root/tools/testing/selftests/bpf/prog_tests/signal_pending.c

DEFINITIONS

1. sigalrm_handler
2. test_signal_pending_by_type
3. test_signal_pending

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 
   4 static void sigalrm_handler(int s) {}
   5 static struct sigaction sigalrm_action = {
   6         .sa_handler = sigalrm_handler,
   7 };
   8 
   9 static void test_signal_pending_by_type(enum bpf_prog_type prog_type)
  10 {
  11         struct bpf_insn prog[4096];
  12         struct itimerval timeo = {
  13                 .it_value.tv_usec = 100000, /* 100ms */
  14         };
  15         __u32 duration = 0, retval;
  16         int prog_fd;
  17         int err;
  18         int i;
  19 
  20         for (i = 0; i < ARRAY_SIZE(prog); i++)
  21                 prog[i] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0);
  22         prog[ARRAY_SIZE(prog) - 1] = BPF_EXIT_INSN();
  23 
  24         prog_fd = bpf_load_program(prog_type, prog, ARRAY_SIZE(prog),
  25                                    "GPL", 0, NULL, 0);
  26         CHECK(prog_fd < 0, "test-run", "errno %d\n", errno);
  27 
  28         err = sigaction(SIGALRM, &sigalrm_action, NULL);
  29         CHECK(err, "test-run-signal-sigaction", "errno %d\n", errno);
  30 
  31         err = setitimer(ITIMER_REAL, &timeo, NULL);
  32         CHECK(err, "test-run-signal-timer", "errno %d\n", errno);
  33 
  34         err = bpf_prog_test_run(prog_fd, 0xffffffff, &pkt_v4, sizeof(pkt_v4),
  35                                 NULL, NULL, &retval, &duration);
  36         CHECK(duration > 500000000, /* 500ms */
  37               "test-run-signal-duration",
  38               "duration %dns > 500ms\n",
  39               duration);
  40 
  41         signal(SIGALRM, SIG_DFL);
  42 }
  43 
  44 void test_signal_pending(enum bpf_prog_type prog_type)
  45 {
  46         test_signal_pending_by_type(BPF_PROG_TYPE_SOCKET_FILTER);
  47         test_signal_pending_by_type(BPF_PROG_TYPE_FLOW_DISSECTOR);
  48 }