[1506] | 1 | //vio_select.c: |
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| 2 | |
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| 3 | /* |
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[4708] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2011 |
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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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[3897] | 39 | #ifdef ROAR_HAVE_SELECT |
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[3767] | 40 | struct timeval tv; |
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[3897] | 41 | fd_set rfds, wfds, efds; |
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| 42 | #endif |
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[3767] | 43 | size_t i; |
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[5018] | 44 | #ifdef ROAR_HAVE_SELECT |
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[3767] | 45 | int max_fh = -1; |
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[5018] | 46 | #endif |
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[3767] | 47 | int ret; |
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[4083] | 48 | #ifdef DEBUG |
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| 49 | char * name; |
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| 50 | #endif |
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[3767] | 51 | |
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| 52 | 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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| 53 | |
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| 54 | if ( len == 0 ) { |
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| 55 | 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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| 56 | return 0; |
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| 57 | } |
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| 58 | |
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| 59 | if ( vios == NULL ) { |
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| 60 | 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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| 61 | return -1; |
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| 62 | } |
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| 63 | |
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[4083] | 64 | // pepaer internal structs: |
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[3767] | 65 | for (i = 0; i < len; i++) { |
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[4083] | 66 | ROAR_DBG("roar_vio_select(vios=%p, len=%llu, rtv=%p, ctl=%p): vios[i=%i].fh=%i", vios, (long long unsigned int)len, rtv, ctl, i, vios[i].fh); |
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[3767] | 67 | if ( vios[i].fh == -1 ) { |
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[4083] | 68 | #ifdef DEBUG |
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| 69 | name = NULL; |
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| 70 | roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_NAME, &name); |
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| 71 | ROAR_DBG("roar_vio_select(*): vios[%i]'s name is: '%s'", i, name); |
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| 72 | #endif |
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| 73 | |
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[3767] | 74 | vios[i].internal.action = ROAR_VIO_SELECT_ACTION_NONE; |
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| 75 | |
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| 76 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) { |
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| 77 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_READ_FH, &(vios[i].internal.fh[0])) == -1 ) { |
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| 78 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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| 79 | vios[i].internal.fh[0] = -1; |
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| 80 | } else { |
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| 81 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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| 82 | } |
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| 83 | } |
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| 84 | |
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| 85 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) { |
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| 86 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_WRITE_FH, &(vios[i].internal.fh[1])) == -1 ) { |
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| 87 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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| 88 | vios[i].internal.fh[1] = -1; |
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| 89 | } else { |
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| 90 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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| 91 | } |
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| 92 | } |
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| 93 | |
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| 94 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) { |
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| 95 | if ( roar_vio_ctl(vios[i].vio, ROAR_VIO_CTL_GET_SELECT_FH, &(vios[i].internal.fh[2])) == -1 ) { |
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| 96 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_VIOS; |
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| 97 | vios[i].internal.fh[2] = -1; |
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| 98 | } else { |
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| 99 | vios[i].internal.action |= ROAR_VIO_SELECT_ACTION_SELECT; |
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| 100 | } |
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| 101 | } |
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[4083] | 102 | ROAR_DBG("roar_vio_select(*): vios[%i].internal.fh[] = {%i, %i, %i}", i, vios[i].internal.fh[0], vios[i].internal.fh[1], vios[i].internal.fh[2]); |
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[3767] | 103 | } else { |
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| 104 | vios[i].internal.action = ROAR_VIO_SELECT_ACTION_SELECT; |
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| 105 | vios[i].internal.fh[0] = vios[i].fh; |
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| 106 | vios[i].internal.fh[1] = vios[i].fh; |
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| 107 | vios[i].internal.fh[2] = vios[i].fh; |
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| 108 | } |
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| 109 | } |
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| 110 | |
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| 111 | // check: |
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| 112 | for (i = 0; i < len; i++) { |
