1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Pawel Jakub Dawidek under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef _SIGTIMEDWAIT_H_ 31 #define _SIGTIMEDWAIT_H_ 32 33 #include <sys/types.h> 34 #include <sys/time.h> 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "pjdlog.h" 44 45 static int 46 sigtimedwait(const sigset_t *set, siginfo_t *info, 47 const struct timespec *timeout) 48 { 49 struct itimerval it; 50 sigset_t mask; 51 int error, signo; 52 53 PJDLOG_ASSERT(info == NULL); 54 55 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 56 PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0); 57 PJDLOG_VERIFY(sigprocmask(SIG_BLOCK, &mask, NULL) == 0); 58 59 timerclear(&it.it_interval); 60 it.it_value.tv_sec = timeout->tv_sec; 61 it.it_value.tv_usec = timeout->tv_nsec / 1000; 62 if (it.it_value.tv_sec == 0 && it.it_value.tv_usec == 0) 63 it.it_value.tv_usec = 1; 64 PJDLOG_VERIFY(setitimer(ITIMER_REAL, &it, NULL) == 0); 65 66 bcopy(set, &mask, sizeof(mask)); 67 PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0); 68 69 PJDLOG_VERIFY(sigwait(&mask, &signo) == 0); 70 error = errno; 71 72 timerclear(&it.it_interval); 73 timerclear(&it.it_value); 74 PJDLOG_VERIFY(setitimer(ITIMER_REAL, &it, NULL) == 0); 75 76 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 77 PJDLOG_VERIFY(sigaddset(&mask, SIGALRM) == 0); 78 PJDLOG_VERIFY(sigprocmask(SIG_UNBLOCK, &mask, NULL) == 0); 79 80 if (signo == SIGALRM) { 81 errno = EAGAIN; 82 signo = -1; 83 } else { 84 errno = error; 85 } 86 87 return (signo); 88 } 89 90 #endif /* !_SIGTIMEDWAIT_H_ */ 91