1  /*
       2   * Copyright (c) 2015-2017 Dmitry V. Levin <ldv@strace.io>
       3   * Copyright (c) 2017-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: LGPL-2.1-or-later
       7   */
       8  
       9  #ifndef STRACE_NEGATED_ERRNO_H
      10  # define STRACE_NEGATED_ERRNO_H
      11  
      12  /*
      13   * Check the syscall return value register value for whether it is
      14   * a negated errno code indicating an error, or a success return value.
      15   */
      16  static inline bool
      17  is_negated_errno(kernel_ulong_t val)
      18  {
      19  	kernel_ulong_t max = -(kernel_long_t) MAX_ERRNO_VALUE;
      20  
      21  # ifndef current_klongsize
      22  	if (current_klongsize < sizeof(val)) {
      23  		val = (uint32_t) val;
      24  		max = (uint32_t) max;
      25  	}
      26  # endif /* !current_klongsize */
      27  
      28  	return val >= max;
      29  }
      30  
      31  #endif /* !STRACE_NEGATED_ERRNO_H */