1/* 2 * Copyright (C) 2013 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/poll.h> 30#include <sys/select.h> 31 32#include "private/bionic_time_conversions.h" 33#include "private/kernel_sigset_t.h" 34 35extern "C" int __ppoll(pollfd*, unsigned int, timespec*, const kernel_sigset_t*, size_t); 36extern "C" int __pselect6(int, fd_set*, fd_set*, fd_set*, timespec*, void*); 37 38int poll(pollfd* fds, nfds_t fd_count, int ms) { 39 timespec ts; 40 timespec* ts_ptr = NULL; 41 if (ms >= 0) { 42 timespec_from_ms(ts, ms); 43 ts_ptr = &ts; 44 } 45 return __ppoll(fds, fd_count, ts_ptr, NULL, 0); 46} 47 48int ppoll(pollfd* fds, nfds_t fd_count, const timespec* ts, const sigset_t* ss) { 49 timespec mutable_ts; 50 timespec* mutable_ts_ptr = NULL; 51 if (ts != NULL) { 52 mutable_ts = *ts; 53 mutable_ts_ptr = &mutable_ts; 54 } 55 56 kernel_sigset_t kernel_ss; 57 kernel_sigset_t* kernel_ss_ptr = NULL; 58 if (ss != NULL) { 59 kernel_ss.set(ss); 60 kernel_ss_ptr = &kernel_ss; 61 } 62 63 return __ppoll(fds, fd_count, mutable_ts_ptr, kernel_ss_ptr, sizeof(kernel_ss)); 64} 65 66int select(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, timeval* tv) { 67 timespec ts; 68 timespec* ts_ptr = NULL; 69 if (tv != NULL) { 70 if (!timespec_from_timeval(ts, *tv)) { 71 errno = EINVAL; 72 return -1; 73 } 74 ts_ptr = &ts; 75 } 76 int result = __pselect6(fd_count, read_fds, write_fds, error_fds, ts_ptr, NULL); 77 if (tv != NULL) { 78 timeval_from_timespec(*tv, ts); 79 } 80 return result; 81} 82 83int pselect(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, 84 const timespec* ts, const sigset_t* ss) { 85 timespec mutable_ts; 86 timespec* mutable_ts_ptr = NULL; 87 if (ts != NULL) { 88 mutable_ts = *ts; 89 mutable_ts_ptr = &mutable_ts; 90 } 91 92 kernel_sigset_t kernel_ss; 93 kernel_sigset_t* kernel_ss_ptr = NULL; 94 if (ss != NULL) { 95 kernel_ss.set(ss); 96 kernel_ss_ptr = &kernel_ss; 97 } 98 99 // The Linux kernel only handles 6 arguments and this system call really needs 7, 100 // so the last argument is a void* pointing to: 101 struct pselect6_extra_data_t { 102 uintptr_t ss_addr; 103 size_t ss_len; 104 }; 105 pselect6_extra_data_t extra_data; 106 extra_data.ss_addr = reinterpret_cast<uintptr_t>(kernel_ss_ptr); 107 extra_data.ss_len = sizeof(kernel_ss); 108 109 return __pselect6(fd_count, read_fds, write_fds, error_fds, mutable_ts_ptr, &extra_data); 110} 111