[mirror_qemu.git] / io / channel-command.c

/*
 * QEMU I/O channels external command driver
 *
 * Copyright (c) 2015 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "qemu/osdep.h"
#include "io/channel-command.h"
#include "io/channel-watch.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "qemu/sockets.h"
#include "trace.h"

#ifndef WIN32
/**
 * qio_channel_command_new_pid:
 * @writefd: the FD connected to the command's stdin
 * @readfd: the FD connected to the command's stdout
 * @pid: the PID of the running child command
 * @errp: pointer to a NULL-initialized error object
 *
 * Create a channel for performing I/O with the
 * previously spawned command identified by @pid.
 * The two file descriptors provide the connection
 * to command's stdio streams, either one or which
 * may be -1 to indicate that stream is not open.
 *
 * The channel will take ownership of the process
 * @pid and will kill it when closing the channel.
 * Similarly it will take responsibility for
 * closing the file descriptors @writefd and @readfd.
 *
 * Returns: the command channel object, or NULL on error
 */
static QIOChannelCommand *
qio_channel_command_new_pid(int writefd,
                            int readfd,
                            pid_t pid)
{
    QIOChannelCommand *ioc;

    ioc = QIO_CHANNEL_COMMAND(object_new(TYPE_QIO_CHANNEL_COMMAND));

    ioc->readfd = readfd;
    ioc->writefd = writefd;
    ioc->pid = pid;

    trace_qio_channel_command_new_pid(ioc, writefd, readfd, pid);
    return ioc;
}

QIOChannelCommand *
qio_channel_command_new_spawn(const char *const argv[],
                              int flags,
                              Error **errp)
{
    pid_t pid = -1;
    int stdinfd[2] = { -1, -1 };
    int stdoutfd[2] = { -1, -1 };
    int devnull = -1;
    bool stdinnull = false, stdoutnull = false;
    QIOChannelCommand *ioc;

    flags = flags & O_ACCMODE;

    if (flags == O_RDONLY) {
        stdinnull = true;
    }
    if (flags == O_WRONLY) {
        stdoutnull = true;
    }

    if (stdinnull || stdoutnull) {
        devnull = open("/dev/null", O_RDWR);
        if (devnull < 0) {
            error_setg_errno(errp, errno,
                             "Unable to open /dev/null");
            goto error;
        }
    }

    if ((!stdinnull && !g_unix_open_pipe(stdinfd, FD_CLOEXEC, NULL)) ||
        (!stdoutnull && !g_unix_open_pipe(stdoutfd, FD_CLOEXEC, NULL))) {
        error_setg_errno(errp, errno,
                         "Unable to open pipe");
        goto error;
    }

    pid = qemu_fork(errp);
    if (pid < 0) {
        goto error;
    }

    if (pid == 0) { /* child */
        dup2(stdinnull ? devnull : stdinfd[0], STDIN_FILENO);
        dup2(stdoutnull ? devnull : stdoutfd[1], STDOUT_FILENO);
        /* Leave stderr connected to qemu's stderr */

        if (!stdinnull) {
            close(stdinfd[0]);
            close(stdinfd[1]);
        }
        if (!stdoutnull) {
            close(stdoutfd[0]);
            close(stdoutfd[1]);
        }
        if (devnull != -1) {
            close(devnull);
        }

        execv(argv[0], (char * const *)argv);
        _exit(1);
    }

    if (!stdinnull) {
        close(stdinfd[0]);
    }
    if (!stdoutnull) {
        close(stdoutfd[1]);
    }

    ioc = qio_channel_command_new_pid(stdinnull ? devnull : stdinfd[1],
                                      stdoutnull ? devnull : stdoutfd[0],
                                      pid);
    trace_qio_channel_command_new_spawn(ioc, argv[0], flags);
    return ioc;

 error:
    if (devnull != -1) {
        close(devnull);
    }
    if (stdinfd[0] != -1) {
        close(stdinfd[0]);
    }
    if (stdinfd[1] != -1) {
        close(stdinfd[1]);
    }
    if (stdoutfd[0] != -1) {
        close(stdoutfd[0]);
    }
    if (stdoutfd[1] != -1) {
        close(stdoutfd[1]);
    }
    return NULL;
}

