[mirror_qemu.git] / chardev / char-pty.c

/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "chardev/char.h"
#include "io/channel-file.h"
#include "qemu/sockets.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/qemu-print.h"

#include "chardev/char-io.h"
#include "qom/object.h"

struct PtyChardev {
    Chardev parent;
    QIOChannel *ioc;
    int read_bytes;

    int connected;
    GSource *timer_src;
};
typedef struct PtyChardev PtyChardev;

DECLARE_INSTANCE_CHECKER(PtyChardev, PTY_CHARDEV,
                         TYPE_CHARDEV_PTY)

static void pty_chr_state(Chardev *chr, int connected);

static void pty_chr_timer_cancel(PtyChardev *s)
{
    if (s->timer_src) {
        g_source_destroy(s->timer_src);
        g_source_unref(s->timer_src);
        s->timer_src = NULL;
    }
}

static gboolean pty_chr_timer(gpointer opaque)
{
    struct Chardev *chr = CHARDEV(opaque);
    PtyChardev *s = PTY_CHARDEV(opaque);

    pty_chr_timer_cancel(s);
    if (!s->connected) {
        /* Next poll ... */
        qemu_chr_be_update_read_handlers(chr, chr->gcontext);
    }
    return FALSE;
}

static void pty_chr_rearm_timer(Chardev *chr, int ms)
{
    PtyChardev *s = PTY_CHARDEV(chr);
    char *name;

    pty_chr_timer_cancel(s);
    name = g_strdup_printf("pty-timer-%s", chr->label);
    s->timer_src = qemu_chr_timeout_add_ms(chr, ms, pty_chr_timer, chr);
    g_source_set_name(s->timer_src, name);
    g_free(name);
}

static void pty_chr_update_read_handler(Chardev *chr)
{
    PtyChardev *s = PTY_CHARDEV(chr);
    GPollFD pfd;
    int rc;
    QIOChannelFile *fioc = QIO_CHANNEL_FILE(s->ioc);

    pfd.fd = fioc->fd;
    pfd.events = G_IO_OUT;
    pfd.revents = 0;
    rc = RETRY_ON_EINTR(g_poll(&pfd, 1, 0));
    assert(rc >= 0);

    if (pfd.revents & G_IO_HUP) {
        pty_chr_state(chr, 0);
    } else {
        pty_chr_state(chr, 1);
    }
}

static int char_pty_chr_write(Chardev *chr, const uint8_t *buf, int len)
{
    PtyChardev *s = PTY_CHARDEV(chr);
    GPollFD pfd;
    int rc;

    if (s->connected) {
        return io_channel_send(s->ioc, buf, len);
    }

    /*
     * The other side might already be re-connected, but the timer might
     * not have fired yet. So let's check here whether we can write again:
     */
    pfd.fd = QIO_CHANNEL_FILE(s->ioc)->fd;
    pfd.events = G_IO_OUT;
    pfd.revents = 0;
    rc = RETRY_ON_EINTR(g_poll(&pfd, 1, 0));
    g_assert(rc >= 0);
    if (!(pfd.revents & G_IO_HUP) && (pfd.revents & G_IO_OUT)) {
        io_channel_send(s->ioc, buf, len);
    }

    return len;
}

static GSource *pty_chr_add_watch(Chardev *chr, GIOCondition cond)
{
    PtyChardev *s = PTY_CHARDEV(chr);
    if (!s->connected) {
        return NULL;
    }
    return qio_channel_create_watch(s->ioc, cond);
}

static int pty_chr_read_poll(void *opaque)
{
    Chardev *chr = CHARDEV(opaque);
    PtyChardev *s = PTY_CHARDEV(opaque);

    s->read_bytes = qemu_chr_be_can_write(chr);
    return s->read_bytes;
}

static gboolean pty_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
{
    Chardev *chr = CHARDEV(opaque);
    PtyChardev *s = PTY_CHARDEV(opaque);
    gsize len;
    uint8_t buf[CHR_READ_BUF_LEN];
    ssize_t ret;

