1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2016 François Tigeot 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef _LINUX_ERR_H_ 31 #define _LINUX_ERR_H_ 32 33 #define MAX_ERRNO 4095 34 35 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO) 36 37 static inline void * 38 ERR_PTR(long error) 39 { 40 return (void *)error; 41 } 42 43 static inline long 44 PTR_ERR(const void *ptr) 45 { 46 return (long)ptr; 47 } 48 49 static inline long 50 IS_ERR(const void *ptr) 51 { 52 return IS_ERR_VALUE((unsigned long)ptr); 53 } 54 55 static inline long 56 IS_ERR_OR_NULL(const void *ptr) 57 { 58 return !ptr || IS_ERR_VALUE((unsigned long)ptr); 59 } 60 61 static inline void * 62 ERR_CAST(void *ptr) 63 { 64 return (void *)ptr; 65 } 66 67 static inline int PTR_ERR_OR_ZERO( const void *ptr) 68 { 69 if (IS_ERR(ptr)) 70 return PTR_ERR(ptr); 71 72 return 0; 73 } 74 75 #endif /* _LINUX_ERR_H_ */ 76