#else /* WIN32 */
QIOChannelCommand *
qio_channel_command_new_spawn(const char *const argv[],
                              int flags,
                              Error **errp)
{
    error_setg_errno(errp, ENOSYS,
                     "Command spawn not supported on this platform");
    return NULL;
}
#endif /* WIN32 */

#ifndef WIN32
static int qio_channel_command_abort(QIOChannelCommand *ioc,
                                     Error **errp)
{
    pid_t ret;
    int status;
    int step = 0;

    /* See if intermediate process has exited; if not, try a nice
     * SIGTERM followed by a more severe SIGKILL.
     */
 rewait:
    trace_qio_channel_command_abort(ioc, ioc->pid);
    ret = waitpid(ioc->pid, &status, WNOHANG);
    trace_qio_channel_command_wait(ioc, ioc->pid, ret, status);
    if (ret == (pid_t)-1) {
        if (errno == EINTR) {
            goto rewait;
        } else {
            error_setg_errno(errp, errno,
                             "Cannot wait on pid %llu",
                             (unsigned long long)ioc->pid);
            return -1;
        }
    } else if (ret == 0) {
        if (step == 0) {
            kill(ioc->pid, SIGTERM);
        } else if (step == 1) {
            kill(ioc->pid, SIGKILL);
        } else {
            error_setg(errp,
                       "Process %llu refused to die",
                       (unsigned long long)ioc->pid);
            return -1;
        }
        step++;
        usleep(10 * 1000);
        goto rewait;
    }

    return 0;
}
#endif /* ! WIN32 */


static void qio_channel_command_init(Object *obj)
{
    QIOChannelCommand *ioc = QIO_CHANNEL_COMMAND(obj);
    ioc->readfd = -1;
    ioc->writefd = -1;
    ioc->pid = -1;
}

static void qio_channel_command_finalize(Object *obj)
{
    QIOChannelCommand *ioc = QIO_CHANNEL_COMMAND(obj);
    if (ioc->readfd != -1) {
        close(ioc->readfd);
    }
    if (ioc->writefd != -1 &&
        ioc->writefd != ioc->readfd) {
        close(ioc->writefd);
    }
    ioc->writefd = ioc->readfd = -1;
    if (ioc->pid > 0) {
#ifndef WIN32
        qio_channel_command_abort(ioc, NULL);
#endif
    }
}


static ssize_t qio_channel_command_readv(QIOChannel *ioc,
                                         const struct iovec *iov,
                                         size_t niov,
                                         int **fds,
                                         size_t *nfds,
                                         Error **errp)
{
    QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
    ssize_t ret;

 retry:
    ret = readv(cioc->readfd, iov, niov);
    if (ret < 0) {
        if (errno == EAGAIN) {
            return QIO_CHANNEL_ERR_BLOCK;
        }
        if (errno == EINTR) {
            goto retry;
        }

        error_setg_errno(errp, errno,
                         "Unable to read from command");
        return -1;
    }

    return ret;
}

static ssize_t qio_channel_command_writev(QIOChannel *ioc,
                                          const struct iovec *iov,
                                          size_t niov,
                                          int *fds,
                                          size_t nfds,
                                          Error **errp)
{
    QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
    ssize_t ret;

 retry:
    ret = writev(cioc->writefd, iov, niov);
    if (ret <= 0) {
        if (errno == EAGAIN) {
            return QIO_CHANNEL_ERR_BLOCK;
        }
        if (errno == EINTR) {
            goto retry;
        }
        error_setg_errno(errp, errno, "%s",
                         "Unable to write to command");
        return -1;
    }
    return ret;
}

static int qio_channel_command_set_blocking(QIOChannel *ioc,
                                            bool enabled,
                                            Error **errp)
{
#ifdef WIN32
    /* command spawn is not supported on win32 */
    g_assert_not_reached();
#else
    QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);

    if (!g_unix_set_fd_nonblocking(cioc->writefd, !enabled, NULL) ||
        !g_unix_set_fd_nonblocking(cioc->readfd, !enabled, NULL)) {
        error_setg_errno(errp, errno, "Failed to set FD nonblocking");
        return -1;
    }
#endif
    return 0;
}


static int qio_channel_command_close(QIOChannel *ioc,
                                     Error **errp)
{
    QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
    int rv = 0;
#ifndef WIN32
    pid_t wp;
#endif