    len = sizeof(buf);
    if (len > s->read_bytes) {
        len = s->read_bytes;
    }
    if (len == 0) {
        return TRUE;
    }
    ret = qio_channel_read(s->ioc, (char *)buf, len, NULL);
    if (ret <= 0) {
        pty_chr_state(chr, 0);
        return FALSE;
    } else {
        pty_chr_state(chr, 1);
        qemu_chr_be_write(chr, buf, ret);
    }
    return TRUE;
}

static void pty_chr_state(Chardev *chr, int connected)
{
    PtyChardev *s = PTY_CHARDEV(chr);

    if (!connected) {
        remove_fd_in_watch(chr);
        s->connected = 0;
        /* (re-)connect poll interval for idle guests: once per second.
         * We check more frequently in case the guests sends data to
         * the virtual device linked to our pty. */
        pty_chr_rearm_timer(chr, 1000);
    } else {
        pty_chr_timer_cancel(s);
        if (!s->connected) {
            s->connected = 1;
            qemu_chr_be_event(chr, CHR_EVENT_OPENED);
        }
        if (!chr->gsource) {
            chr->gsource = io_add_watch_poll(chr, s->ioc,
                                               pty_chr_read_poll,
                                               pty_chr_read,
                                               chr, chr->gcontext);
        }
    }
}

static void char_pty_finalize(Object *obj)
{
    Chardev *chr = CHARDEV(obj);
    PtyChardev *s = PTY_CHARDEV(obj);

    pty_chr_state(chr, 0);
    object_unref(OBJECT(s->ioc));
    pty_chr_timer_cancel(s);
    qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
}

#if defined HAVE_PTY_H
# include <pty.h>
#elif defined CONFIG_BSD
# include <termios.h>
# if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
#  include <libutil.h>
# else
#  include <util.h>
# endif
#elif defined CONFIG_SOLARIS
# include <termios.h>
# include <stropts.h>
#else
# include <termios.h>
#endif

#ifdef __sun__

#if !defined(HAVE_OPENPTY)
/* Once illumos has openpty(), this is going to be removed. */
static int openpty(int *amaster, int *aslave, char *name,
                   struct termios *termp, struct winsize *winp)
{
    const char *slave;
    int mfd = -1, sfd = -1;

    *amaster = *aslave = -1;

    mfd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
    if (mfd < 0) {
        goto err;
    }

    if (grantpt(mfd) == -1 || unlockpt(mfd) == -1) {
        goto err;
    }

    if ((slave = ptsname(mfd)) == NULL) {
        goto err;
    }

    if ((sfd = open(slave, O_RDONLY | O_NOCTTY)) == -1) {
        goto err;
    }

    if (ioctl(sfd, I_PUSH, "ptem") == -1 ||
        (termp != NULL && tcgetattr(sfd, termp) < 0)) {
        goto err;
    }

    *amaster = mfd;
    *aslave = sfd;

    if (winp) {
        ioctl(sfd, TIOCSWINSZ, winp);
    }

    return 0;

err:
    if (sfd != -1) {
        close(sfd);
    }
    close(mfd);
    return -1;
}
#endif

static void cfmakeraw (struct termios *termios_p)
{
    termios_p->c_iflag &=
        ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
    termios_p->c_oflag &= ~OPOST;
    termios_p->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
    termios_p->c_cflag &= ~(CSIZE | PARENB);
    termios_p->c_cflag |= CS8;

    termios_p->c_cc[VMIN] = 0;
    termios_p->c_cc[VTIME] = 0;
}
#endif

/* like openpty() but also makes it raw; return master fd */
static int qemu_openpty_raw(int *aslave, char *pty_name)
{
    int amaster;
    struct termios tty;
#if defined(__OpenBSD__) || defined(__DragonFly__)
    char pty_buf[PATH_MAX];
#define q_ptsname(x) pty_buf
#else
    char *pty_buf = NULL;
#define q_ptsname(x) ptsname(x)
#endif

    if (openpty(&amaster, aslave, pty_buf, NULL, NULL) < 0) {
        return -1;
    }

