FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/err.h

     /*-
      * Copyright (c) 2010 Isilon Systems, Inc.
      * Copyright (c) 2010 iX Systems, Inc.
      * Copyright (c) 2010 Panasas, Inc.
      * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    #ifndef _LINUXKPI_LINUX_ERR_H_
    #define _LINUXKPI_LINUX_ERR_H_
    
    #include <sys/types.h>
    
    #include <linux/compiler.h>
    
    #define MAX_ERRNO       4095
    
    #define IS_ERR_VALUE(x) unlikely((x) >= (uintptr_t)-MAX_ERRNO)
    
    static inline void *
    ERR_PTR(long error)
    {
            return (void *)(intptr_t)error;
    }
    
    static inline long
    PTR_ERR(const void *ptr)
    {
            return (intptr_t)ptr;
    }
    
    static inline bool
    IS_ERR(const void *ptr)
    {
            return IS_ERR_VALUE((uintptr_t)ptr);
    }
    
    static inline bool
    IS_ERR_OR_NULL(const void *ptr)
    {
            return !ptr || IS_ERR_VALUE((uintptr_t)ptr);
    }
    
    static inline void *
    ERR_CAST(const void *ptr)
    {
            return __DECONST(void *, ptr);
    }
    
    static inline int
    PTR_ERR_OR_ZERO(const void *ptr)
    {
            if (IS_ERR(ptr))
                    return PTR_ERR(ptr);
            else
                    return 0;
    }
    
    #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
    
    #endif  /* _LINUXKPI_LINUX_ERR_H_ */

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