    /* We close FDs before killing, because that
     * gives a better chance of clean shutdown
     */
    if (cioc->readfd != -1 &&
        close(cioc->readfd) < 0) {
        rv = -1;
    }
    if (cioc->writefd != -1 &&
        cioc->writefd != cioc->readfd &&
        close(cioc->writefd) < 0) {
        rv = -1;
    }
    cioc->writefd = cioc->readfd = -1;

#ifndef WIN32
    do {
        wp = waitpid(cioc->pid, NULL, 0);
    } while (wp == (pid_t)-1 && errno == EINTR);
    if (wp == (pid_t)-1) {
        error_setg_errno(errp, errno, "Failed to wait for pid %llu",
                         (unsigned long long)cioc->pid);
        return -1;
    }
#endif

    if (rv < 0) {
        error_setg_errno(errp, errno, "%s",
                         "Unable to close command");
    }
    return rv;
}


static void qio_channel_command_set_aio_fd_handler(QIOChannel *ioc,
                                                   AioContext *ctx,
                                                   IOHandler *io_read,
                                                   IOHandler *io_write,
                                                   void *opaque)
{
    QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
    aio_set_fd_handler(ctx, cioc->readfd, false,
                       io_read, NULL, NULL, NULL, opaque);
    aio_set_fd_handler(ctx, cioc->writefd, false,
                       NULL, io_write, NULL, NULL, opaque);
}


static GSource *qio_channel_command_create_watch(QIOChannel *ioc,
                                                 GIOCondition condition)
{
    QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
    return qio_channel_create_fd_pair_watch(ioc,
                                            cioc->readfd,
                                            cioc->writefd,
                                            condition);
}


static void qio_channel_command_class_init(ObjectClass *klass,
                                           void *class_data G_GNUC_UNUSED)
{
    QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);

    ioc_klass->io_writev = qio_channel_command_writev;
    ioc_klass->io_readv = qio_channel_command_readv;
    ioc_klass->io_set_blocking = qio_channel_command_set_blocking;
    ioc_klass->io_close = qio_channel_command_close;
    ioc_klass->io_create_watch = qio_channel_command_create_watch;
    ioc_klass->io_set_aio_fd_handler = qio_channel_command_set_aio_fd_handler;
}

static const TypeInfo qio_channel_command_info = {
    .parent = TYPE_QIO_CHANNEL,
    .name = TYPE_QIO_CHANNEL_COMMAND,
    .instance_size = sizeof(QIOChannelCommand),
    .instance_init = qio_channel_command_init,
    .instance_finalize = qio_channel_command_finalize,
    .class_init = qio_channel_command_class_init,
};

static void qio_channel_command_register_types(void)
{
    type_register_static(&qio_channel_command_info);
}