    /* Set raw attributes on the pty. */
    tcgetattr(*aslave, &tty);
    cfmakeraw(&tty);
    tcsetattr(*aslave, TCSAFLUSH, &tty);

    if (pty_name) {
        strcpy(pty_name, q_ptsname(amaster));
    }

    return amaster;
}

static void char_pty_open(Chardev *chr,
                          ChardevBackend *backend,
                          bool *be_opened,
                          Error **errp)
{
    PtyChardev *s;
    int master_fd, slave_fd;
    char pty_name[PATH_MAX];
    char *name;

    master_fd = qemu_openpty_raw(&slave_fd, pty_name);
    if (master_fd < 0) {
        error_setg_errno(errp, errno, "Failed to create PTY");
        return;
    }

    close(slave_fd);
    if (!g_unix_set_fd_nonblocking(master_fd, true, NULL)) {
        error_setg_errno(errp, errno, "Failed to set FD nonblocking");
        return;
    }

    chr->filename = g_strdup_printf("pty:%s", pty_name);
    qemu_printf("char device redirected to %s (label %s)\n",
                pty_name, chr->label);

    s = PTY_CHARDEV(chr);
    s->ioc = QIO_CHANNEL(qio_channel_file_new_fd(master_fd));
    name = g_strdup_printf("chardev-pty-%s", chr->label);
    qio_channel_set_name(s->ioc, name);
    g_free(name);
    s->timer_src = NULL;
    *be_opened = false;
}

static void char_pty_class_init(ObjectClass *oc, void *data)
{
    ChardevClass *cc = CHARDEV_CLASS(oc);

    cc->open = char_pty_open;
    cc->chr_write = char_pty_chr_write;
    cc->chr_update_read_handler = pty_chr_update_read_handler;
    cc->chr_add_watch = pty_chr_add_watch;
}

static const TypeInfo char_pty_type_info = {
    .name = TYPE_CHARDEV_PTY,
    .parent = TYPE_CHARDEV,
    .instance_size = sizeof(PtyChardev),
    .instance_finalize = char_pty_finalize,
    .class_init = char_pty_class_init,
};

static void register_types(void)
{
    type_register_static(&char_pty_type_info);
}

