char: move CharBackend handling in char-fe unit

Move all the frontend struct and methods to a seperate unit. This avoids
accidentally mixing backend and frontend calls, and helps with readabilty.

Make qemu_chr_replay() a macro shared by both char and char-fe.

Export qemu_chr_write(), and use a macro for qemu_chr_write_all()

(nb: yes, CharBackend is for char frontend :)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

1 files changed, 1 insertions, 342 deletions

diff --git a/chardev/char.c b/chardev/char.c
index c9e46f00f0..8ea7b5777a 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -22,7 +22,6 @@
  * THE SOFTWARE.
  */
 #include "qemu/osdep.h"
-#include "qemu-common.h"
 #include "qemu/cutils.h"
 #include "monitor/monitor.h"
 #include "sysemu/sysemu.h"
@@ -35,9 +34,6 @@
 #include "qemu/help_option.h"
 
 #include "chardev/char-mux.h"
-#include "chardev/char-io.h"
-#include "chardev/char-parallel.h"
-#include "chardev/char-serial.h"
 
 /***********************************************************/
 /* character device */
@@ -129,13 +125,7 @@ static int qemu_chr_fe_write_buffer(Chardev *s,
     return res;
 }
 
-static bool qemu_chr_replay(Chardev *chr)
-{
-    return qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_REPLAY);
-}
-
-static int qemu_chr_write(Chardev *s, const uint8_t *buf, int len,
-                          bool write_all)
+int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool write_all)
 {
     int offset = 0;
     int res;
@@ -159,94 +149,6 @@ static int qemu_chr_write(Chardev *s, const uint8_t *buf, int len,
     return offset;
 }
 
-int qemu_chr_write_all(Chardev *s, const uint8_t *buf, int len)
-{
-    return qemu_chr_write(s, buf, len, true);
-}
-
-int qemu_chr_fe_write(CharBackend *be, const uint8_t *buf, int len)
-{
-    Chardev *s = be->chr;
-
-    if (!s) {
-        return 0;
-    }
-
-    return qemu_chr_write(s, buf, len, false);
-}
-
-int qemu_chr_fe_write_all(CharBackend *be, const uint8_t *buf, int len)
-{
-    Chardev *s = be->chr;
-
-    if (!s) {
-        return 0;
-    }
-
-    return qemu_chr_write(s, buf, len, true);
-}
-
-int qemu_chr_fe_read_all(CharBackend *be, uint8_t *buf, int len)
-{
-    Chardev *s = be->chr;
-    int offset = 0, counter = 10;
-    int res;
-
-    if (!s || !CHARDEV_GET_CLASS(s)->chr_sync_read) {
-        return 0;
-    }
-
-    if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) {
-        return replay_char_read_all_load(buf);
-    }
-
-    while (offset < len) {
-    retry:
-        res = CHARDEV_GET_CLASS(s)->chr_sync_read(s, buf + offset,
-                                                  len - offset);
-        if (res == -1 && errno == EAGAIN) {
-            g_usleep(100);
-            goto retry;
-        }
-
-        if (res == 0) {
-            break;
-        }
-
-        if (res < 0) {
-            if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
-                replay_char_read_all_save_error(res);
-            }
-            return res;
-        }
-
-        offset += res;
-
-        if (!counter--) {
-            break;
-        }
-    }
-
-    if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
-        replay_char_read_all_save_buf(buf, offset);
-    }
-    return offset;
-}
-
-int qemu_chr_fe_ioctl(CharBackend *be, int cmd, void *arg)
-{
-    Chardev *s = be->chr;
-    int res;
-
-    if (!s || !CHARDEV_GET_CLASS(s)->chr_ioctl || qemu_chr_replay(s)) {
-        res = -ENOTSUP;
-    } else {
-        res = CHARDEV_GET_CLASS(s)->chr_ioctl(s, cmd, arg);
-    }
-
-    return res;
-}
-
 int qemu_chr_be_can_write(Chardev *s)
 {
     CharBackend *be = s->be;
@@ -279,75 +181,12 @@ void qemu_chr_be_write(Chardev *s, uint8_t *buf, int len)
     }
 }
 
