821791b505
The "Error **errp" parameters must be NULL initialized not uninitialized. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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* QEMU I/O channels external command driver
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef QIO_CHANNEL_COMMAND_H__
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#define QIO_CHANNEL_COMMAND_H__
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#include "io/channel.h"
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#define TYPE_QIO_CHANNEL_COMMAND "qio-channel-command"
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#define QIO_CHANNEL_COMMAND(obj) \
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OBJECT_CHECK(QIOChannelCommand, (obj), TYPE_QIO_CHANNEL_COMMAND)
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typedef struct QIOChannelCommand QIOChannelCommand;
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/**
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* QIOChannelCommand:
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*
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* The QIOChannelCommand class provides a channel implementation
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* that can transport data with an externally running command
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* via its stdio streams.
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*/
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struct QIOChannelCommand {
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QIOChannel parent;
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int writefd;
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int readfd;
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pid_t pid;
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};
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/**
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* qio_channel_command_new_pid:
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* @writefd: the FD connected to the command's stdin
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* @readfd: the FD connected to the command's stdout
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* @pid: the PID of the running child command
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* @errp: pointer to a NULL-initialized error object
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*
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* Create a channel for performing I/O with the
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* previously spawned command identified by @pid.
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* The two file descriptors provide the connection
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* to command's stdio streams, either one or which
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* may be -1 to indicate that stream is not open.
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*
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* The channel will take ownership of the process
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* @pid and will kill it when closing the channel.
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* Similarly it will take responsibility for
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* closing the file descriptors @writefd and @readfd.
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*
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* Returns: the command channel object, or NULL on error
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*/
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QIOChannelCommand *
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qio_channel_command_new_pid(int writefd,
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int readfd,
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pid_t pid);
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/**
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* qio_channel_command_new_spawn:
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* @argv: the NULL terminated list of command arguments
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* @flags: the I/O mode, one of O_RDONLY, O_WRONLY, O_RDWR
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* @errp: pointer to a NULL-initialized error object
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*
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* Create a channel for performing I/O with the
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* command to be spawned with arguments @argv.
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*
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* Returns: the command channel object, or NULL on error
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*/
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QIOChannelCommand *
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qio_channel_command_new_spawn(const char *const argv[],
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int flags,
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Error **errp);
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#endif /* QIO_CHANNEL_COMMAND_H__ */
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