Function TEST

fbclock/cpp_test/test.cpp:26–67

#include <iterator>
#include <thread>

#include "../fbclock.h"

TEST(fbclockTest, test_write_read) {
  int err;
  char* test_shm = std::tmpnam(nullptr);

  // open file, write data into it
  FILE* f = fopen(test_shm, "wb+");
  int sfd_rw = fileno(f);
  ASSERT_NE(sfd_rw, -1);

  err = ftruncate(sfd_rw, FBCLOCK_SHMDATA_SIZE);
  ASSERT_EQ(err, 0);

  fbclock_clockdata data = {
      .ingress_time_ns = 1, .error_bound_ns = 2, .holdover_multiplier_ns = 3};
  err = fbclock_clockdata_store_data(sfd_rw, &data);
  ASSERT_EQ(err, 0);

  fclose(f);

  // read data from the file
  f = fopen(test_shm, "r");
  int sfd_ro = fileno(f);
  ASSERT_NE(sfd_ro, -1);

  fbclock_shmdata* shmp = (fbclock_shmdata*)mmap(
      nullptr, FBCLOCK_SHMDATA_SIZE, PROT_READ, MAP_SHARED, sfd_ro, 0);
  ASSERT_NE(shmp, MAP_FAILED);

  fbclock_clockdata read_data;

  err = fbclock_clockdata_load_data(shmp, &read_data);
  ASSERT_EQ(err, 0);

  munmap(shmp, FBCLOCK_SHMDATA_SIZE);
  fclose(f);

  EXPECT_EQ(data.ingress_time_ns, read_data.ingress_time_ns);
  EXPECT_EQ(data.error_bound_ns, read_data.error_bound_ns);
  EXPECT_EQ(data.holdover_multiplier_ns, read_data.holdover_multiplier_ns);

  remove(test_shm);
}