-int qemu_chr_fe_get_msgfd(CharBackend *be)
-{
-    Chardev *s = be->chr;
-    int fd;
-    int res = (qemu_chr_fe_get_msgfds(be, &fd, 1) == 1) ? fd : -1;
-    if (s && qemu_chr_replay(s)) {
-        error_report("Replay: get msgfd is not supported "
-                     "for serial devices yet");
-        exit(1);
-    }
-    return res;
-}
-
-int qemu_chr_fe_get_msgfds(CharBackend *be, int *fds, int len)
-{
-    Chardev *s = be->chr;
-
-    if (!s) {
-        return -1;
-    }
-
-    return CHARDEV_GET_CLASS(s)->get_msgfds ?
-        CHARDEV_GET_CLASS(s)->get_msgfds(s, fds, len) : -1;
-}
-
-int qemu_chr_fe_set_msgfds(CharBackend *be, int *fds, int num)
-{
-    Chardev *s = be->chr;
-
-    if (!s) {
-        return -1;
-    }
-
-    return CHARDEV_GET_CLASS(s)->set_msgfds ?
-        CHARDEV_GET_CLASS(s)->set_msgfds(s, fds, num) : -1;
-}
-
 int qemu_chr_add_client(Chardev *s, int fd)
 {
     return CHARDEV_GET_CLASS(s)->chr_add_client ?
         CHARDEV_GET_CLASS(s)->chr_add_client(s, fd) : -1;
 }
 
-void qemu_chr_fe_accept_input(CharBackend *be)
-{
-    Chardev *s = be->chr;
-
-    if (!s) {
-        return;
-    }
-
-    if (CHARDEV_GET_CLASS(s)->chr_accept_input) {
-        CHARDEV_GET_CLASS(s)->chr_accept_input(s);
-    }
-    qemu_notify_event();
-}
-
-void qemu_chr_fe_printf(CharBackend *be, const char *fmt, ...)
-{
-    char buf[CHR_READ_BUF_LEN];
-    va_list ap;
-    va_start(ap, fmt);
-    vsnprintf(buf, sizeof(buf), fmt, ap);
-    /* XXX this blocks entire thread. Rewrite to use
-     * qemu_chr_fe_write and background I/O callbacks */
-    qemu_chr_fe_write_all(be, (uint8_t *)buf, strlen(buf));
-    va_end(ap);
-}
-
 static void qemu_char_open(Chardev *chr, ChardevBackend *backend,
                            bool *be_opened, Error **errp)
 {
@@ -459,40 +298,6 @@ static Notifier muxes_realize_notify = {
     .notify = muxes_realize_done,
 };
 
-Chardev *qemu_chr_fe_get_driver(CharBackend *be)
-{
-    return be->chr;
-}
-
-bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Error **errp)
-{
-    int tag = 0;
-
-    if (CHARDEV_IS_MUX(s)) {
-        MuxChardev *d = MUX_CHARDEV(s);
-
-        if (d->mux_cnt >= MAX_MUX) {
-            goto unavailable;
-        }
-
-        d->backends[d->mux_cnt] = b;
-        tag = d->mux_cnt++;
-    } else if (s->be) {
-        goto unavailable;
-    } else {
-        s->be = b;
-    }
-
-    b->fe_open = false;
-    b->tag = tag;
-    b->chr = s;
-    return true;
-
-unavailable:
-    error_setg(errp, QERR_DEVICE_IN_USE, s->label);
-    return false;
-}
-
 static bool qemu_chr_is_busy(Chardev *s)
 {
     if (CHARDEV_IS_MUX(s)) {
@@ -503,84 +308,6 @@ static bool qemu_chr_is_busy(Chardev *s)
     }
 }
 
