mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-07-12 21:05:48 +00:00
2ed6cc7bec
Not all applications have an existing event loop they need
to integrate with. Forcing them to implement the libvirt
event loop integration APIs is an undue burden. This just
exposes our simple poll() based implementation for apps
to use. So instead of calling
virEventRegister(....callbacks...)
The app would call
virEventRegisterDefaultImpl()
And then have a thread somewhere calling
static bool quit = false;
....
while (!quit)
virEventRunDefaultImpl()
* daemon/libvirtd.c, tools/console.c,
tools/virsh.c: Convert to public event loop APIs
* include/libvirt/libvirt.h.in, src/libvirt_private.syms: Add
virEventRegisterDefaultImpl and virEventRunDefaultImpl
* src/util/event.c: Implement virEventRegisterDefaultImpl
and virEventRunDefaultImpl using poll() event loop
* src/util/event_poll.c: Add full error reporting
* src/util/virterror.c, include/libvirt/virterror.h: Add
VIR_FROM_EVENTS
382 lines
11 KiB
C
382 lines
11 KiB
C
/*
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* console.c: A dumb serial console client
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*
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* Copyright (C) 2007, 2008, 2010 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 2.1 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Daniel Berrange <berrange@redhat.com>
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*/
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#include <config.h>
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#ifndef WIN32
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# include <stdio.h>
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# include <sys/types.h>
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# include <sys/stat.h>
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# include <fcntl.h>
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# include <termios.h>
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# include <poll.h>
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# include <string.h>
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# include <errno.h>
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# include <unistd.h>
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# include <signal.h>
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# include "internal.h"
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# include "console.h"
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# include "logging.h"
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# include "util.h"
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# include "files.h"
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# include "memory.h"
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# include "virterror_internal.h"
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# include "event.h"
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/* ie Ctrl-] as per telnet */
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# define CTRL_CLOSE_BRACKET '\35'
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# define VIR_FROM_THIS VIR_FROM_NONE
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struct virConsoleBuffer {
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size_t length;
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size_t offset;
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char *data;
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};
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typedef struct virConsole virConsole;
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typedef virConsole *virConsolePtr;
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struct virConsole {
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virStreamPtr st;
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bool quit;
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int stdinWatch;
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int stdoutWatch;
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struct virConsoleBuffer streamToTerminal;
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struct virConsoleBuffer terminalToStream;
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};
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static int got_signal = 0;
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static void do_signal(int sig ATTRIBUTE_UNUSED) {
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got_signal = 1;
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}
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# ifndef HAVE_CFMAKERAW
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static void
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cfmakeraw (struct termios *attr)
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{
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attr->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
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| INLCR | IGNCR | ICRNL | IXON);
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attr->c_oflag &= ~OPOST;
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attr->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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attr->c_cflag &= ~(CSIZE | PARENB);
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attr->c_cflag |= CS8;
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}
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# endif /* !HAVE_CFMAKERAW */
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static void
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virConsoleShutdown(virConsolePtr con)
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{
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con->quit = true;
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virStreamEventRemoveCallback(con->st);
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if (con->stdinWatch != -1)
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virEventRemoveHandle(con->stdinWatch);
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if (con->stdinWatch != -1)
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virEventRemoveHandle(con->stdoutWatch);
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con->stdinWatch = -1;
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con->stdoutWatch = -1;
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}
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static void
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virConsoleEventOnStream(virStreamPtr st,
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int events, void *opaque)
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{
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virConsolePtr con = opaque;
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if (events & VIR_STREAM_EVENT_READABLE) {
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size_t avail = con->streamToTerminal.length -
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con->streamToTerminal.offset;
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int got;
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if (avail < 1024) {
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if (VIR_REALLOC_N(con->streamToTerminal.data,
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con->streamToTerminal.length + 1024) < 0) {
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virReportOOMError();
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virConsoleShutdown(con);
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return;
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}
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con->streamToTerminal.length += 1024;
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avail += 1024;
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}
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got = virStreamRecv(st,
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con->streamToTerminal.data +
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con->streamToTerminal.offset,
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avail);
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if (got == -2)
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return; /* blocking */