type_init(register_types);
Commit	Line	Data
c3b7d620 MAL	1	/*
	2	* QEMU System Emulator
	3	*
	4	* Copyright (c) 2003-2008 Fabrice Bellard
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
0b8fa32f	24
c3b7d620 MAL	25	#include "qemu/osdep.h"
c3b7d620 MAL	26	#include "qapi/error.h"
8228e353	27	#include "chardev/char.h"
c3b7d620 MAL	28	#include "io/channel-file.h"
	29	#include "qemu/sockets.h"
	30	#include "qemu/error-report.h"
0b8fa32f	31	#include "qemu/module.h"
6ade45f2	32	#include "qemu/qemu-print.h"
c3b7d620	33
8228e353	34	#include "chardev/char-io.h"
db1015e9	35	#include "qom/object.h"
c3b7d620	36
db1015e9	37	struct PtyChardev {
c3b7d620 MAL	38	Chardev parent;
	39	QIOChannel *ioc;
	40	int read_bytes;
	41
c3b7d620	42	int connected;
2c716ba1	43	GSource *timer_src;
db1015e9 EH	44	};
db1015e9 EH	45	typedef struct PtyChardev PtyChardev;
c3b7d620	46
8110fa1d EH	47	DECLARE_INSTANCE_CHECKER(PtyChardev, PTY_CHARDEV,
8110fa1d EH	48	TYPE_CHARDEV_PTY)
c3b7d620	49
c3b7d620 MAL	50	static void pty_chr_state(Chardev *chr, int connected);
c3b7d620 MAL	51
4e4b5734 PX	52	static void pty_chr_timer_cancel(PtyChardev *s)
	53	{
	54	if (s->timer_src) {
	55	g_source_destroy(s->timer_src);
	56	g_source_unref(s->timer_src);
	57	s->timer_src = NULL;
	58	}
	59	}
	60
c3b7d620 MAL	61	static gboolean pty_chr_timer(gpointer opaque)
	62	{
	63	struct Chardev *chr = CHARDEV(opaque);
	64	PtyChardev *s = PTY_CHARDEV(opaque);
	65
4e4b5734	66	pty_chr_timer_cancel(s);
c3b7d620 MAL	67	if (!s->connected) {
c3b7d620 MAL	68	/* Next poll ... */
f7ea2038	69	qemu_chr_be_update_read_handlers(chr, chr->gcontext);
c3b7d620	70	}
c3b7d620 MAL	71	return FALSE;
	72	}
	73
c3b7d620 MAL	74	static void pty_chr_rearm_timer(Chardev *chr, int ms)
	75	{
	76	PtyChardev *s = PTY_CHARDEV(chr);
	77	char *name;
	78
2c716ba1 PX	79	pty_chr_timer_cancel(s);
	80	name = g_strdup_printf("pty-timer-%s", chr->label);
	81	s->timer_src = qemu_chr_timeout_add_ms(chr, ms, pty_chr_timer, chr);
	82	g_source_set_name(s->timer_src, name);
c3b7d620 MAL	83	g_free(name);
	84	}
	85
f7ea2038	86	static void pty_chr_update_read_handler(Chardev *chr)
c3b7d620 MAL	87	{
	88	PtyChardev *s = PTY_CHARDEV(chr);
	89	GPollFD pfd;
	90	int rc;
	91	QIOChannelFile *fioc = QIO_CHANNEL_FILE(s->ioc);
	92
	93	pfd.fd = fioc->fd;
	94	pfd.events = G_IO_OUT;
	95	pfd.revents = 0;
37b0b24e	96	rc = RETRY_ON_EINTR(g_poll(&pfd, 1, 0));
c3b7d620 MAL	97	assert(rc >= 0);
	98
	99	if (pfd.revents & G_IO_HUP) {
	100	pty_chr_state(chr, 0);
	101	} else {
	102	pty_chr_state(chr, 1);
	103	}
	104	}
	105
c3b7d620 MAL	106	static int char_pty_chr_write(Chardev chr, const uint8_t buf, int len)
	107	{
	108	PtyChardev *s = PTY_CHARDEV(chr);
4f7689f0 TH	109	GPollFD pfd;
4f7689f0 TH	110	int rc;
c3b7d620	111
4f7689f0 TH	112	if (s->connected) {
4f7689f0 TH	113	return io_channel_send(s->ioc, buf, len);
c3b7d620	114	}
4f7689f0 TH	115
	116	/*
	117	* The other side might already be re-connected, but the timer might
	118	* not have fired yet. So let's check here whether we can write again:
	119	*/
	120	pfd.fd = QIO_CHANNEL_FILE(s->ioc)->fd;
	121	pfd.events = G_IO_OUT;
	122	pfd.revents = 0;
	123	rc = RETRY_ON_EINTR(g_poll(&pfd, 1, 0));
	124	g_assert(rc >= 0);
	125	if (!(pfd.revents & G_IO_HUP) && (pfd.revents & G_IO_OUT)) {
	126	io_channel_send(s->ioc, buf, len);
	127	}
	128
	129	return len;
c3b7d620 MAL	130	}
	131
