140 lines
4.7 KiB
C++
140 lines
4.7 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <sys/poll.h>
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#include <sys/select.h>
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#include <platform/bionic/reserved_signals.h>
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#include "private/bionic_time_conversions.h"
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#include "private/SigSetConverter.h"
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extern "C" int __ppoll(pollfd*, unsigned int, timespec*, const sigset64_t*, size_t);
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extern "C" int __pselect6(int, fd_set*, fd_set*, fd_set*, timespec*, void*);
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int poll(pollfd* fds, nfds_t fd_count, int ms) {
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timespec ts;
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timespec* ts_ptr = nullptr;
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if (ms >= 0) {
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timespec_from_ms(ts, ms);
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ts_ptr = &ts;
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}
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return __ppoll(fds, fd_count, ts_ptr, nullptr, 0);
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}
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int ppoll(pollfd* fds, nfds_t fd_count, const timespec* ts, const sigset_t* ss) {
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// The underlying `__ppoll` system call only takes `sigset64_t`.
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SigSetConverter set;
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sigset64_t* ss_ptr = nullptr;
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if (ss != nullptr) {
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set = {};
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set.sigset = *ss;
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ss_ptr = &set.sigset64;
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}
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return ppoll64(fds, fd_count, ts, ss_ptr);
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}
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int ppoll64(pollfd* fds, nfds_t fd_count, const timespec* ts, const sigset64_t* ss) {
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// The underlying __ppoll system call modifies its `struct timespec` argument.
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timespec mutable_ts;
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timespec* mutable_ts_ptr = nullptr;
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if (ts != nullptr) {
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mutable_ts = *ts;
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mutable_ts_ptr = &mutable_ts;
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}
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sigset64_t mutable_ss;
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sigset64_t* mutable_ss_ptr = nullptr;
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if (ss != nullptr) {
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mutable_ss = filter_reserved_signals(*ss, SIG_SETMASK);
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mutable_ss_ptr = &mutable_ss;
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}
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return __ppoll(fds, fd_count, mutable_ts_ptr, mutable_ss_ptr, sizeof(*mutable_ss_ptr));
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}
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int select(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, timeval* tv) {
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timespec ts;
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timespec* ts_ptr = nullptr;
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if (tv != nullptr) {
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if (!timespec_from_timeval(ts, *tv)) {
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errno = EINVAL;
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return -1;
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}
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ts_ptr = &ts;
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}
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int result = __pselect6(fd_count, read_fds, write_fds, error_fds, ts_ptr, nullptr);
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if (tv != nullptr) {
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timeval_from_timespec(*tv, ts);
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}
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return result;
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}
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int pselect(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds,
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const timespec* ts, const sigset_t* ss) {
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// The underlying `__pselect6` system call only takes `sigset64_t`.
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SigSetConverter set;
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sigset64_t* ss_ptr = nullptr;
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if (ss != nullptr) {
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set = {};
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set.sigset = *ss;
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ss_ptr = &set.sigset64;
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}
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return pselect64(fd_count, read_fds, write_fds, error_fds, ts, ss_ptr);
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}
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int pselect64(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds,
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const timespec* ts, const sigset64_t* ss) {
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// The underlying __pselect6 system call modifies its `struct timespec` argument.
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timespec mutable_ts;
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timespec* mutable_ts_ptr = nullptr;
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if (ts != nullptr) {
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mutable_ts = *ts;
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mutable_ts_ptr = &mutable_ts;
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}
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sigset64_t mutable_ss;
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sigset64_t* mutable_ss_ptr = nullptr;
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if (ss != nullptr) {
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mutable_ss = filter_reserved_signals(*ss, SIG_SETMASK);
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mutable_ss_ptr = &mutable_ss;
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}
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// The Linux kernel only handles 6 arguments and this system call really needs 7,
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// so the last argument is a void* pointing to:
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struct pselect6_extra_data_t {
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uintptr_t ss_addr;
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size_t ss_len;
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};
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pselect6_extra_data_t extra_data;
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extra_data.ss_addr = reinterpret_cast<uintptr_t>(mutable_ss_ptr);
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extra_data.ss_len = sizeof(*mutable_ss_ptr);
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return __pselect6(fd_count, read_fds, write_fds, error_fds, mutable_ts_ptr, &extra_data);
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}
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