Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2013 Roy Marples <roy@marples.name> |
| 4 | * All rights reserved |
| 5 | |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <sys/time.h> |
| 29 | #include <sys/types.h> |
| 30 | |
| 31 | #include <limits.h> |
| 32 | #include <poll.h> |
| 33 | #include <signal.h> |
| 34 | #include <unistd.h> |
| 35 | |
| 36 | #include "pollts.h" |
| 37 | |
| 38 | #warning "This pollts(2) implementation is not entirely race condition safe." |
| 39 | #warning "Only operating system support for pollts(2) can correct this." |
| 40 | |
| 41 | int |
| 42 | pollts(struct pollfd *__restrict fds, nfds_t nfds, |
| 43 | const struct timespec *__restrict ts, const sigset_t *__restrict sigmask) |
| 44 | { |
| 45 | int r, timeout; |
| 46 | sigset_t oldset; |
| 47 | |
| 48 | if (ts == NULL) |
| 49 | timeout = -1; |
| 50 | else if (ts->tv_sec > INT_MAX / 1000 || |
| 51 | (ts->tv_sec == INT_MAX / 1000 && |
| 52 | (ts->tv_nsec + 999999) / 1000000 > INT_MAX % 1000000)) |
| 53 | timeout = INT_MAX; |
| 54 | else |
| 55 | timeout = ts->tv_sec * 1000 + (ts->tv_nsec + 999999) / 1000000; |
| 56 | if (sigmask && sigprocmask(SIG_SETMASK, sigmask, &oldset) == -1) |
| 57 | return -1; |
| 58 | r = poll(fds, nfds, timeout); |
| 59 | if (sigmask && sigprocmask(SIG_SETMASK, &oldset, NULL) == -1) |
| 60 | return -1; |
| 61 | |
| 62 | return r; |
| 63 | } |