Function rte_eal_config_attach

dpdk/lib/eal/linux/eal.c:262–298

attach to an existing shared memory config */

/* attach to an existing shared memory config */
static int
rte_eal_config_attach(void)
{
	struct rte_config *config = rte_eal_get_configuration();
	struct rte_mem_config *mem_config;
	const struct internal_config *internal_conf =
		eal_get_internal_configuration();

	const char *pathname = eal_runtime_config_path();

	if (internal_conf->no_shconf)
		return 0;

	if (mem_cfg_fd < 0){
		mem_cfg_fd = open(pathname, O_RDWR);
		if (mem_cfg_fd < 0) {
			RTE_LOG(ERR, EAL, "Cannot open '%s' for rte_mem_config\n",
				pathname);
			return -1;
		}
	}

	/* map it as read-only first */
	mem_config = (struct rte_mem_config *) mmap(NULL, sizeof(*mem_config),
			PROT_READ, MAP_SHARED, mem_cfg_fd, 0);
	if (mem_config == MAP_FAILED) {
		close(mem_cfg_fd);
		mem_cfg_fd = -1;
		RTE_LOG(ERR, EAL, "Cannot mmap memory for rte_config! error %i (%s)\n",
			errno, strerror(errno));
		return -1;
	}

	config->mem_config = mem_config;

	return 0;
}

/* reattach the shared config at exact memory location primary process has it */
static int