[1255] | 1 | //vio_cmd.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
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| 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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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | * NOTE for everyone want's to change something and send patches: |
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| 24 | * read README and HACKING! There a addition information on |
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| 25 | * the license of this document you need to read before you send |
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| 26 | * any patches. |
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| 27 | * |
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| 28 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 29 | * or libpulse*: |
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| 30 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 31 | * and are therefore GPL. Because of this it may be illigal to use |
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| 32 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 33 | */ |
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| 34 | |
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| 35 | #include "libroar.h" |
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| 36 | |
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| 37 | int roar_vio_open_cmd(struct roar_vio_calls * calls, struct roar_vio_calls * dst, |
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| 38 | int flags, char * reader, char * writer, int options) { |
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| 39 | struct roar_vio_cmd_state * state; |
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| 40 | |
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| 41 | if ( calls == NULL || dst == NULL ) |
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| 42 | return -1; |
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| 43 | |
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[1260] | 44 | /* |
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[1255] | 45 | if ( flags == 0 ) |
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| 46 | return -1; |
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[1260] | 47 | */ |
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[1255] | 48 | |
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| 49 | if ( reader == NULL && writer == NULL ) |
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| 50 | return -1; |
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| 51 | |
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| 52 | if ( (state = malloc(sizeof(struct roar_vio_cmd_state))) == NULL ) |
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| 53 | return -1; |
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| 54 | |
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[1260] | 55 | ROAR_DBG("roar_vio_open_cmd(*): pre reqs are OK"); |
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| 56 | |
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[1255] | 57 | // clear all |
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| 58 | memset(calls, 0, sizeof(struct roar_vio_calls)); |
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| 59 | memset(state, 0, sizeof(struct roar_vio_cmd_state)); |
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| 60 | |
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| 61 | // init reader and writer: |
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| 62 | state->reader.pid = -1; |
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| 63 | state->reader.in = -1; |
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| 64 | state->reader.out = -1; |
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| 65 | |
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| 66 | if ( reader != NULL ) |
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| 67 | state->reader.cmd = strdup(reader); |
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| 68 | |
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| 69 | state->writer.pid = -1; |
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| 70 | state->writer.in = -1; |
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| 71 | state->writer.out = -1; |
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| 72 | |
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| 73 | if ( writer != NULL ) |
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| 74 | state->writer.cmd = strdup(writer); |
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| 75 | |
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| 76 | // init state |
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| 77 | state->next = dst; |
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| 78 | state->flags = flags; |
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| 79 | state->options = options; |
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| 80 | |
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| 81 | // init calls |
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[1260] | 82 | calls->close = roar_vio_cmd_close; |
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| 83 | calls->read = roar_vio_cmd_read; |
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| 84 | calls->write = roar_vio_cmd_write; |
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| 85 | calls->nonblock = roar_vio_cmd_nonblock; |
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| 86 | calls->sync = roar_vio_cmd_sync; |
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| 87 | calls->inst = (void*) state; |
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| 88 | |
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| 89 | ROAR_DBG("roar_vio_open_cmd(*): var setup OK"); |
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[1255] | 90 | |
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[1257] | 91 | if ( !(options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) { |
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| 92 | if ( reader != NULL ) |
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| 93 | if ( roar_vio_cmd_fork(&(state->reader)) == -1 ) |
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| 94 | return roar_vio_cmd_close(calls); |
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[1255] | 95 | |
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[1257] | 96 | if ( writer != NULL ) |
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| 97 | if ( roar_vio_cmd_fork(&(state->writer)) == -1 ) |
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| 98 | return roar_vio_cmd_close(calls); |
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| 99 | } |
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[1255] | 100 | |
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| 101 | return 0; |
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| 102 | } |
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| 103 | |
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| 104 | int roar_vio_cmd_close(struct roar_vio_calls * vio) { |
