14cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu/* 24cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * Copyright 2012, The Android Open Source Project 34cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * 44cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * Licensed under the Apache License, Version 2.0 (the "License"); 54cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * you may not use this file except in compliance with the License. 64cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * You may obtain a copy of the License at 74cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * 84cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * http://www.apache.org/licenses/LICENSE-2.0 94cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * 104cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * Unless required by applicable law or agreed to in writing, software 114cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * distributed under the License is distributed on an "AS IS" BASIS, 124cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 134cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * See the License for the specific language governing permissions and 144cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu * limitations under the License. 154cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu */ 164cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 176433ec22b1e20af20b31671b2fd4d5d235a7de52Andrew Hsieh#include <portability.h> 184cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu#include <poll.h> 194cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu#include <poll_portable.h> 204cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 212928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney/* 222928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney *_XOPEN_SOURCE added the ability to not only poll for data coming in or out 232928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * but now also the ability to poll for high priority input and output. Though 242928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * the normal priority is equivalent to the original I/O it was assigned new bits: 252928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLIN Equivalent to POLLRDNORM 262928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLOUT Equivalent to POLLWRNORM 272928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 282928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * The Linux kernel sets both POLLIN and POLLRDNORM when data is available and sets 292928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * both POLLOUT and POLLWRNORM when data can be written; so the new priority BAND bits 302928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * just supplement the meaning of the prior POLLIN and POLLOUT bits as well as the 312928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * new POLLRDNORM and POLLWRNORM bits. 322928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 332928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * The DECNet Protocol can set the poll in priority flag, POLLRDBAND. 342928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * ATM as well as a whole bunch of other protocols can set the poll out priority flag, 352928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLWRBAND. 362928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 372928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * MIPS and SPARC likely assigned the new XOPEN poll out event flags in UNIX well before 382928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * UNIX was ported to X86. It appears that Intel chose different bits and that was 392928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * established by Linus as the the generic case and later also chosen by ARM. 402928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 412928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLWRNORM:0x100 - MIPS used POLLOUT:0x0004, which is equivalent in meaning. 422928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 432928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLWRBAND:0x200 - MIPS used 0x0100. which is POLLWRNORM:0x100. 442928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 452928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * Summary: 462928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * ======== 472928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * Both Normal and Priority flags can be mapped to MIPS flags (left to right below). 482928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * Only the Priority poll out flag can be mapped back to portable because MIPS 492928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * is using the same number as POLLOUT for POLLWRNORM (right to left below). 502928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 512928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * ARM/GENERIC/PORTABLE MIPS 522928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * ==================== ====== 532928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLIN 0x0001 0x0001 542928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLPRI 0x0002 0x0002 552928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLOUT 0x0004 <-----+ 0x0004 562928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLERR 0x0008 \ 0x0008 572928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLHUP 0x0010 \ 0x0010 582928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLNVAL 0x0020 \ 0x0020 592928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLRDNORM 0x0040 \ 0x0040 602928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLRDBAND 0x0080 \ 0x0080 612928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLWRNORM 0x0100 -----------+<----> 0x0004 622928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLWRBAND 0x0200 <-----------------> 0x0100 632928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLMSG 0x0400 0x0400 642928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLREMOVE 0x1000 0x1000 652928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * POLLRDHUP 0x2000 0x2000 662928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * 672928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * The loss of the high priority notice for the polling 682928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * of output data is likely minor as it was only being used 692928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * in DECNet. Also, the poll system call and device poll 702928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * implementations processes POLLOUT and POLLWRNORM event 712928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * flags the same. 722928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney */ 732928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney 744cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu#if POLLWRNORM_PORTABLE==POLLWRNORM 754cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu#error Bad build environment 764cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu#endif 774cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 784cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fustatic inline short mips_change_portable_events(short portable_events) 794cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu{ 804cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu /* MIPS has different POLLWRNORM and POLLWRBAND. */ 814cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu if (portable_events & POLLWRNORM_PORTABLE) { 824cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu portable_events &= ~POLLWRNORM_PORTABLE; 834cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu portable_events |= POLLWRNORM; 844cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu } 854cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu if (portable_events & POLLWRBAND_PORTABLE) { 864cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu portable_events &= ~POLLWRBAND_PORTABLE; 874cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu portable_events |= POLLWRBAND; 884cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu } 894cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 904cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu return portable_events; 914cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu} 924cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 934cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fustatic inline short change_mips_events(short mips_events) 944cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu{ 952928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney /* 962928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * MIPS POLLWRNORM equals MIPS POLLOUT, which is the same as POLLOUT_PORTABLE; 972928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney * so we just map POLLWRBAND to POLLWRBAND_PORTABLE. 982928edfab922ff749cc8b90610cc4c228a4a2948Pete Delaney */ 994cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu if (mips_events & POLLWRBAND) { 1004cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu mips_events &= ~POLLWRBAND; 1014cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu mips_events |= POLLWRBAND_PORTABLE; 1024cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu } 1034cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 1044cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu return mips_events; 1054cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu} 1064cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 1074cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fuextern int poll(struct pollfd *, nfds_t, long); 1084cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 1096433ec22b1e20af20b31671b2fd4d5d235a7de52Andrew Hsiehint WRAP(poll)(struct pollfd *fds, nfds_t nfds, long timeout) 1104cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu{ 1114cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu nfds_t i; 1124cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu int ret; 1134cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 1144cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu for (i = 0; i < nfds; i++) 1154cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu fds->events = mips_change_portable_events(fds->events); 1164cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 1176433ec22b1e20af20b31671b2fd4d5d235a7de52Andrew Hsieh ret = REAL(poll)(fds, nfds, timeout); 1184cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 1194cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu for (i = 0; i < nfds; i++) { 1204cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu fds->events = change_mips_events(fds->events); 1214cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu fds->revents = change_mips_events(fds->revents); 1224cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu } 1234cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu 1244cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu return ret; 1254cd3283046090736ef32259fb5d38c9ba944d12fChao-Ying Fu} 126