387 lines
9.4 KiB
C
387 lines
9.4 KiB
C
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/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "sysemu/replay.h"
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#include "chardev/char-fe.h"
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#include "chardev/char-io.h"
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#include "chardev-internal.h"
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int qemu_chr_fe_write(CharBackend *be, const uint8_t *buf, int len)
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{
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Chardev *s = be->chr;
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if (!s) {
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return 0;
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}
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return qemu_chr_write(s, buf, len, false);
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}
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int qemu_chr_fe_write_all(CharBackend *be, const uint8_t *buf, int len)
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{
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Chardev *s = be->chr;
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if (!s) {
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return 0;
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}
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return qemu_chr_write(s, buf, len, true);
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}
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int qemu_chr_fe_read_all(CharBackend *be, uint8_t *buf, int len)
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{
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Chardev *s = be->chr;
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int offset = 0;
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int res;
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if (!s || !CHARDEV_GET_CLASS(s)->chr_sync_read) {
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return 0;
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}
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if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) {
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return replay_char_read_all_load(buf);
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}
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while (offset < len) {
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retry:
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res = CHARDEV_GET_CLASS(s)->chr_sync_read(s, buf + offset,
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len - offset);
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if (res == -1 && errno == EAGAIN) {
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g_usleep(100);
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goto retry;
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}
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if (res == 0) {
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break;
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}
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if (res < 0) {
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if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
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replay_char_read_all_save_error(res);
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}
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return res;
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}
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offset += res;
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}
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if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
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replay_char_read_all_save_buf(buf, offset);
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}
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return offset;
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}
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int qemu_chr_fe_ioctl(CharBackend *be, int cmd, void *arg)
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{
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Chardev *s = be->chr;
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int res;
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if (!s || !CHARDEV_GET_CLASS(s)->chr_ioctl || qemu_chr_replay(s)) {
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res = -ENOTSUP;
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} else {
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res = CHARDEV_GET_CLASS(s)->chr_ioctl(s, cmd, arg);
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}
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return res;
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}
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int qemu_chr_fe_get_msgfd(CharBackend *be)
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{
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Chardev *s = be->chr;
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int fd;
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int res = (qemu_chr_fe_get_msgfds(be, &fd, 1) == 1) ? fd : -1;
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if (s && qemu_chr_replay(s)) {
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error_report("Replay: get msgfd is not supported "
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"for serial devices yet");
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exit(1);
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}
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return res;
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}
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int qemu_chr_fe_get_msgfds(CharBackend *be, int *fds, int len)
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{
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Chardev *s = be->chr;
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if (!s) {
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return -1;
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}
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return CHARDEV_GET_CLASS(s)->get_msgfds ?
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CHARDEV_GET_CLASS(s)->get_msgfds(s, fds, len) : -1;
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}
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int qemu_chr_fe_set_msgfds(CharBackend *be, int *fds, int num)
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{
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Chardev *s = be->chr;
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if (!s) {
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return -1;
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}
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return CHARDEV_GET_CLASS(s)->set_msgfds ?
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CHARDEV_GET_CLASS(s)->set_msgfds(s, fds, num) : -1;
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}
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void qemu_chr_fe_accept_input(CharBackend *be)
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{
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Chardev *s = be->chr;
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if (!s) {
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return;
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}
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if (CHARDEV_GET_CLASS(s)->chr_accept_input) {
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CHARDEV_GET_CLASS(s)->chr_accept_input(s);
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}
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qemu_notify_event();
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}
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void qemu_chr_fe_printf(CharBackend *be, const char *fmt, ...)