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| 105 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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| 106 | |
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| 107 | if ( state->reader.opened ) |
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| 108 | roar_vio_cmd_wait(&(state->reader)); |
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| 109 | |
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| 110 | if ( state->writer.opened ) |
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| 111 | roar_vio_cmd_wait(&(state->writer)); |
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| 112 | |
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| 113 | if ( state->reader.cmd != NULL ) |
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| 114 | free(state->reader.cmd); |
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| 115 | |
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| 116 | if ( state->writer.cmd != NULL ) |
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| 117 | free(state->writer.cmd); |
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| 118 | |
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| 119 | roar_vio_close(state->next); |
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| 120 | |
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| 121 | free(state); |
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| 122 | |
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| 123 | return 0; |
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| 124 | } |
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| 125 | |
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| 126 | int roar_vio_cmd_fork(struct roar_vio_cmd_child * child) { |
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[1256] | 127 | int in[2], out[2]; |
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| 128 | |
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| 129 | if ( child == NULL ) |
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| 130 | return -1; |
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| 131 | |
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| 132 | if ( child->opened ) |
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| 133 | return 0; |
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| 134 | |
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| 135 | if ( child->cmd == NULL ) |
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| 136 | return -1; |
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| 137 | |
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| 138 | // open some pipes... |
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| 139 | if ( pipe(in) != 0 ) |
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| 140 | return -1; |
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| 141 | |
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| 142 | if ( pipe(out) != 0 ) { |
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| 143 | close(in[0]); |
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| 144 | close(in[1]); |
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| 145 | return -1; |
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| 146 | } |
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| 147 | |
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| 148 | child->pid = fork(); |
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| 149 | |
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| 150 | switch (child->pid) { |
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| 151 | case -1: |
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| 152 | close(in[0]); |
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| 153 | close(in[1]); |
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| 154 | close(out[0]); |
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| 155 | close(out[1]); |
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| 156 | return -1; |
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| 157 | break; |
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| 158 | case 0: |
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| 159 | close(in[0]); |
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| 160 | close(out[1]); |
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| 161 | close(ROAR_STDIN); |
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| 162 | close(ROAR_STDOUT); |
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| 163 | |
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| 164 | if ( dup2(out[0], ROAR_STDIN) == -1 ) |
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| 165 | _exit(1); |
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| 166 | |
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| 167 | if ( dup2(in[1], ROAR_STDOUT) == -1 ) |
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| 168 | _exit(1); |
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| 169 | |
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| 170 | execlp("/bin/sh", "/bin/sh", "-c", child->cmd, NULL); |
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| 171 | |
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| 172 | _exit(1); |
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| 173 | break; |
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| 174 | } |
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| 175 | |
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| 176 | close(in[1]); |
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| 177 | close(out[0]); |
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| 178 | |
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| 179 | child->opened = 1; |
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| 180 | child->in = in[0]; |
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| 181 | child->out = out[1]; |
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| 182 | |
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| 183 | return 0; |
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[1255] | 184 | } |
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| 185 | |
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| 186 | int roar_vio_cmd_wait(struct roar_vio_cmd_child * child) { |
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| 187 | int status; |
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| 188 | |
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| 189 | if ( child == NULL ) |
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| 190 | return -1; |
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| 191 | |
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| 192 | if ( !child->opened ) |
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| 193 | return 0; |
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| 194 | |
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| 195 | if ( child->out != -1 ) |
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| 196 | close(child->out); |
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| 197 | |
