[1506] | 1 | //vio_select.c: |
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| 2 | |
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| 3 | /* |
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[3811] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2010 |
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[1506] | 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[1506] | 23 | * |
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| 24 | * NOTE for everyone want's to change something and send patches: |
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| 25 | * read README and HACKING! There a addition information on |
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| 26 | * the license of this document you need to read before you send |
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| 27 | * any patches. |
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| 28 | * |
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| 29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 30 | * or libpulse*: |
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| 31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 32 | * and are therefore GPL. Because of this it may be illigal to use |
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| 33 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 34 | */ |
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| 35 | |
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| 36 | #include "libroar.h" |
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| 37 | |
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[3767] | 38 | ssize_t roar_vio_select(struct roar_vio_select * vios, size_t len, struct roar_vio_selecttv * rtv, struct roar_vio_selectctl * ctl) { |
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| 39 | struct timeval tv; |
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| 40 | size_t i; |
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| 41 | int max_fh = -1; |
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| 42 | int ret; |
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| 43 | fd_set rfds, wfds, efds; |
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| 44 | |
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| 45 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = ?", vios, (long long unsigned int)len, rtv, ctl); |
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| 46 | |
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| 47 | if ( len == 0 ) { |
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| 48 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = 0", vios, (long long unsigned int)len, rtv, ctl); |
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| 49 | return 0; |
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| 50 | } |
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| 51 | |
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| 52 | if ( vios == NULL ) { |
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| 53 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = -1", vios, (long long unsigned int)len, rtv, ctl); |
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| 54 | return -1; |
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| 55 | } |
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| 56 | |
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| 57 | // pepaer interl structs: |
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| 58 | for (i = 0; i < len; i++) { |
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| 59 | if ( vios[i].fh == -1 ) { |
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| 60 | vios[i].internal.action = ROAR_VIO_SELECT_ACTION_NONE; |
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| 61 | |
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| 62 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) { |
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| 63 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_READ_FH, &(vios[i].internal.fh[0])) == -1 ) { |
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| 64 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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| 65 | vios[i].internal.fh[0] = -1; |
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| 66 | } else { |
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| 67 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) { |
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| 72 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_WRITE_FH, &(vios[i].internal.fh[1])) == -1 ) { |
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| 73 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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| 74 | vios[i].internal.fh[1] = -1; |
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| 75 | } else { |
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| 76 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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| 77 | } |
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| 78 | } |
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| 79 | |
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| 80 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) { |
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| 81 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_FH, &(vios[i].internal.fh[2])) == -1 ) { |
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| 82 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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| 83 | vios[i].internal.fh[2] = -1; |
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| 84 | } else { |
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| 85 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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| 86 | } |
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| 87 | } |
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| 88 | } else { |
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| 89 | vios[i].internal.action = ROAR_VIO_SELECT_ACTION_SELECT; |
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| 90 | vios[i].internal.fh[0] = vios[i].fh; |
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| 91 | vios[i].internal.fh[1] = vios[i].fh; |
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| 92 | vios[i].internal.fh[2] = vios[i].fh; |
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| 93 | } |
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| 94 | } |
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| 95 | |
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| 96 | // check: |
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| 97 | for (i = 0; i < len; i++) { |
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| 98 | if ( !( vios[i].internal.action == 0 || vios[i].internal.action == ROAR_VIO_SELECT_ACTION_SELECT ) ) { |
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| 99 | // we currently do not support non-select selects. |
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| 100 | // TODO: Fix this. |
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| 101 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = -1", vios, (long long unsigned int)len, rtv, ctl); |
