1  /*
       2   * Check decoding of sethostname syscall.
       3   *
       4   * Copyright (c) 2016 Fei Jie <feij.fnst@cn.fujitsu.com>
       5   * Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
       6   * Copyright (c) 2016-2021 The strace developers.
       7   * All rights reserved.
       8   *
       9   * SPDX-License-Identifier: GPL-2.0-or-later
      10   */
      11  
      12  #include "tests.h"
      13  #include "scno.h"
      14  
      15  #include <stdio.h>
      16  #include <unistd.h>
      17  #include <linux/utsname.h>
      18  
      19  int
      20  main(void)
      21  {
      22  	kernel_ulong_t len;
      23  	long rc;
      24  
      25  	len = __NEW_UTS_LEN;
      26  	rc = syscall(__NR_sethostname, 0, len);
      27  	printf("sethostname(NULL, %u) = %s\n",
      28  	       (unsigned) len, sprintrc(rc));
      29  
      30  	if (F8ILL_KULONG_MASK) {
      31  		len |= F8ILL_KULONG_MASK;
      32  		rc = syscall(__NR_sethostname, 0, len);
      33  		printf("sethostname(NULL, %u) = %s\n",
      34  		       (unsigned) len, sprintrc(rc));
      35  	}
      36  
      37  	len = __NEW_UTS_LEN + 1;
      38  	void *const p = tail_alloc(len);
      39  	rc = syscall(__NR_sethostname, p, len);
      40  	printf("sethostname(%p, %u) = %s\n",
      41  	       p, (unsigned) len, sprintrc(rc));
      42  
      43  	puts("+++ exited with 0 +++");
      44  	return 0;
      45  }