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vshRunConsole() uses virCondWait() which is a wrapper around pthread_cond_wait(). On FreeBSD, pthread_cond_wait needs mutex to be locked, otherwise it immediately fails with EPERM. On Linux, the behaviour in this case is undefined. So lock the mutex before calling virCondWait().
409 lines
11 KiB
C
409 lines
11 KiB
C
/*
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* virsh-console.c: A dumb serial console client
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*
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* Copyright (C) 2007-2008, 2010-2013 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, see
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* <http://www.gnu.org/licenses/>.
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*
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* Authors:
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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 <c-ctype.h>
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# include "internal.h"
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# include "virsh.h"
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# include "virsh-console.h"
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# include "virlog.h"
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# include "virfile.h"
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# include "viralloc.h"
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# include "virthread.h"
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# include "virerror.h"
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/*
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* Convert given character to control character.
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* Basically, we assume ASCII, and take lower 6 bits.
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*/
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# define CONTROL(c) ((c) ^ 0x40)
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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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virMutex lock;
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virCond cond;
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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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char escapeChar;
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};
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static int got_signal = 0;
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static void
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virConsoleHandleSignal(int sig ATTRIBUTE_UNUSED)
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{
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got_signal = 1;
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}
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static void
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virConsoleShutdown(virConsolePtr con)
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{
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if (con->st) {
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virStreamEventRemoveCallback(con->st);
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virStreamAbort(con->st);
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virStreamFree(con->st);
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con->st = NULL;
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}
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VIR_FREE(con->streamToTerminal.data);
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VIR_FREE(con->terminalToStream.data);
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if (con->stdinWatch != -1)
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virEventRemoveHandle(con->stdinWatch);
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if (con->stdoutWatch != -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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con->quit = true;
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virCondSignal(&con->cond);
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}
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static void
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virConsoleFree(virConsolePtr con)
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{
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if (!con)
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return;
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if (con->st)
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virStreamFree(con->st);
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virMutexDestroy(&con->lock);
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virCondDestroy(&con->cond);
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VIR_FREE(con);
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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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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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ignore_value(VIR_REALLOC_N(con->terminalToStream.data,
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con->terminalToStream.offset + 1024));
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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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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] == con->escapeChar) {
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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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ignore_value(VIR_REALLOC_N(con->streamToTerminal.data,
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con->streamToTerminal.offset + 1024));
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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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static char
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vshGetEscapeChar(const char *s)
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{
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if (*s == '^')
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return CONTROL(c_toupper(s[1]));
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return *s;
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}
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int
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vshRunConsole(vshControl *ctl,
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virDomainPtr dom,
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const char *dev_name,
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unsigned int flags)
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{
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virConsolePtr con = NULL;
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int ret = -1;
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struct sigaction old_sigquit;
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struct sigaction old_sigterm;
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struct sigaction old_sigint;
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struct sigaction old_sighup;
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struct sigaction old_sigpipe;
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struct sigaction sighandler = {.sa_handler = virConsoleHandleSignal,
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.sa_flags = SA_SIGINFO };
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sigemptyset(&sighandler.sa_mask);
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/* Put STDIN into raw mode so that stuff typed does not echo to the screen
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* (the TTY reads will result in it being echoed back already), and also
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* ensure Ctrl-C, etc is blocked, and misc other bits */
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if (vshTTYMakeRaw(ctl, true) < 0)
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goto resettty;
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/* Trap all common signals so that we can safely restore the original
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* terminal settings on STDIN before the process exits - people don't like
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* being left with a messed up terminal ! */
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got_signal = 0;
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sigaction(SIGQUIT, &sighandler, &old_sigquit);
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sigaction(SIGTERM, &sighandler, &old_sigterm);
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sigaction(SIGINT, &sighandler, &old_sigint);
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sigaction(SIGHUP, &sighandler, &old_sighup);
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sigaction(SIGPIPE, &sighandler, &old_sigpipe);
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if (VIR_ALLOC(con) < 0)
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goto cleanup;
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con->escapeChar = vshGetEscapeChar(ctl->escapeChar);
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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, dev_name, con->st, flags) < 0)
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goto cleanup;
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if (virCondInit(&con->cond) < 0 || virMutexInit(&con->lock) < 0)
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goto cleanup;
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virMutexLock(&con->lock);
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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 (virCondWait(&con->cond, &con->lock) < 0) {
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virMutexUnlock(&con->lock);
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VIR_ERROR(_("unable to wait on console condition"));
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goto cleanup;
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}
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}
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virMutexUnlock(&con->lock);
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ret = 0;
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cleanup:
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virConsoleFree(con);
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/* Restore original signal handlers */
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sigaction(SIGQUIT, &old_sigquit, NULL);
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sigaction(SIGTERM, &old_sigterm, NULL);
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sigaction(SIGINT, &old_sigint, NULL);
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sigaction(SIGHUP, &old_sighup, NULL);
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sigaction(SIGPIPE, &old_sigpipe, NULL);
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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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vshTTYRestore(ctl);
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return ret;
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}
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#endif /* !WIN32 */
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