Quelle  snprintf_btf.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <linux/btf.h>
#include "netif_receive_skb.skel.h"

/* Demonstrate that bpf_snprintf_btf succeeds and that various data types
 * are formatted correctly.
 */
void serial_test_snprintf_btf(void)
{
 struct netif_receive_skb *skel;
 struct netif_receive_skb__bss *bss;
 int err, duration = 0;

 skel = netif_receive_skb__open();
 if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
  return;

 err = netif_receive_skb__load(skel);
 if (CHECK(err, "skel_load", "failed to load skeleton: %d\n", err))
  goto cleanup;

 bss = skel->bss;

 err = netif_receive_skb__attach(skel);
 if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
  goto cleanup;

 /* generate receive event */
 err = system("ping -c 1 127.0.0.1 > /dev/null");
 if (CHECK(err, "system", "ping failed: %d\n", err))
  goto cleanup;

 if (bss->skip) {
  printf("%s:SKIP:no __builtin_btf_type_id\n", __func__);
  test__skip();
  goto cleanup;
 }

 /*
 * Make sure netif_receive_skb program was triggered
 * and it set expected return values from bpf_trace_printk()s
 * and all tests ran.
 */
 if (!ASSERT_GT(bss->ret, 0, "bpf_snprintf_ret"))
  goto cleanup;

 if (CHECK(bss->ran_subtests == 0, "check if subtests ran",
    "no subtests ran, did BPF program run?"))
  goto cleanup;

 if (CHECK(bss->num_subtests != bss->ran_subtests,
    "check all subtests ran",
    "only ran %d of %d tests\n", bss->num_subtests,
    bss->ran_subtests))
  goto cleanup;

cleanup:
 netif_receive_skb__destroy(skel);
}