FreeBSD/Linux Kernel Cross Reference
sys/sys/eventfd.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2020 Val Packett
      *
      * 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
     */
    
    #ifndef _SYS_EVENTFD_H_
    #define _SYS_EVENTFD_H_
    
    #include <sys/types.h>
    
    typedef uint64_t eventfd_t;
    
    #define EFD_SEMAPHORE   0x00000001
    #define EFD_NONBLOCK    0x00000004
    #define EFD_CLOEXEC     0x00100000
    
    #ifdef _KERNEL
    
    int eventfd_create_file(struct thread *td, struct file *fp, uint32_t initval,
        int flags);
    
    #else
    
    __BEGIN_DECLS
    int eventfd(unsigned int initval, int flags);
    int eventfd_read(int fd, eventfd_t *value);
    int eventfd_write(int fd, eventfd_t value);
    __END_DECLS
    
    #endif /* !_KERNEL */
    
    #endif /* !_SYS_EVENTFD_H_ */

Cache object: c71fc53c2382a25d3cf7e15ad0611142