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 <errno.h> 30 #include <sys/poll.h> 31 #include <sys/select.h> 32 33 #include "private/bionic_time_conversions.h" 34 #include "private/sigrtmin.h" 35 #include "private/SigSetConverter.h" 36 37 extern "C" int __ppoll(pollfd*, unsigned int, timespec*, const sigset64_t*, size_t); 38 extern "C" int __pselect6(int, fd_set*, fd_set*, fd_set*, timespec*, void*); 39 40 int poll(pollfd* fds, nfds_t fd_count, int ms) { 41 timespec ts; 42 timespec* ts_ptr = nullptr; 43 if (ms >= 0) { 44 timespec_from_ms(ts, ms); 45 ts_ptr = &ts; 46 } 47 return __ppoll(fds, fd_count, ts_ptr, nullptr, 0); 48 } 49 50 int ppoll(pollfd* fds, nfds_t fd_count, const timespec* ts, const sigset_t* ss) { 51 // The underlying `__ppoll` system call only takes `sigset64_t`. 52 SigSetConverter set; 53 sigset64_t* ss_ptr = nullptr; 54 if (ss != nullptr) { 55 set = {}; 56 set.sigset = *ss; 57 ss_ptr = &set.sigset64; 58 } 59 return ppoll64(fds, fd_count, ts, ss_ptr); 60 } 61 62 int ppoll64(pollfd* fds, nfds_t fd_count, const timespec* ts, const sigset64_t* ss) { 63 // The underlying __ppoll system call modifies its `struct timespec` argument. 64 timespec mutable_ts; 65 timespec* mutable_ts_ptr = nullptr; 66 if (ts != nullptr) { 67 mutable_ts = *ts; 68 mutable_ts_ptr = &mutable_ts; 69 } 70 71 sigset64_t mutable_ss; 72 sigset64_t* mutable_ss_ptr = nullptr; 73 if (ss != nullptr) { 74 mutable_ss = filter_reserved_signals(*ss); 75 mutable_ss_ptr = &mutable_ss; 76 } 77 78 return __ppoll(fds, fd_count, mutable_ts_ptr, mutable_ss_ptr, sizeof(*mutable_ss_ptr)); 79 } 80 81 int select(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, timeval* tv) { 82 timespec ts; 83 timespec* ts_ptr = nullptr; 84 if (tv != nullptr) { 85 if (!timespec_from_timeval(ts, *tv)) { 86 errno = EINVAL; 87 return -1; 88 } 89 ts_ptr = &ts; 90 } 91 int result = __pselect6(fd_count, read_fds, write_fds, error_fds, ts_ptr, nullptr); 92 if (tv != nullptr) { 93 timeval_from_timespec(*tv, ts); 94 } 95 return result; 96 } 97 98 int pselect(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, 99 const timespec* ts, const sigset_t* ss) { 100 // The underlying `__pselect6` system call only takes `sigset64_t`. 101 SigSetConverter set; 102 sigset64_t* ss_ptr = nullptr; 103 if (ss != nullptr) { 104 set = {}; 105 set.sigset = *ss; 106 ss_ptr = &set.sigset64; 107 } 108 return pselect64(fd_count, read_fds, write_fds, error_fds, ts, ss_ptr); 109 } 110 111 int pselect64(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, 112 const timespec* ts, const sigset64_t* ss) { 113 // The underlying __pselect6 system call modifies its `struct timespec` argument. 114 timespec mutable_ts; 115 timespec* mutable_ts_ptr = nullptr; 116 if (ts != nullptr) { 117 mutable_ts = *ts; 118 mutable_ts_ptr = &mutable_ts; 119 } 120 121 sigset64_t mutable_ss; 122 sigset64_t* mutable_ss_ptr = nullptr; 123 if (ss != nullptr) { 124 mutable_ss = filter_reserved_signals(*ss); 125 mutable_ss_ptr = &mutable_ss; 126 } 127 128 // The Linux kernel only handles 6 arguments and this system call really needs 7, 129 // so the last argument is a void* pointing to: 130 struct pselect6_extra_data_t { 131 uintptr_t ss_addr; 132 size_t ss_len; 133 }; 134 pselect6_extra_data_t extra_data; 135 extra_data.ss_addr = reinterpret_cast<uintptr_t>(mutable_ss_ptr); 136 extra_data.ss_len = sizeof(*mutable_ss_ptr); 137 138 return __pselect6(fd_count, read_fds, write_fds, error_fds, mutable_ts_ptr, &extra_data); 139 } 140