type_init(qio_channel_command_register_types);
Commit	Line	Data
195e14d0 DB	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
c8198bd5	9	* version 2.1 of the License, or (at your option) any later version.
195e14d0 DB	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
cae9fc56	21	#include "qemu/osdep.h"
195e14d0 DB	22	#include "io/channel-command.h"
195e14d0 DB	23	#include "io/channel-watch.h"
da34e65c	24	#include "qapi/error.h"
0b8fa32f	25	#include "qemu/module.h"
195e14d0 DB	26	#include "qemu/sockets.h"
	27	#include "trace.h"
	28
05e50e8f MAL	29	#ifndef WIN32
	30	/**
	31	* qio_channel_command_new_pid:
	32	* @writefd: the FD connected to the command's stdin
	33	* @readfd: the FD connected to the command's stdout
	34	* @pid: the PID of the running child command
	35	* @errp: pointer to a NULL-initialized error object
	36	*
	37	* Create a channel for performing I/O with the
	38	* previously spawned command identified by @pid.
	39	* The two file descriptors provide the connection
	40	* to command's stdio streams, either one or which
	41	* may be -1 to indicate that stream is not open.
	42	*
	43	* The channel will take ownership of the process
	44	* @pid and will kill it when closing the channel.
	45	* Similarly it will take responsibility for
	46	* closing the file descriptors @writefd and @readfd.
	47	*
	48	* Returns: the command channel object, or NULL on error
	49	*/
	50	static QIOChannelCommand *
195e14d0 DB	51	qio_channel_command_new_pid(int writefd,
	52	int readfd,
	53	pid_t pid)
	54	{
	55	QIOChannelCommand *ioc;
	56
	57	ioc = QIO_CHANNEL_COMMAND(object_new(TYPE_QIO_CHANNEL_COMMAND));
	58
	59	ioc->readfd = readfd;
	60	ioc->writefd = writefd;
	61	ioc->pid = pid;
	62
	63	trace_qio_channel_command_new_pid(ioc, writefd, readfd, pid);
	64	return ioc;
	65	}
	66
195e14d0 DB	67	QIOChannelCommand *
	68	qio_channel_command_new_spawn(const char *const argv[],
	69	int flags,
	70	Error **errp)
	71	{
	72	pid_t pid = -1;
	73	int stdinfd[2] = { -1, -1 };
	74	int stdoutfd[2] = { -1, -1 };
	75	int devnull = -1;
	76	bool stdinnull = false, stdoutnull = false;
	77	QIOChannelCommand *ioc;
	78
	79	flags = flags & O_ACCMODE;
	80
	81	if (flags == O_RDONLY) {
	82	stdinnull = true;
	83	}
	84	if (flags == O_WRONLY) {
	85	stdoutnull = true;
	86	}
	87
	88	if (stdinnull \|\| stdoutnull) {
	89	devnull = open("/dev/null", O_RDWR);
e155494c	90	if (devnull < 0) {
195e14d0 DB	91	error_setg_errno(errp, errno,
	92	"Unable to open /dev/null");
	93	goto error;
	94	}
	95	}
	96
d640b59e MAL	97	if ((!stdinnull && !g_unix_open_pipe(stdinfd, FD_CLOEXEC, NULL)) \|\|
d640b59e MAL	98	(!stdoutnull && !g_unix_open_pipe(stdoutfd, FD_CLOEXEC, NULL))) {
195e14d0 DB	99	error_setg_errno(errp, errno,
	100	"Unable to open pipe");
	101	goto error;
	102	}
	103
	104	pid = qemu_fork(errp);
	105	if (pid < 0) {
	106	goto error;
	107	}
	108
	109	if (pid == 0) { /* child */
	110	dup2(stdinnull ? devnull : stdinfd[0], STDIN_FILENO);
	111	dup2(stdoutnull ? devnull : stdoutfd[1], STDOUT_FILENO);
	112	/* Leave stderr connected to qemu's stderr */
	113
	114	if (!stdinnull) {
	115	close(stdinfd[0]);
	116	close(stdinfd[1]);
	117	}
	118	if (!stdoutnull) {
	119	close(stdoutfd[0]);
	120	close(stdoutfd[1]);
	121	}
e155494c DB	122	if (devnull != -1) {
	123	close(devnull);
	124	}
195e14d0 DB	125
	126	execv(argv[0], (char * const *)argv);
	127	_exit(1);
	128	}
	129
	130	if (!stdinnull) {
	131	close(stdinfd[0]);
	132	}
	133	if (!stdoutnull) {
	134	close(stdoutfd[1]);
	135	}
	136
	137	ioc = qio_channel_command_new_pid(stdinnull ? devnull : stdinfd[1],
	138	stdoutnull ? devnull : stdoutfd[0],
	139	pid);
	140	trace_qio_channel_command_new_spawn(ioc, argv[0], flags);
	141	return ioc;
