liblttng-ust/error.h

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _LTTNG_ERROR_H
   8 #define _LTTNG_ERROR_H
   9
  10 #include <urcu/compiler.h>
  11 #include <unistd.h>
  12
  13 #define MAX_ERRNO       4095
  14
  15 static inline
  16 int IS_ERR_VALUE(long value)
  17 {
  18         if (caa_unlikely((unsigned long) value >= (unsigned long) -MAX_ERRNO))
  19                 return 1;
  20         else
  21                 return 0;
  22 }
  23
  24 static inline
  25 void *ERR_PTR(long error)
  26 {
  27         return (void *) error;
  28 }
  29
  30 static inline
  31 long PTR_ERR(const void *ptr)
  32 {
  33         return (long) ptr;
  34 }
  35
  36 static inline
  37 int IS_ERR(const void *ptr)
  38 {
  39         return IS_ERR_VALUE((long) ptr);
  40 }
  41
  42 #endif /* _LTTNG_ERROR_H */