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| 198 | if ( child->in != -1 ) |
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| 199 | close(child->in); |
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| 200 | |
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| 201 | waitpid(child->pid, &status, 0); |
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| 202 | |
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| 203 | return 0; |
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| 204 | } |
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| 205 | |
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[1256] | 206 | // VIOs: |
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| 207 | |
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| 208 | ssize_t roar_vio_cmd_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 209 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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[1257] | 210 | fd_set rfhs[1], wfhs[1]; |
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| 211 | struct timeval tv; |
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| 212 | size_t done = 0; |
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| 213 | int max_fh; |
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| 214 | int ret; |
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| 215 | char tbuf[ROAR_VIO_CMD_BUFSIZE]; |
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| 216 | char * tp = NULL; |
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| 217 | size_t tlen = 0; |
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[1256] | 218 | |
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[1260] | 219 | ROAR_DBG("roar_vio_cmd_read(*) = ?"); |
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| 220 | |
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[1256] | 221 | if ( !state->reader.opened ) { |
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| 222 | if ( buf == NULL && count == 0 ) /* sync: no need to do anything if no reader is forked :) */ |
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| 223 | return 0; |
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| 224 | |
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| 225 | if ( !(state->options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) /* we are not on demand and no reader exists? -> err */ |
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| 226 | return -1; |
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| 227 | |
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| 228 | if ( roar_vio_cmd_fork(&(state->reader)) == -1 ) |
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| 229 | return -1; |
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| 230 | } |
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| 231 | |
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[1257] | 232 | while (done < count) { |
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| 233 | if ( state->options & ROAR_VIO_CMD_OPTS_NONBLOCK ) { |
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| 234 | tv.tv_sec = 0; |
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| 235 | tv.tv_usec = 1; |
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| 236 | } else { |
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| 237 | tv.tv_sec = 3600; |
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| 238 | tv.tv_usec = 0; |
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| 239 | } |
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| 240 | |
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| 241 | FD_ZERO(rfhs); |
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| 242 | FD_ZERO(wfhs); |
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| 243 | |
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| 244 | FD_SET(state->reader.in, rfhs); |
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[1260] | 245 | |
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| 246 | if ( state->reader.out != -1 ) { |
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| 247 | FD_SET(state->reader.out, wfhs); |
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| 248 | } |
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| 249 | |
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| 250 | #ifdef DEBUG |
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| 251 | if ( FD_ISSET(state->reader.in, rfhs) ) { |
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| 252 | ROAR_DBG("roar_vio_cmd_read(*): reader set in fh group"); |
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| 253 | } |
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| 254 | #endif |
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[1257] | 255 | |
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| 256 | max_fh = state->reader.in > state->reader.out ? state->reader.in : state->reader.out; |
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[1260] | 257 | ROAR_DBG("roar_vio_cmd_read(*): max_fh=%i", max_fh); |
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[1257] | 258 | |
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[1260] | 259 | if ( (ret = select(max_fh + 1, rfhs, wfhs, NULL, &tv)) == -1 ) |
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[1257] | 260 | return -1; |
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| 261 | |
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[1260] | 262 | ROAR_DBG("roar_vio_cmd_read(*): select(*) = %i", ret); |
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| 263 | ROAR_DBG("roar_vio_cmd_read(*): reader=%i, writer=%i", state->reader.in, state->reader.out); |
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| 264 | |
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[1257] | 265 | if ( ret > 0 ) { |
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| 266 | if ( FD_ISSET(state->reader.in, rfhs) ) { |
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[1260] | 267 | ROAR_DBG("roar_vio_cmd_read(*): event on reader"); |
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| 268 | |
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[1257] | 269 | if ( (ret = read(state->reader.in, buf+done, count-done)) == -1 ) |
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| 270 | break; |
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| 271 | |
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| 272 | if ( ret == 0 ) |
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| 273 | break; |
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| 274 | |
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| 275 | done += ret; |
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| 276 | } |
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| 277 | |
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[1260] | 278 | if ( state->reader.out != -1 && FD_ISSET(state->reader.out, wfhs) ) { |
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| 279 | ROAR_DBG("roar_vio_cmd_read(*): event on writer"); |
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| 280 | |