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| 113 | if ( !( vios[i].internal.action == 0 || vios[i].internal.action == ROAR_VIO_SELECT_ACTION_SELECT ) ) { |
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| 114 | // we currently do not support non-select selects. |
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| 115 | // TODO: Fix this. |
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| 116 | 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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| 117 | return -1; |
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| 118 | } |
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| 119 | } |
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| 120 | |
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[3897] | 121 | #ifdef ROAR_HAVE_SELECT |
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[3767] | 122 | // prepaer fdsets: |
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| 123 | FD_ZERO(&rfds); |
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| 124 | FD_ZERO(&wfds); |
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| 125 | FD_ZERO(&efds); |
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| 126 | |
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| 127 | for (i = 0; i < len; i++) { |
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| 128 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) { |
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[3770] | 129 | 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] | 130 | FD_SET(vios[i].internal.fh[0], &rfds); |
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| 131 | if ( vios[i].internal.fh[0] > max_fh ) |
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| 132 | max_fh = vios[i].internal.fh[0]; |
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| 133 | } |
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| 134 | |
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| 135 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) { |
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[3770] | 136 | 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] | 137 | FD_SET(vios[i].internal.fh[1], &wfds); |
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| 138 | if ( vios[i].internal.fh[1] > max_fh ) |
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| 139 | max_fh = vios[i].internal.fh[1]; |
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| 140 | } |
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| 141 | |
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| 142 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) { |
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[3770] | 143 | 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] | 144 | FD_SET(vios[i].internal.fh[2], &efds); |
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| 145 | if ( vios[i].internal.fh[2] > max_fh ) |
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| 146 | max_fh = vios[i].internal.fh[2]; |
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| 147 | } |
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| 148 | } |
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| 149 | |
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| 150 | // the the select: |
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| 151 | if ( rtv == NULL ) { |
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| 152 | tv.tv_sec = 1024; |
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| 153 | tv.tv_usec = 0; |
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| 154 | } else { |
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| 155 | tv.tv_sec = rtv->sec; |
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| 156 | tv.tv_usec = rtv->nsec / 1000; |
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[5074] | 157 | if ( tv.tv_sec == 0 && tv.tv_usec == 0 ) |
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| 158 | tv.tv_usec = 1; |
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[3767] | 159 | } |
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| 160 | |
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[3770] | 161 | |
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| 162 | 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] | 163 | ret = select(max_fh + 1, &rfds, &wfds, &efds, &tv); |
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[3770] | 164 | 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] | 165 | |
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| 166 | // ret == -1 -> Error |
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| 167 | // ret == 0 -> No data |
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[3770] | 168 | if ( ret < 1 ) { |
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| 169 | 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] | 170 | return ret; |
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[3770] | 171 | } |
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[3767] | 172 | |
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| 173 | // set eventsa: |
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| 174 | for (i = 0; i < len; i++) { |
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| 175 | vios[i].eventsa = ROAR_VIO_SELECT_NONE; |
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| 176 | |
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| 177 | if ( vios[i].eventsq & ROAR_VIO_SELECT_READ ) |
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| 178 | if ( FD_ISSET(vios[i].internal.fh[0], &rfds) ) |
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| 179 | vios[i].eventsa |= ROAR_VIO_SELECT_READ; |
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| 180 | |
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| 181 | if ( vios[i].eventsq & ROAR_VIO_SELECT_WRITE ) |
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| 182 | if ( FD_ISSET(vios[i].internal.fh[1], &wfds) ) |
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| 183 | vios[i].eventsa |= ROAR_VIO_SELECT_WRITE; |
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| 184 | |
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| 185 | if ( vios[i].eventsq & ROAR_VIO_SELECT_EXCEPT ) |
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| 186 | if ( FD_ISSET(vios[i].internal.fh[2], &efds) ) |
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| 187 | vios[i].eventsa |= ROAR_VIO_SELECT_EXCEPT; |
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| 188 | } |
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| 189 | |
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[3897] | 190 | #else |
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| 191 | ret = -1; |
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| 192 | #endif |
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| 193 | |
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[3767] | 194 | 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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| 195 | return ret; |
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| 196 | } |
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| 197 | |
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[1506] | 198 | //ll |
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