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{
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char buf[CHR_READ_BUF_LEN];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(buf, sizeof(buf), fmt, ap);
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/* XXX this blocks entire thread. Rewrite to use
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* qemu_chr_fe_write and background I/O callbacks */
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qemu_chr_fe_write_all(be, (uint8_t *)buf, strlen(buf));
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va_end(ap);
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}
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Chardev *qemu_chr_fe_get_driver(CharBackend *be)
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{
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/* this is unsafe for the users that support chardev hotswap */
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assert(be->chr_be_change == NULL);
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return be->chr;
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}
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bool qemu_chr_fe_backend_connected(CharBackend *be)
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{
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return !!be->chr;
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}
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bool qemu_chr_fe_backend_open(CharBackend *be)
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{
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return be->chr && be->chr->be_open;
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}
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bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Error **errp)
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{
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int tag = 0;
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if (s) {
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if (CHARDEV_IS_MUX(s)) {
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MuxChardev *d = MUX_CHARDEV(s);
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if (d->mux_cnt >= MAX_MUX) {
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goto unavailable;
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}
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d->backends[d->mux_cnt] = b;
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tag = d->mux_cnt++;
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} else if (s->be) {
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goto unavailable;
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} else {
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s->be = b;
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}
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}
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b->fe_open = false;
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b->tag = tag;
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b->chr = s;
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return true;
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unavailable:
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error_setg(errp, QERR_DEVICE_IN_USE, s->label);
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return false;
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}
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void qemu_chr_fe_deinit(CharBackend *b, bool del)
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{
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assert(b);
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if (b->chr) {
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qemu_chr_fe_set_handlers(b, NULL, NULL, NULL, NULL, NULL, NULL, true);
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if (b->chr->be == b) {
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b->chr->be = NULL;
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}
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if (CHARDEV_IS_MUX(b->chr)) {
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MuxChardev *d = MUX_CHARDEV(b->chr);
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d->backends[b->tag] = NULL;
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}
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if (del) {
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Object *obj = OBJECT(b->chr);
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if (obj->parent) {
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object_unparent(obj);
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} else {
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object_unref(obj);
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}
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}
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b->chr = NULL;
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}
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}
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void qemu_chr_fe_set_handlers_full(CharBackend *b,
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IOCanReadHandler *fd_can_read,
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IOReadHandler *fd_read,
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IOEventHandler *fd_event,
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BackendChangeHandler *be_change,
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void *opaque,
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GMainContext *context,
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bool set_open,
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bool sync_state)
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{
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Chardev *s;
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int fe_open;
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s = b->chr;
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if (!s) {
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return;
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}
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if (!opaque && !fd_can_read && !fd_read && !fd_event) {
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fe_open = 0;
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remove_fd_in_watch(s);
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} else {
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fe_open = 1;
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}
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b->chr_can_read = fd_can_read;
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b->chr_read = fd_read;
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b->chr_event = fd_event;
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b->chr_be_change = be_change;
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b->opaque = opaque;
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qemu_chr_be_update_read_handlers(s, context);
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if (set_open) {
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qemu_chr_fe_set_open(b, fe_open);
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}
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if (fe_open) {
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qemu_chr_fe_take_focus(b);
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/* We're connecting to an already opened device, so let's make sure we
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also get the open event */
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if (sync_state && s->be_open) {
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qemu_chr_be_event(s, CHR_EVENT_OPENED);
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}
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}
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}
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void qemu_chr_fe_set_handlers(CharBackend *b,
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IOCanReadHandler *fd_can_read,
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IOReadHandler *fd_read,
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IOEventHandler *fd_event,
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BackendChangeHandler *be_change,
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void *opaque,
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GMainContext *context,
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bool set_open)
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{
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qemu_chr_fe_set_handlers_full(b, fd_can_read, fd_read, fd_event, be_change,
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opaque, context, set_open,
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true);
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}
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void qemu_chr_fe_take_focus(CharBackend *b)
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{
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if (!b->chr) {
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return;
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}
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if (CHARDEV_IS_MUX(b->chr)) {
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mux_set_focus(b->chr, b->tag);
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}
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}
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int qemu_chr_fe_wait_connected(CharBackend *be, Error **errp)
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{
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if (!be->chr) {
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error_setg(errp, "missing associated backend");
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return -1;
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}
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return qemu_chr_wait_connected(be->chr, errp);
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}
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void qemu_chr_fe_set_echo(CharBackend *be, bool echo)
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{
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Chardev *chr = be->chr;
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if (chr && CHARDEV_GET_CLASS(chr)->chr_set_echo) {
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CHARDEV_GET_CLASS(chr)->chr_set_echo(chr, echo);
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}
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}
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void qemu_chr_fe_set_open(CharBackend *be, int fe_open)
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{
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Chardev *chr = be->chr;
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if (!chr) {
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return;
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}
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if (be->fe_open == fe_open) {
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return;
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}
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be->fe_open = fe_open;
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if (CHARDEV_GET_CLASS(chr)->chr_set_fe_open) {
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CHARDEV_GET_CLASS(chr)->chr_set_fe_open(chr, fe_open);
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}
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}
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guint qemu_chr_fe_add_watch(CharBackend *be, GIOCondition cond,
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GIOFunc func, void *user_data)
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{
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Chardev *s = be->chr;
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GSource *src;
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guint tag;
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if (!s || CHARDEV_GET_CLASS(s)->chr_add_watch == NULL) {
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return 0;
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}
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src = CHARDEV_GET_CLASS(s)->chr_add_watch(s, cond);
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if (!src) {
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return 0;
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}
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g_source_set_callback(src, (GSourceFunc)func, user_data, NULL);
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tag = g_source_attach(src, s->gcontext);
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g_source_unref(src);
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return tag;
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}
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void qemu_chr_fe_disconnect(CharBackend *be)
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{
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Chardev *chr = be->chr;
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if (chr && CHARDEV_GET_CLASS(chr)->chr_disconnect) {
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CHARDEV_GET_CLASS(chr)->chr_disconnect(chr);
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}
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}
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