1*1767006bSBryan Cantrill /*
2*1767006bSBryan Cantrill * This file and its contents are supplied under the terms of the
3*1767006bSBryan Cantrill * Common Development and Distribution License ("CDDL"), version 1.0.
4*1767006bSBryan Cantrill * You may only use this file in accordance with the terms of version
5*1767006bSBryan Cantrill * 1.0 of the CDDL.
6*1767006bSBryan Cantrill *
7*1767006bSBryan Cantrill * A full copy of the text of the CDDL should have accompanied this
8*1767006bSBryan Cantrill * source. A copy of the CDDL is also available via the Internet at
9*1767006bSBryan Cantrill * http://www.illumos.org/license/CDDL.
10*1767006bSBryan Cantrill */
11*1767006bSBryan Cantrill
12*1767006bSBryan Cantrill /*
13*1767006bSBryan Cantrill * Copyright (c) 2015, Joyent, Inc. All rights reserved.
14*1767006bSBryan Cantrill */
15*1767006bSBryan Cantrill
16*1767006bSBryan Cantrill #include <sys/eventfd.h>
17*1767006bSBryan Cantrill #include <sys/stat.h>
18*1767006bSBryan Cantrill #include <unistd.h>
19*1767006bSBryan Cantrill #include <errno.h>
20*1767006bSBryan Cantrill #include <fcntl.h>
21*1767006bSBryan Cantrill
22*1767006bSBryan Cantrill int
eventfd(unsigned int initval,int flags)23*1767006bSBryan Cantrill eventfd(unsigned int initval, int flags)
24*1767006bSBryan Cantrill {
25*1767006bSBryan Cantrill int oflags = O_RDWR;
26*1767006bSBryan Cantrill uint64_t val = initval;
27*1767006bSBryan Cantrill int fd;
28*1767006bSBryan Cantrill
29*1767006bSBryan Cantrill if (flags & ~(EFD_NONBLOCK | EFD_CLOEXEC | EFD_SEMAPHORE)) {
30*1767006bSBryan Cantrill errno = EINVAL;
31*1767006bSBryan Cantrill return (-1);
32*1767006bSBryan Cantrill }
33*1767006bSBryan Cantrill
34*1767006bSBryan Cantrill if (flags & EFD_NONBLOCK)
35*1767006bSBryan Cantrill oflags |= O_NONBLOCK;
36*1767006bSBryan Cantrill
37*1767006bSBryan Cantrill if (flags & EFD_CLOEXEC)
38*1767006bSBryan Cantrill oflags |= O_CLOEXEC;
39*1767006bSBryan Cantrill
40*1767006bSBryan Cantrill if ((fd = open("/dev/eventfd", oflags)) < 0)
41*1767006bSBryan Cantrill return (-1);
42*1767006bSBryan Cantrill
43*1767006bSBryan Cantrill if ((flags & EFD_SEMAPHORE) &&
44*1767006bSBryan Cantrill ioctl(fd, EVENTFDIOC_SEMAPHORE, 0) != 0) {
45*1767006bSBryan Cantrill (void) close(fd);
46*1767006bSBryan Cantrill return (-1);
47*1767006bSBryan Cantrill }
48*1767006bSBryan Cantrill
49*1767006bSBryan Cantrill if (write(fd, &val, sizeof (val)) < sizeof (val)) {
50*1767006bSBryan Cantrill (void) close(fd);
51*1767006bSBryan Cantrill return (-1);
52*1767006bSBryan Cantrill }
53*1767006bSBryan Cantrill
54*1767006bSBryan Cantrill return (fd);
55*1767006bSBryan Cantrill }
56*1767006bSBryan Cantrill
57*1767006bSBryan Cantrill int
eventfd_read(int fd,eventfd_t * valp)58*1767006bSBryan Cantrill eventfd_read(int fd, eventfd_t *valp)
59*1767006bSBryan Cantrill {
60*1767006bSBryan Cantrill return (read(fd, valp, sizeof (*valp)) < sizeof (*valp) ? -1 : 0);
61*1767006bSBryan Cantrill }
62*1767006bSBryan Cantrill
63*1767006bSBryan Cantrill int
eventfd_write(int fd,eventfd_t val)64*1767006bSBryan Cantrill eventfd_write(int fd, eventfd_t val)
65*1767006bSBryan Cantrill {
66*1767006bSBryan Cantrill return (write(fd, &val, sizeof (val)) < sizeof (val) ? -1 : 0);
67*1767006bSBryan Cantrill }
68