1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 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 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_ERR_H_ 32 #define _LINUX_ERR_H_ 33 34 #include <linux/compiler.h> 35 36 #define MAX_ERRNO 4095 37 38 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) 39 40 static inline void * 41 ERR_PTR(long error) 42 { 43 return (void *)error; 44 } 45 46 static inline long 47 PTR_ERR(const void *ptr) 48 { 49 return (long)ptr; 50 } 51 52 static inline long 53 IS_ERR(const void *ptr) 54 { 55 return IS_ERR_VALUE((unsigned long)ptr); 56 } 57 58 static inline long 59 IS_ERR_OR_NULL(const void *ptr) 60 { 61 return !ptr || IS_ERR_VALUE((unsigned long)ptr); 62 } 63 64 static inline void * 65 ERR_CAST(void *ptr) 66 { 67 return (void *)ptr; 68 } 69 70 static inline int 71 PTR_ERR_OR_ZERO(const void *ptr) 72 { 73 if (IS_ERR(ptr)) 74 return PTR_ERR(ptr); 75 else 76 return 0; 77 } 78 79 #define PTR_RET(p) PTR_ERR_OR_ZERO(p) 80 81 #endif /* _LINUX_ERR_H_ */ 82