1  /*
       2   * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@strace.io>
       3   * Copyright (c) 2014-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: GPL-2.0-or-later
       7   */
       8  
       9  #include "tests.h"
      10  
      11  #if defined(HAVE_PREADV) && defined(HAVE_PWRITEV)
      12  
      13  # include <fcntl.h>
      14  # include <unistd.h>
      15  # include <sys/uio.h>
      16  # include <assert.h>
      17  
      18  int
      19  main(void)
      20  {
      21  	const off_t offset = 0xdefaceddeadbeefLL;
      22  	char buf[4];
      23  	struct iovec iov = { buf, sizeof(buf) };
      24  
      25  	(void) close(0);
      26  	assert(open("/dev/zero", O_RDONLY) == 0);
      27  	assert(pread(0, buf, sizeof(buf), offset) == 4);
      28  	assert(preadv(0, &iov, 1, offset) == 4);
      29  	assert(!close(0));
      30  
      31  	assert(open("/dev/null", O_WRONLY) == 0);
      32  	assert(pwrite(0, buf, sizeof(buf), offset) == 4);
      33  	assert(pwritev(0, &iov, 1, offset) == 4);
      34  	assert(!close(0));
      35  
      36  	return 0;
      37  }
      38  
      39  #else
      40  
      41  SKIP_MAIN_UNDEFINED("HAVE_PREADV && HAVE_PWRITEV")
      42  
      43  #endif