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[1257] | 281 | if ( !tlen ) { |
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[1260] | 282 | tp = tbuf; |
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| 283 | tlen = 0; |
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[1257] | 284 | if ( (tlen = roar_vio_read(state->next, tp, ROAR_VIO_CMD_BUFSIZE)) == -1 ) |
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[1260] | 285 | continue; |
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[1257] | 286 | } |
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| 287 | |
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| 288 | if ( tlen ) { |
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| 289 | if ( (ret = write(state->reader.out, tp, tlen)) > 0 ) { |
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| 290 | tlen -= ret; |
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| 291 | tp += ret; |
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| 292 | } |
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[1260] | 293 | } else { |
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| 294 | close(state->reader.out); |
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| 295 | state->reader.out = -1; |
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[1257] | 296 | } |
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| 297 | } |
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| 298 | } |
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| 299 | |
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| 300 | if ( state->options & ROAR_VIO_CMD_OPTS_NONBLOCK ) |
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| 301 | break; |
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| 302 | } |
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| 303 | |
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| 304 | if ( tlen ) { /* we have some data to write to the child... */ |
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| 305 | // TODO: try to write it out... |
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| 306 | return -1; |
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| 307 | } |
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| 308 | |
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| 309 | return done; |
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[1256] | 310 | } |
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| 311 | |
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| 312 | ssize_t roar_vio_cmd_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 313 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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| 314 | |
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| 315 | if ( !state->writer.opened ) { |
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| 316 | if ( buf == NULL && count == 0 ) /* sync: no need to do anything if no writer is forked :) */ |
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| 317 | return 0; |
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| 318 | |
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| 319 | if ( !(state->options & ROAR_VIO_CMD_OPTS_ON_DEMAND) ) /* we are not on demand and no writer exists? -> err */ |
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| 320 | return -1; |
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| 321 | |
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| 322 | if ( roar_vio_cmd_fork(&(state->writer)) == -1 ) |
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| 323 | return -1; |
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| 324 | } |
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| 325 | |
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| 326 | |
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| 327 | return -1; |
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| 328 | } |
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| 329 | |
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| 330 | int roar_vio_cmd_nonblock(struct roar_vio_calls * vio, int state) { |
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| 331 | struct roar_vio_cmd_state * self = (struct roar_vio_cmd_state *)vio->inst; |
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| 332 | |
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| 333 | self->options |= ROAR_VIO_CMD_OPTS_NONBLOCK; |
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| 334 | |
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| 335 | if ( state == ROAR_SOCKET_BLOCK ) |
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| 336 | self->options -= ROAR_VIO_CMD_OPTS_NONBLOCK; |
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| 337 | |
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[1257] | 338 | roar_vio_nonblock(self->next, state); // this should help, but may not nessessery. |
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| 339 | |
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[1256] | 340 | return 0; |
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| 341 | } |
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| 342 | |
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| 343 | int roar_vio_cmd_sync (struct roar_vio_calls * vio) { |
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| 344 | struct roar_vio_cmd_state * state = (struct roar_vio_cmd_state *)vio->inst; |
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| 345 | int oldblock; |
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| 346 | int ret = 0; |
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| 347 | |
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| 348 | oldblock = state->options & ROAR_VIO_CMD_OPTS_NONBLOCK ? ROAR_SOCKET_NONBLOCK : ROAR_SOCKET_BLOCK; |
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| 349 | |
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| 350 | if ( roar_vio_cmd_nonblock(vio, ROAR_SOCKET_BLOCK) == -1 ) |
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| 351 | return -1; |
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| 352 | |
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| 353 | if ( roar_vio_cmd_write(vio, NULL, 0) == -1 ) |
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| 354 | ret = -1; |
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| 355 | |
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| 356 | if ( roar_vio_cmd_read(vio, NULL, 0) == -1 ) |
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| 357 | ret = -1; |
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| 358 | |
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| 359 | if ( roar_vio_cmd_nonblock(vio, oldblock) == -1 ) |
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| 360 | return -1; |
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| 361 | |
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| 362 | return ret; |
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| 363 | } |
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| 364 | |
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[1255] | 365 | //ll |
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