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if (got <= 0) {
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virConsoleShutdown(con);
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return;
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}
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con->streamToTerminal.offset += got;
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if (con->streamToTerminal.offset)
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virEventUpdateHandle(con->stdoutWatch,
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VIR_EVENT_HANDLE_WRITABLE);
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}
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if (events & VIR_STREAM_EVENT_WRITABLE &&
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con->terminalToStream.offset) {
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ssize_t done;
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size_t avail;
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done = virStreamSend(con->st,
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con->terminalToStream.data,
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con->terminalToStream.offset);
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if (done == -2)
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return; /* blocking */
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if (done < 0) {
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virConsoleShutdown(con);
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return;
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}
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memmove(con->terminalToStream.data,
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con->terminalToStream.data + done,
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con->terminalToStream.offset - done);
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con->terminalToStream.offset -= done;
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avail = con->terminalToStream.length - con->terminalToStream.offset;
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if (avail > 1024) {
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if (VIR_REALLOC_N(con->terminalToStream.data,
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con->terminalToStream.offset + 1024) < 0)
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{}
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con->terminalToStream.length = con->terminalToStream.offset + 1024;
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}
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}
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if (!con->terminalToStream.offset)
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virStreamEventUpdateCallback(con->st,
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VIR_STREAM_EVENT_READABLE);
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if (events & VIR_STREAM_EVENT_ERROR ||
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events & VIR_STREAM_EVENT_HANGUP) {
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virConsoleShutdown(con);
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}
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}
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static void
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virConsoleEventOnStdin(int watch ATTRIBUTE_UNUSED,
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int fd ATTRIBUTE_UNUSED,
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int events,
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void *opaque)
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{
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virConsolePtr con = opaque;
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if (events & VIR_EVENT_HANDLE_READABLE) {
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size_t avail = con->terminalToStream.length -
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con->terminalToStream.offset;
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int got;
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if (avail < 1024) {
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if (VIR_REALLOC_N(con->terminalToStream.data,
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con->terminalToStream.length + 1024) < 0) {
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virReportOOMError();
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virConsoleShutdown(con);
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return;
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}
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con->terminalToStream.length += 1024;
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avail += 1024;
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}
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got = read(fd,
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con->terminalToStream.data +
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con->terminalToStream.offset,
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avail);
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if (got < 0) {
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if (errno != EAGAIN) {
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virConsoleShutdown(con);
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}
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return;
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}
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if (got == 0) {
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virConsoleShutdown(con);
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return;
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}
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if (con->terminalToStream.data[con->terminalToStream.offset] == CTRL_CLOSE_BRACKET) {
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virConsoleShutdown(con);
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return;
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}
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con->terminalToStream.offset += got;
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if (con->terminalToStream.offset)
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virStreamEventUpdateCallback(con->st,
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VIR_STREAM_EVENT_READABLE |
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VIR_STREAM_EVENT_WRITABLE);
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}
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if (events & VIR_EVENT_HANDLE_ERROR ||
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events & VIR_EVENT_HANDLE_HANGUP) {
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virConsoleShutdown(con);
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}
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}
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static void
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virConsoleEventOnStdout(int watch ATTRIBUTE_UNUSED,
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int fd,
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int events,
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void *opaque)
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{
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virConsolePtr con = opaque;
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if (events & VIR_EVENT_HANDLE_WRITABLE &&
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con->streamToTerminal.offset) {
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ssize_t done;
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size_t avail;
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done = write(fd,
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con->streamToTerminal.data,
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con->streamToTerminal.offset);
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if (done < 0) {
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if (errno != EAGAIN) {
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virConsoleShutdown(con);
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}
