1 /* 2 * QEMU I/O channels external command driver 3 * 4 * Copyright (c) 2015 Red Hat, Inc. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #ifndef QIO_CHANNEL_COMMAND_H__ 22 #define QIO_CHANNEL_COMMAND_H__ 23 24 #include "io/channel.h" 25 26 #define TYPE_QIO_CHANNEL_COMMAND "qio-channel-command" 27 #define QIO_CHANNEL_COMMAND(obj) \ 28 OBJECT_CHECK(QIOChannelCommand, (obj), TYPE_QIO_CHANNEL_COMMAND) 29 30 typedef struct QIOChannelCommand QIOChannelCommand; 31 32 33 /** 34 * QIOChannelCommand: 35 * 36 * The QIOChannelCommand class provides a channel implementation 37 * that can transport data with an externally running command 38 * via its stdio streams. 39 */ 40 41 struct QIOChannelCommand { 42 QIOChannel parent; 43 int writefd; 44 int readfd; 45 pid_t pid; 46 }; 47 48 49 /** 50 * qio_channel_command_new_pid: 51 * @writefd: the FD connected to the command's stdin 52 * @readfd: the FD connected to the command's stdout 53 * @pid: the PID of the running child command 54 * @errp: pointer to a NULL-initialized error object 55 * 56 * Create a channel for performing I/O with the 57 * previously spawned command identified by @pid. 58 * The two file descriptors provide the connection 59 * to command's stdio streams, either one or which 60 * may be -1 to indicate that stream is not open. 61 * 62 * The channel will take ownership of the process 63 * @pid and will kill it when closing the channel. 64 * Similarly it will take responsibility for 65 * closing the file descriptors @writefd and @readfd. 66 * 67 * Returns: the command channel object, or NULL on error 68 */ 69 QIOChannelCommand * 70 qio_channel_command_new_pid(int writefd, 71 int readfd, 72 pid_t pid); 73 74 /** 75 * qio_channel_command_new_spawn: 76 * @argv: the NULL terminated list of command arguments 77 * @flags: the I/O mode, one of O_RDONLY, O_WRONLY, O_RDWR 78 * @errp: pointer to a NULL-initialized error object 79 * 80 * Create a channel for performing I/O with the 81 * command to be spawned with arguments @argv. 82 * 83 * Returns: the command channel object, or NULL on error 84 */ 85 QIOChannelCommand * 86 qio_channel_command_new_spawn(const char *const argv[], 87 int flags, 88 Error **errp); 89 90 91 #endif /* QIO_CHANNEL_COMMAND_H__ */ 92