-void qemu_chr_fe_deinit(CharBackend *b)
-{
-    assert(b);
-
-    if (b->chr) {
-        qemu_chr_fe_set_handlers(b, NULL, NULL, NULL, NULL, NULL, true);
-        if (b->chr->be == b) {
-            b->chr->be = NULL;
-        }
-        if (CHARDEV_IS_MUX(b->chr)) {
-            MuxChardev *d = MUX_CHARDEV(b->chr);
-            d->backends[b->tag] = NULL;
-        }
-        b->chr = NULL;
-    }
-}
-
-void qemu_chr_fe_set_handlers(CharBackend *b,
-                              IOCanReadHandler *fd_can_read,
-                              IOReadHandler *fd_read,
-                              IOEventHandler *fd_event,
-                              void *opaque,
-                              GMainContext *context,
-                              bool set_open)
-{
-    Chardev *s;
-    ChardevClass *cc;
-    int fe_open;
-
-    s = b->chr;
-    if (!s) {
-        return;
-    }
-
-    cc = CHARDEV_GET_CLASS(s);
-    if (!opaque && !fd_can_read && !fd_read && !fd_event) {
-        fe_open = 0;
-        remove_fd_in_watch(s);
-    } else {
-        fe_open = 1;
-    }
-    b->chr_can_read = fd_can_read;
-    b->chr_read = fd_read;
-    b->chr_event = fd_event;
-    b->opaque = opaque;
-    if (cc->chr_update_read_handler) {
-        cc->chr_update_read_handler(s, context);
-    }
-
-    if (set_open) {
-        qemu_chr_fe_set_open(b, fe_open);
-    }
-
-    if (fe_open) {
-        qemu_chr_fe_take_focus(b);
-        /* We're connecting to an already opened device, so let's make sure we
-           also get the open event */
-        if (s->be_open) {
-            qemu_chr_be_event(s, CHR_EVENT_OPENED);
-        }
-    }
-
-    if (CHARDEV_IS_MUX(s)) {
-        mux_chr_set_handlers(s, context);
-    }
-}
-
-void qemu_chr_fe_take_focus(CharBackend *b)
-{
-    if (!b->chr) {
-        return;
-    }
-
-    if (CHARDEV_IS_MUX(b->chr)) {
-        mux_set_focus(b->chr, b->tag);
-    }
-}
-
 int qemu_chr_wait_connected(Chardev *chr, Error **errp)
 {
     ChardevClass *cc = CHARDEV_GET_CLASS(chr);
@@ -592,16 +319,6 @@ int qemu_chr_wait_connected(Chardev *chr, Error **errp)
     return 0;
 }
 
-int qemu_chr_fe_wait_connected(CharBackend *be, Error **errp)
-{
-    if (!be->chr) {
-        error_setg(errp, "missing associated backend");
-        return -1;
-    }
-
-    return qemu_chr_wait_connected(be->chr, errp);
-}
-
 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
 {
     char host[65], port[33], width[8], height[8];
@@ -978,64 +695,6 @@ Chardev *qemu_chr_new(const char *label, const char *filename)
     return chr;
 }
 
-void qemu_chr_fe_set_echo(CharBackend *be, bool echo)
-{
-    Chardev *chr = be->chr;
-
-    if (chr && CHARDEV_GET_CLASS(chr)->chr_set_echo) {
-        CHARDEV_GET_CLASS(chr)->chr_set_echo(chr, echo);
-    }
-}
-
-void qemu_chr_fe_set_open(CharBackend *be, int fe_open)
-{
-    Chardev *chr = be->chr;
-
-    if (!chr) {
-        return;
-    }
-
-    if (be->fe_open == fe_open) {
-        return;
-    }
-    be->fe_open = fe_open;
-    if (CHARDEV_GET_CLASS(chr)->chr_set_fe_open) {
-        CHARDEV_GET_CLASS(chr)->chr_set_fe_open(chr, fe_open);
-    }
-}
-
-guint qemu_chr_fe_add_watch(CharBackend *be, GIOCondition cond,
-                            GIOFunc func, void *user_data)
-{
-    Chardev *s = be->chr;
-    GSource *src;
-    guint tag;
-
-    if (!s || CHARDEV_GET_CLASS(s)->chr_add_watch == NULL) {
-        return 0;
-    }
-
-    src = CHARDEV_GET_CLASS(s)->chr_add_watch(s, cond);
-    if (!src) {
-        return 0;
-    }
-
-    g_source_set_callback(src, (GSourceFunc)func, user_data, NULL);
-    tag = g_source_attach(src, NULL);
-    g_source_unref(src);
-
-    return tag;
-}
-
-void qemu_chr_fe_disconnect(CharBackend *be)
-{
-    Chardev *chr = be->chr;
-
-    if (chr && CHARDEV_GET_CLASS(chr)->chr_disconnect) {
-        CHARDEV_GET_CLASS(chr)->chr_disconnect(chr);
-    }
-}
-
 static int qmp_query_chardev_foreach(Object *obj, void *data)
 {
     Chardev *chr = CHARDEV(obj);