	142
	143	error:
e155494c DB	144	if (devnull != -1) {
	145	close(devnull);
	146	}
195e14d0 DB	147	if (stdinfd[0] != -1) {
	148	close(stdinfd[0]);
	149	}
	150	if (stdinfd[1] != -1) {
	151	close(stdinfd[1]);
	152	}
	153	if (stdoutfd[0] != -1) {
	154	close(stdoutfd[0]);
	155	}
	156	if (stdoutfd[1] != -1) {
	157	close(stdoutfd[1]);
	158	}
	159	return NULL;
	160	}
	161
	162	#else /* WIN32 */
	163	QIOChannelCommand *
	164	qio_channel_command_new_spawn(const char *const argv[],
	165	int flags,
	166	Error **errp)
	167	{
	168	error_setg_errno(errp, ENOSYS,
	169	"Command spawn not supported on this platform");
	170	return NULL;
	171	}
	172	#endif /* WIN32 */
	173
	174	#ifndef WIN32
	175	static int qio_channel_command_abort(QIOChannelCommand *ioc,
	176	Error **errp)
	177	{
	178	pid_t ret;
	179	int status;
	180	int step = 0;
	181
	182	/* See if intermediate process has exited; if not, try a nice
	183	* SIGTERM followed by a more severe SIGKILL.
	184	*/
	185	rewait:
	186	trace_qio_channel_command_abort(ioc, ioc->pid);
	187	ret = waitpid(ioc->pid, &status, WNOHANG);
	188	trace_qio_channel_command_wait(ioc, ioc->pid, ret, status);
	189	if (ret == (pid_t)-1) {
	190	if (errno == EINTR) {
	191	goto rewait;
	192	} else {
	193	error_setg_errno(errp, errno,
	194	"Cannot wait on pid %llu",
	195	(unsigned long long)ioc->pid);
	196	return -1;
	197	}
	198	} else if (ret == 0) {
	199	if (step == 0) {
	200	kill(ioc->pid, SIGTERM);
	201	} else if (step == 1) {
	202	kill(ioc->pid, SIGKILL);
	203	} else {
	204	error_setg(errp,
	205	"Process %llu refused to die",
	206	(unsigned long long)ioc->pid);
	207	return -1;
	208	}
0c0a55b2	209	step++;
195e14d0 DB	210	usleep(10 * 1000);
	211	goto rewait;
	212	}
	213
	214	return 0;
	215	}
	216	#endif /* ! WIN32 */
	217
	218
	219	static void qio_channel_command_init(Object *obj)
	220	{
	221	QIOChannelCommand *ioc = QIO_CHANNEL_COMMAND(obj);
	222	ioc->readfd = -1;
	223	ioc->writefd = -1;
	224	ioc->pid = -1;
	225	}
	226
	227	static void qio_channel_command_finalize(Object *obj)
	228	{
	229	QIOChannelCommand *ioc = QIO_CHANNEL_COMMAND(obj);
	230	if (ioc->readfd != -1) {
	231	close(ioc->readfd);
195e14d0	232	}
e155494c DB	233	if (ioc->writefd != -1 &&
e155494c DB	234	ioc->writefd != ioc->readfd) {
195e14d0	235	close(ioc->writefd);
195e14d0	236	}
e155494c	237	ioc->writefd = ioc->readfd = -1;
195e14d0 DB	238	if (ioc->pid > 0) {
	239	#ifndef WIN32
	240	qio_channel_command_abort(ioc, NULL);
	241	#endif
	242	}
	243	}
	244
	245
	246	static ssize_t qio_channel_command_readv(QIOChannel *ioc,
	247	const struct iovec *iov,
	248	size_t niov,
	249	int **fds,
	250	size_t *nfds,
	251	Error **errp)
	252	{
	253	QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
	254	ssize_t ret;
	255
	256	retry:
	257	ret = readv(cioc->readfd, iov, niov);
	258	if (ret < 0) {
30fd3e27	259	if (errno == EAGAIN) {
195e14d0 DB	260	return QIO_CHANNEL_ERR_BLOCK;
	261	}
	262	if (errno == EINTR) {
	263	goto retry;
	264	}
	265
	266	error_setg_errno(errp, errno,
	267	"Unable to read from command");
	268	return -1;
	269	}
	270
	271	return ret;
	272	}
	273
	274	static ssize_t qio_channel_command_writev(QIOChannel *ioc,
	275	const struct iovec *iov,
	276	size_t niov,
	277	int *fds,
	278	size_t nfds,
	279	Error **errp)
	280	{
	281	QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
	282	ssize_t ret;
	283
	284	retry:
	285	ret = writev(cioc->writefd, iov, niov);
	286	if (ret <= 0) {
30fd3e27	287	if (errno == EAGAIN) {
195e14d0 DB	288	return QIO_CHANNEL_ERR_BLOCK;
	289	}
	290	if (errno == EINTR) {
	291	goto retry;
	292	}
	293	error_setg_errno(errp, errno, "%s",
	294	"Unable to write to command");
	295	return -1;
	296	}
	297	return ret;
	298	}
