53 lines
1.9 KiB
C++
53 lines
1.9 KiB
C++
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * 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 COPYRIGHT HOLDERS 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
|
|
* COPYRIGHT OWNER 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.
|
|
*/
|
|
|
|
#include <sys/eventfd.h>
|
|
#include <unistd.h>
|
|
|
|
/* We duplicate the GLibc error semantics, which are poorly defined
|
|
* if the read() or write() does not return the proper number of bytes.
|
|
*/
|
|
int eventfd_read(int fd, eventfd_t *counter)
|
|
{
|
|
int ret = read(fd, counter, sizeof(*counter));
|
|
|
|
if (ret == sizeof(*counter))
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
int eventfd_write(int fd, eventfd_t counter)
|
|
{
|
|
int ret = write(fd, &counter, sizeof(counter));
|
|
|
|
if (ret == sizeof(counter))
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|