/* * 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); }