	299
	300	static int qio_channel_command_set_blocking(QIOChannel *ioc,
	301	bool enabled,
	302	Error **errp)
	303	{
17fc1245 MAL	304	#ifdef WIN32
	305	/* command spawn is not supported on win32 */
	306	g_assert_not_reached();
	307	#else
195e14d0 DB	308	QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
195e14d0 DB	309
17fc1245 MAL	310	if (!g_unix_set_fd_nonblocking(cioc->writefd, !enabled, NULL) \|\|
	311	!g_unix_set_fd_nonblocking(cioc->readfd, !enabled, NULL)) {
	312	error_setg_errno(errp, errno, "Failed to set FD nonblocking");
	313	return -1;
195e14d0	314	}
17fc1245	315	#endif
195e14d0 DB	316	return 0;
	317	}
	318
	319
	320	static int qio_channel_command_close(QIOChannel *ioc,
	321	Error **errp)
	322	{
	323	QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
	324	int rv = 0;
fe823b6f TH	325	#ifndef WIN32
	326	pid_t wp;
	327	#endif
195e14d0 DB	328
	329	/* We close FDs before killing, because that
	330	* gives a better chance of clean shutdown
	331	*/
e155494c DB	332	if (cioc->readfd != -1 &&
e155494c DB	333	close(cioc->readfd) < 0) {
195e14d0 DB	334	rv = -1;
195e14d0 DB	335	}
e155494c DB	336	if (cioc->writefd != -1 &&
	337	cioc->writefd != cioc->readfd &&
	338	close(cioc->writefd) < 0) {
195e14d0 DB	339	rv = -1;
195e14d0 DB	340	}
e155494c	341	cioc->writefd = cioc->readfd = -1;
fe823b6f	342
195e14d0	343	#ifndef WIN32
fe823b6f TH	344	do {
	345	wp = waitpid(cioc->pid, NULL, 0);
	346	} while (wp == (pid_t)-1 && errno == EINTR);
	347	if (wp == (pid_t)-1) {
	348	error_setg_errno(errp, errno, "Failed to wait for pid %llu",
	349	(unsigned long long)cioc->pid);
195e14d0 DB	350	return -1;
	351	}
	352	#endif
fe823b6f	353
195e14d0 DB	354	if (rv < 0) {
	355	error_setg_errno(errp, errno, "%s",
	356	"Unable to close command");
	357	}
	358	return rv;
	359	}
	360
	361
bf88c124 PB	362	static void qio_channel_command_set_aio_fd_handler(QIOChannel *ioc,
	363	AioContext *ctx,
	364	IOHandler *io_read,
	365	IOHandler *io_write,
	366	void *opaque)
	367	{
	368	QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
826cc324 SH	369	aio_set_fd_handler(ctx, cioc->readfd, false,
	370	io_read, NULL, NULL, NULL, opaque);
	371	aio_set_fd_handler(ctx, cioc->writefd, false,
	372	NULL, io_write, NULL, NULL, opaque);
bf88c124 PB	373	}
	374
	375
195e14d0 DB	376	static GSource qio_channel_command_create_watch(QIOChannel ioc,
	377	GIOCondition condition)
	378	{
	379	QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
	380	return qio_channel_create_fd_pair_watch(ioc,
	381	cioc->readfd,
	382	cioc->writefd,
	383	condition);
	384	}
	385
	386
	387	static void qio_channel_command_class_init(ObjectClass *klass,
	388	void *class_data G_GNUC_UNUSED)
	389	{
	390	QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
	391
	392	ioc_klass->io_writev = qio_channel_command_writev;
	393	ioc_klass->io_readv = qio_channel_command_readv;
	394	ioc_klass->io_set_blocking = qio_channel_command_set_blocking;
	395	ioc_klass->io_close = qio_channel_command_close;
	396	ioc_klass->io_create_watch = qio_channel_command_create_watch;
bf88c124	397	ioc_klass->io_set_aio_fd_handler = qio_channel_command_set_aio_fd_handler;
195e14d0 DB	398	}
	399
	400	static const TypeInfo qio_channel_command_info = {
	401	.parent = TYPE_QIO_CHANNEL,
	402	.name = TYPE_QIO_CHANNEL_COMMAND,
	403	.instance_size = sizeof(QIOChannelCommand),
	404	.instance_init = qio_channel_command_init,
	405	.instance_finalize = qio_channel_command_finalize,
	406	.class_init = qio_channel_command_class_init,
	407	};
	408
	409	static void qio_channel_command_register_types(void)
	410	{
	411	type_register_static(&qio_channel_command_info);
	412	}
	413
	414	type_init(qio_channel_command_register_types);