1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef _LINUX_ERR_H_ 30 #define _LINUX_ERR_H_ 31 32 #define MAX_ERRNO 4095 33 34 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO) 35 36 static inline void * 37 ERR_PTR(long error) 38 { 39 return (void *)error; 40 } 41 42 static inline long 43 PTR_ERR(const void *ptr) 44 { 45 return (long)ptr; 46 } 47 48 static inline long 49 IS_ERR(const void *ptr) 50 { 51 return IS_ERR_VALUE((unsigned long)ptr); 52 } 53 54 static inline long 55 IS_ERR_OR_NULL(const void *ptr) 56 { 57 return !ptr || IS_ERR_VALUE((unsigned long)ptr); 58 } 59 60 static inline void * 61 ERR_CAST(void *ptr) 62 { 63 return (void *)ptr; 64 } 65 66 #endif /* _LINUX_ERR_H_ */ 67