third_party/linux-syscall-support/tests/fallocate.c

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#include "test_skel.h"

int main(int argc, char *argv[]) {
  int fd = 0, mode = 0;
  loff_t offset = 0, len = 0;

  // Bad file descriptor.
  fd = -1;
  assert(sys_fallocate(fd, mode, offset, len) == -1);
  assert(errno == EBADF);

  char filename[] = "tempfile.XXXXXX";
  fd = mkstemp(filename);
  assert(fd >= 0);

  // Invalid len.
  assert(sys_fallocate(fd, mode, offset, len) == -1);
  assert(errno == EINVAL);

  // Small offset and length succeeds.
  len = 4096;
  assert(sys_fallocate(fd, mode, offset, len) == 0);

  // Large offset succeeds and isn't truncated.
  offset = 1llu + UINT32_MAX;
  assert(sys_fallocate(fd, mode , offset, len) == 0);

#if defined(__NR_fstat64)
  struct kernel_stat64 st;
  assert(sys_fstat64(fd, &st) == 0);
#else
  struct kernel_stat st;
  assert(sys_fstat(fd, &st) == 0);
#endif
  assert(st.st_size == offset + len);

  return 0;
}