	132	static GSource pty_chr_add_watch(Chardev chr, GIOCondition cond)
	133	{
	134	PtyChardev *s = PTY_CHARDEV(chr);
	135	if (!s->connected) {
	136	return NULL;
	137	}
	138	return qio_channel_create_watch(s->ioc, cond);
	139	}
	140
	141	static int pty_chr_read_poll(void *opaque)
	142	{
	143	Chardev *chr = CHARDEV(opaque);
	144	PtyChardev *s = PTY_CHARDEV(opaque);
	145
	146	s->read_bytes = qemu_chr_be_can_write(chr);
	147	return s->read_bytes;
	148	}
	149
	150	static gboolean pty_chr_read(QIOChannel chan, GIOCondition cond, void opaque)
	151	{
	152	Chardev *chr = CHARDEV(opaque);
	153	PtyChardev *s = PTY_CHARDEV(opaque);
	154	gsize len;
	155	uint8_t buf[CHR_READ_BUF_LEN];
	156	ssize_t ret;
	157
	158	len = sizeof(buf);
	159	if (len > s->read_bytes) {
	160	len = s->read_bytes;
	161	}
	162	if (len == 0) {
	163	return TRUE;
	164	}
	165	ret = qio_channel_read(s->ioc, (char *)buf, len, NULL);
	166	if (ret <= 0) {
	167	pty_chr_state(chr, 0);
	168	return FALSE;
	169	} else {
	170	pty_chr_state(chr, 1);
	171	qemu_chr_be_write(chr, buf, ret);
	172	}
	173	return TRUE;
	174	}
	175
c3b7d620 MAL	176	static void pty_chr_state(Chardev *chr, int connected)
	177	{
	178	PtyChardev *s = PTY_CHARDEV(chr);
	179
	180	if (!connected) {
b19456dd	181	remove_fd_in_watch(chr);
c3b7d620 MAL	182	s->connected = 0;
	183	/* (re-)connect poll interval for idle guests: once per second.
	184	* We check more frequently in case the guests sends data to
	185	* the virtual device linked to our pty. */
	186	pty_chr_rearm_timer(chr, 1000);
	187	} else {
2c716ba1	188	pty_chr_timer_cancel(s);
c3b7d620	189	if (!s->connected) {
c3b7d620	190	s->connected = 1;
f7ea2038	191	qemu_chr_be_event(chr, CHR_EVENT_OPENED);
c3b7d620	192	}
b19456dd HZ	193	if (!chr->gsource) {
b19456dd HZ	194	chr->gsource = io_add_watch_poll(chr, s->ioc,
c3b7d620 MAL	195	pty_chr_read_poll,
c3b7d620 MAL	196	pty_chr_read,
6bbb6c06	197	chr, chr->gcontext);
c3b7d620 MAL	198	}
	199	}
	200	}
	201
	202	static void char_pty_finalize(Object *obj)
	203	{
	204	Chardev *chr = CHARDEV(obj);
	205	PtyChardev *s = PTY_CHARDEV(obj);
	206
c3b7d620 MAL	207	pty_chr_state(chr, 0);
c3b7d620 MAL	208	object_unref(OBJECT(s->ioc));
2c716ba1	209	pty_chr_timer_cancel(s);
c3b7d620 MAL	210	qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
	211	}
	212
3f6c2e8b MAL	213	#if defined HAVE_PTY_H
	214	# include <pty.h>
	215	#elif defined CONFIG_BSD
	216	# include <termios.h>
	217	# if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__) \|\| defined(__DragonFly__)
	218	# include <libutil.h>
	219	# else
	220	# include <util.h>
	221	# endif
	222	#elif defined CONFIG_SOLARIS
	223	# include <termios.h>
	224	# include <stropts.h>
	225	#else
	226	# include <termios.h>
	227	#endif
	228
	229	#ifdef __sun__
	230
	231	#if !defined(HAVE_OPENPTY)
	232	/* Once illumos has openpty(), this is going to be removed. */
	233	static int openpty(int amaster, int aslave, char *name,
	234	struct termios termp, struct winsize winp)
	235	{
	236	const char *slave;
	237	int mfd = -1, sfd = -1;
	238
	239	amaster = aslave = -1;
	240
	241	mfd = open("/dev/ptmx", O_RDWR \| O_NOCTTY);
	242	if (mfd < 0) {
	243	goto err;
	244	}
	245
	246	if (grantpt(mfd) == -1 \|\| unlockpt(mfd) == -1) {
	247	goto err;
	248	}
	249
	250	if ((slave = ptsname(mfd)) == NULL) {
	251	goto err;
	252	}
	253
	254	if ((sfd = open(slave, O_RDONLY \| O_NOCTTY)) == -1) {
