1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2013 Roy Marples <roy (at) 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 } 64