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| 102 | return -1; |
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| 103 | } |
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| 104 | } |
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| 105 | |
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| 106 | // prepaer fdsets: |
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| 107 | FD_ZERO(&rfds); |
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| 108 | FD_ZERO(&wfds); |
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| 109 | FD_ZERO(&efds); |
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| 110 | |
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| 111 | for (i = 0; i < len; i++) { |
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| 112 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) { |
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[3770] | 113 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): vios[i=%i] is READ, fh=%i", vios, (long long unsigned int)len, rtv, ctl, i, vios[i].internal.fh[0]); |
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[3767] | 114 | FD_SET(vios[i].internal.fh[0], &rfds); |
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| 115 | if ( vios[i].internal.fh[0] > max_fh ) |
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| 116 | max_fh = vios[i].internal.fh[0]; |
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| 117 | } |
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| 118 | |
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| 119 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) { |
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[3770] | 120 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): vios[i=%i] is WRITE, fh=%i", vios, (long long unsigned int)len, rtv, ctl, i, vios[i].internal.fh[1]); |
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[3767] | 121 | FD_SET(vios[i].internal.fh[1], &wfds); |
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| 122 | if ( vios[i].internal.fh[1] > max_fh ) |
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| 123 | max_fh = vios[i].internal.fh[1]; |
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| 124 | } |
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| 125 | |
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| 126 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) { |
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[3770] | 127 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): vios[i=%i] is EXCEPT, fh=%i", vios, (long long unsigned int)len, rtv, ctl, i, vios[i].internal.fh[2]); |
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[3767] | 128 | FD_SET(vios[i].internal.fh[2], &efds); |
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| 129 | if ( vios[i].internal.fh[2] > max_fh ) |
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| 130 | max_fh = vios[i].internal.fh[2]; |
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| 131 | } |
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| 132 | } |
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| 133 | |
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| 134 | // the the select: |
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| 135 | if ( rtv == NULL ) { |
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| 136 | tv.tv_sec = 1024; |
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| 137 | tv.tv_usec = 0; |
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| 138 | } else { |
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| 139 | tv.tv_sec = rtv->sec; |
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| 140 | tv.tv_usec = rtv->nsec / 1000; |
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| 141 | } |
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| 142 | |
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[3770] | 143 | |
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| 144 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): Doing select() with max_fh=%i", vios, (long long unsigned int)len, rtv, ctl, max_fh); |
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[3767] | 145 | ret = select(max_fh + 1, &rfds, &wfds, &efds, &tv); |
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[3770] | 146 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): select() returned %i", vios, (long long unsigned int)len, rtv, ctl, ret); |
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[3767] | 147 | |
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| 148 | // ret == -1 -> Error |
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| 149 | // ret == 0 -> No data |
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[3770] | 150 | if ( ret < 1 ) { |
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| 151 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = %lli", vios, (long long unsigned int)len, rtv, ctl, (long long int)ret); |
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[3767] | 152 | return ret; |
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[3770] | 153 | } |
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[3767] | 154 | |
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| 155 | // set eventsa: |
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| 156 | for (i = 0; i < len; i++) { |
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| 157 | vios[i].eventsa = ROAR_VIO_SELECT_NONE; |
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| 158 | |
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| 159 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) |
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| 160 | if ( FD_ISSET(vios[i].internal.fh[0], &rfds) ) |
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| 161 | vios[i].eventsa |= ROAR_VIO_SELECT_READ; |
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| 162 | |
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| 163 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) |
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| 164 | if ( FD_ISSET(vios[i].internal.fh[1], &wfds) ) |
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| 165 | vios[i].eventsa |= ROAR_VIO_SELECT_WRITE; |
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| 166 | |
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| 167 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) |
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| 168 | if ( FD_ISSET(vios[i].internal.fh[2], &efds) ) |
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| 169 | vios[i].eventsa |= ROAR_VIO_SELECT_EXCEPT; |
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| 170 | } |
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| 171 | |
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| 172 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p) = %lli", vios, (long long unsigned int)len, rtv, ctl, (long long int)ret); |
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| 173 | return ret; |
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| 174 | } |
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| 175 | |
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[1506] | 176 | //ll |
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