liblttng-ust/error.h

   1 #ifndef _LTTNG_ERROR_H
   2 #define _LTTNG_ERROR_H
   3
   4 /*
   5  * Copyright (c) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; only
  10  * version 2.1 of the License.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <urcu/compiler.h>
  23 #include <unistd.h>
  24
  25 #define MAX_ERRNO       4095
  26
  27 static inline
  28 int IS_ERR_VALUE(long value)
  29 {
  30         if (caa_unlikely((unsigned long) value >= (unsigned long) -MAX_ERRNO))
  31                 return 1;
  32         else
  33                 return 0;
  34 }
  35
  36 static inline
  37 void *ERR_PTR(long error)
  38 {
  39         return (void *) error;
  40 }
  41
  42 static inline
  43 long PTR_ERR(const void *ptr)
  44 {
  45         return (long) ptr;
  46 }
  47
  48 static inline
  49 int IS_ERR(const void *ptr)
  50 {
  51         return IS_ERR_VALUE((long) ptr);
  52 }
  53
  54 #endif /* _LTTNG_ERROR_H */