	255	goto err;
	256	}
	257
	258	if (ioctl(sfd, I_PUSH, "ptem") == -1 \|\|
	259	(termp != NULL && tcgetattr(sfd, termp) < 0)) {
	260	goto err;
	261	}
	262
	263	*amaster = mfd;
	264	*aslave = sfd;
	265
	266	if (winp) {
	267	ioctl(sfd, TIOCSWINSZ, winp);
	268	}
	269
	270	return 0;
	271
	272	err:
	273	if (sfd != -1) {
	274	close(sfd);
	275	}
	276	close(mfd);
277	return -1;
278	}
279	#endif
280
281	static void cfmakeraw (struct termios *termios_p)
282	{
283	termios_p->c_iflag &=
284	~(IGNBRK \| BRKINT \| PARMRK \| ISTRIP \| INLCR \| IGNCR \| ICRNL \| IXON);
285	termios_p->c_oflag &= ~OPOST;
286	termios_p->c_lflag &= ~(ECHO \| ECHONL \| ICANON \| ISIG \| IEXTEN);
287	termios_p->c_cflag &= ~(CSIZE \| PARENB);
288	termios_p->c_cflag \|= CS8;
289
290	termios_p->c_cc[VMIN] = 0;
291	termios_p->c_cc[VTIME] = 0;
292	}
293	#endif
294
295	/* like openpty() but also makes it raw; return master fd */
296	static int qemu_openpty_raw(int aslave, char pty_name)
297	{
298	int amaster;
299	struct termios tty;
300	#if defined(__OpenBSD__) \|\| defined(__DragonFly__)
301	char pty_buf[PATH_MAX];
302	#define q_ptsname(x) pty_buf
303	#else
304	char *pty_buf = NULL;
305	#define q_ptsname(x) ptsname(x)
306	#endif
307
308	if (openpty(&amaster, aslave, pty_buf, NULL, NULL) < 0) {
309	return -1;
310	}
311
312	/* Set raw attributes on the pty. */
313	tcgetattr(*aslave, &tty);
314	cfmakeraw(&tty);
315	tcsetattr(*aslave, TCSAFLUSH, &tty);
316
317	if (pty_name) {
318	strcpy(pty_name, q_ptsname(amaster));
319	}
320
321	return amaster;
322	}
323
c3b7d620 MAL	324	static void char_pty_open(Chardev *chr,
	325	ChardevBackend *backend,
	326	bool *be_opened,
	327	Error **errp)
	328	{
	329	PtyChardev *s;
	330	int master_fd, slave_fd;
	331	char pty_name[PATH_MAX];
	332	char *name;
	333
	334	master_fd = qemu_openpty_raw(&slave_fd, pty_name);
	335	if (master_fd < 0) {
	336	error_setg_errno(errp, errno, "Failed to create PTY");
	337	return;
	338	}
	339
	340	close(slave_fd);
b84bb4df MAL	341	if (!g_unix_set_fd_nonblocking(master_fd, true, NULL)) {
	342	error_setg_errno(errp, errno, "Failed to set FD nonblocking");
	343	return;
	344	}
c3b7d620 MAL	345
c3b7d620 MAL	346	chr->filename = g_strdup_printf("pty:%s", pty_name);
6ade45f2 MA	347	qemu_printf("char device redirected to %s (label %s)\n",
6ade45f2 MA	348	pty_name, chr->label);
c3b7d620 MAL	349
	350	s = PTY_CHARDEV(chr);
	351	s->ioc = QIO_CHANNEL(qio_channel_file_new_fd(master_fd));
	352	name = g_strdup_printf("chardev-pty-%s", chr->label);
7d5b0d68	353	qio_channel_set_name(s->ioc, name);
c3b7d620	354	g_free(name);
2c716ba1	355	s->timer_src = NULL;
c3b7d620 MAL	356	*be_opened = false;
	357	}
	358
	359	static void char_pty_class_init(ObjectClass oc, void data)
	360	{
	361	ChardevClass *cc = CHARDEV_CLASS(oc);
	362
	363	cc->open = char_pty_open;
	364	cc->chr_write = char_pty_chr_write;
	365	cc->chr_update_read_handler = pty_chr_update_read_handler;
	366	cc->chr_add_watch = pty_chr_add_watch;
	367	}
	368
	369	static const TypeInfo char_pty_type_info = {
	370	.name = TYPE_CHARDEV_PTY,
	371	.parent = TYPE_CHARDEV,
	372	.instance_size = sizeof(PtyChardev),
	373	.instance_finalize = char_pty_finalize,
	374	.class_init = char_pty_class_init,
	375	};
	376
	377	static void register_types(void)
	378	{
	379	type_register_static(&char_pty_type_info);
	380	}
	381
	382	type_init(register_types);