timerfd.c revision 6a72db4a7fa12c3e0d1c1cf91a07390739fa0fbf
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor/*
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * This file and its contents are supplied under the terms of the
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * Common Development and Distribution License ("CDDL"), version 1.0.
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * You may only use this file in accordance with the terms of version
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * 1.0 of the CDDL.
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor *
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * A full copy of the text of the CDDL should have accompanied this
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * source. A copy of the CDDL is also available via the Internet at
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * http://www.illumos.org/license/CDDL.
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor */
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor/*
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * Copyright (c) 2015, Joyent, Inc. All rights reserved.
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor */
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor#include <sys/timerfd.h>
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor#include <sys/stat.h>
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor#include <unistd.h>
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor#include <errno.h>
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor#include <fcntl.h>
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylorint
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylortimerfd_create(int clockid, int flags)
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor{
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor int oflags = O_RDWR;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor int fd;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if (flags & ~(TFD_NONBLOCK | TFD_CLOEXEC)) {
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor errno = EINVAL;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor return (-1);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor }
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if (flags & TFD_NONBLOCK)
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor oflags |= O_NONBLOCK;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if (flags & TFD_CLOEXEC)
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor oflags |= O_CLOEXEC;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if ((fd = open("/dev/timerfd", oflags)) < 0)
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor return (-1);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if (ioctl(fd, TIMERFDIOC_CREATE, clockid) != 0) {
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor (void) close(fd);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor return (-1);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor }
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor return (fd);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor}
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylorint
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylortimerfd_settime(int fd, int flags, const struct itimerspec *new_value,
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor struct itimerspec *old_value)
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor{
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor timerfd_settime_t st;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor int rval;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if (flags & ~(TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET)) {
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor errno = EINVAL;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor return (-1);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor }
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor st.tfd_settime_flags = flags;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor st.tfd_settime_value = (uint64_t)(uintptr_t)new_value;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor st.tfd_settime_ovalue = (uint64_t)(uintptr_t)old_value;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor rval = ioctl(fd, TIMERFDIOC_SETTIME, &st);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if (rval == -1 && errno == ENOTTY) {
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor /*
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * Linux has us return EINVAL when the file descriptor is valid
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * but is not a timerfd file descriptor -- and LTP explicitly
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * checks this case.
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor */
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor errno = EINVAL;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor }
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor return (rval);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor}
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylorint
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylortimerfd_gettime(int fd, struct itimerspec *curr_value)
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor{
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor int rval = ioctl(fd, TIMERFDIOC_GETTIME, curr_value);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor if (rval == -1 && errno == ENOTTY) {
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor /*
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor * See comment in timerfd_settime(), above.
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor */
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor errno = EINVAL;
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor }
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor return (rval);
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor}
9e39c5ba00a55fa05777cc94b148296af305e135Bill Taylor