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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright (c) 2015, Joyent, Inc. All rights reserved.
* Copyright 2021 OmniOS Community Edition (OmniOSce) Association.
*/
#include <sys/eventfd.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
int
eventfd(unsigned int initval, int flags)
{
int oflags = O_RDWR;
uint64_t val = initval;
int fd;
if (flags & ~(EFD_NONBLOCK | EFD_CLOEXEC | EFD_SEMAPHORE)) {
errno = EINVAL;
return (-1);
}
if (flags & EFD_NONBLOCK)
oflags |= O_NONBLOCK;
if (flags & EFD_CLOEXEC)
oflags |= O_CLOEXEC;
if ((fd = open("/dev/eventfd", oflags)) < 0)
return (-1);
if ((flags & EFD_SEMAPHORE) &&
ioctl(fd, EVENTFDIOC_SEMAPHORE, 0) != 0) {
(void) close(fd);
return (-1);
}
if (write(fd, &val, sizeof (val)) < sizeof (val)) {
(void) close(fd);
return (-1);
}
return (fd);
}
int
eventfd_read(int fd, eventfd_t *valp)
{
ssize_t ret = read(fd, valp, sizeof (*valp));
if (ret == -1 || (size_t)ret < sizeof (*valp))
return (-1);
return (0);
}
int
eventfd_write(int fd, eventfd_t val)
{
ssize_t ret = write(fd, &val, sizeof (val));
if (ret == -1 || (size_t)ret < sizeof (val))
return (-1);
return (0);
}
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