Re: [PATCH net-next v2 0/5] tools/net/ynl: Add support for nlctrl netlink family

On Wed, 6 Mar 2024 at 18:32, Jakub Kicinski [off-list ref] wrote:

Somewhat incredibly the C seems to work, I tested with this sample:

Wow, above and beyond for writing a sample. Was it ever in any doubt
that it would work ;-)

// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <string.h>

#include <ynl.h>

#include "nlctrl-user.h"

int main(int argc, char **argv)
{
        struct nlctrl_getfamily_list *fams;
        struct ynl_error yerr;
        struct ynl_sock *ys;
        char *name;

        ys = ynl_sock_create(&ynl_nlctrl_family, &yerr);
        if (!ys) {
                fprintf(stderr, "YNL: %s\n", yerr.msg);
                return 1;
        }

        printf("Select family ($name; or 0 = dump): ");
        scanf("%ms", &name);

        if (!name || !strcmp(name, "0")) {
                fams = nlctrl_getfamily_dump(ys);
                if (!fams)
                        goto err_close;

                ynl_dump_foreach(fams, f)
                        printf("%d: %s\n", f->family_id, f->family_name);
                nlctrl_getfamily_list_free(fams);
        } else {
                struct nlctrl_getfamily_req *req;
                struct nlctrl_getfamily_rsp *f;

                req = nlctrl_getfamily_req_alloc();
                nlctrl_getfamily_req_set_family_name(req, name);

                f = nlctrl_getfamily(ys, req);
                nlctrl_getfamily_req_free(req);
                if (!f)
                        goto err_close;

                printf("%d: %s\n", f->family_id, f->family_name);
                nlctrl_getfamily_rsp_free(f);
        }
        free(name);

        ynl_sock_destroy(ys);
        return 0;

err_close:
        fprintf(stderr, "YNL: %s\n", ys->err.msg);
        ynl_sock_destroy(ys);
        return 2;
}