp, "", &xdp_rx, &xdp, jit);
  gbpf_driver_destoy(driver);
  
  return EXIT_SUCCESS;
}