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return;
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}
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memmove(con->streamToTerminal.data,
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con->streamToTerminal.data + done,
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con->streamToTerminal.offset - done);
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con->streamToTerminal.offset -= done;
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avail = con->streamToTerminal.length - con->streamToTerminal.offset;
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if (avail > 1024) {
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if (VIR_REALLOC_N(con->streamToTerminal.data,
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con->streamToTerminal.offset + 1024) < 0)
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{}
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con->streamToTerminal.length = con->streamToTerminal.offset + 1024;
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}
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}
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if (!con->streamToTerminal.offset)
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virEventUpdateHandle(con->stdoutWatch, 0);
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if (events & VIR_EVENT_HANDLE_ERROR ||
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events & VIR_EVENT_HANDLE_HANGUP) {
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virConsoleShutdown(con);
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}
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}
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int vshRunConsole(virDomainPtr dom, const char *devname)
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{
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int ret = -1;
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struct termios ttyattr, rawattr;
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void (*old_sigquit)(int);
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void (*old_sigterm)(int);
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void (*old_sigint)(int);
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void (*old_sighup)(int);
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void (*old_sigpipe)(int);
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virConsolePtr con = NULL;
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/* Put STDIN into raw mode so that stuff typed
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does not echo to the screen (the TTY reads will
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result in it being echoed back already), and
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also ensure Ctrl-C, etc is blocked, and misc
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other bits */
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if (tcgetattr(STDIN_FILENO, &ttyattr) < 0) {
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VIR_ERROR(_("unable to get tty attributes: %s"),
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strerror(errno));
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return -1;
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}
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rawattr = ttyattr;
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cfmakeraw(&rawattr);
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &rawattr) < 0) {
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VIR_ERROR(_("unable to set tty attributes: %s"),
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strerror(errno));
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goto resettty;
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}
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/* Trap all common signals so that we can safely restore
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the original terminal settings on STDIN before the
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process exits - people don't like being left with a
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messed up terminal ! */
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old_sigquit = signal(SIGQUIT, do_signal);
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old_sigterm = signal(SIGTERM, do_signal);
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old_sigint = signal(SIGINT, do_signal);
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old_sighup = signal(SIGHUP, do_signal);
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old_sigpipe = signal(SIGPIPE, do_signal);
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got_signal = 0;
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if (VIR_ALLOC(con) < 0) {
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virReportOOMError();
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goto cleanup;
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}
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con->st = virStreamNew(virDomainGetConnect(dom),
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VIR_STREAM_NONBLOCK);
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if (!con->st)
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goto cleanup;
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if (virDomainOpenConsole(dom, devname, con->st, 0) < 0)
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goto cleanup;
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con->stdinWatch = virEventAddHandle(STDIN_FILENO,
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VIR_EVENT_HANDLE_READABLE,
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virConsoleEventOnStdin,
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con,
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NULL);
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con->stdoutWatch = virEventAddHandle(STDOUT_FILENO,
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0,
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virConsoleEventOnStdout,
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con,
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NULL);
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virStreamEventAddCallback(con->st,
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VIR_STREAM_EVENT_READABLE,
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virConsoleEventOnStream,
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con,
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NULL);
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while (!con->quit) {
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if (virEventRunDefaultImpl() < 0)
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break;
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}
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ret = 0;
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cleanup:
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if (con) {
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if (con->st)
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virStreamFree(con->st);
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VIR_FREE(con);
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}
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/* Restore original signal handlers */
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signal(SIGPIPE, old_sigpipe);
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signal(SIGHUP, old_sighup);
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signal(SIGINT, old_sigint);
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signal(SIGTERM, old_sigterm);
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signal(SIGQUIT, old_sigquit);
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resettty:
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/* Put STDIN back into the (sane?) state we found
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it in before starting */
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &ttyattr);
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return ret;
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}
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#endif /* !WIN32 */
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