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Code Issues Wiki Activity

Bug 424996 - Improved error reporting when determining GDB version

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Change-Id: I8aca4b262e6545a9196ccb63dd180eb635eb9181
Signed-off-by: Marc Khouzam <marc.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/20326
Tested-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
IP-Clean: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
This commit is contained in:
Marc Khouzam 2014-01-06 14:54:34 -05:00
parent 1de1915f89
commit a2e42758f2
1 changed files with 71 additions and 42 deletions
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85
dsf-gdb/org.eclipse.cdt.dsf.gdb/src/org/eclipse/cdt/dsf/gdb/launching/LaunchUtils.java
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@ -1,5 +1,5 @@
/*******************************************************************************
* Copyright (c) 2010, 2013 Ericsson and others.
* Copyright (c) 2010, 2014 Ericsson and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
@ -10,6 +10,7 @@
* Ericsson - Added support for Mac OS
* Sergey Prigogin (Google)
* Marc Khouzam (Ericsson) - Add timer when fetching GDB version (Bug 376203)
* Marc Khouzam (Ericsson) - Better error reporting when obtaining GDB version (Bug 424996)
*******************************************************************************/
package org.eclipse.cdt.dsf.gdb.launching;
@ -289,39 +290,82 @@ public class LaunchUtils {
}
/**
* This method actually launches 'gdb --vesion' to determine the version
* This method actually launches 'gdb --version' to determine the version
* of the GDB that is being used. This method should ideally be called
* only once and the resulting version string stored for future uses.
* only once per session and the resulting version string stored for future uses.
*
* A timeout is scheduled which will kill the process if it takes too long.
*/
public static String getGDBVersion(final ILaunchConfiguration configuration) throws CoreException {
final Process process;
String cmd = getGDBPath(configuration).toOSString() + " --version"; //$NON-NLS-1$
Process process = null;
Job timeoutJob = null;
try {
process = ProcessFactory.getFactory().exec(cmd, getLaunchEnvironment(configuration));
} catch(IOException e) {
throw new DebugException(new Status(IStatus.ERROR, GdbPlugin.PLUGIN_ID, DebugException.REQUEST_FAILED,
"Error while launching command: " + cmd, e.getCause()));//$NON-NLS-1$
}
// Start a timeout job to make sure we don't get stuck waiting for
// an answer from a gdb that is hanging
// Bug 376203
Job timeoutJob = new Job("GDB version timeout job") { //$NON-NLS-1$
final Process finalProc = process;
timeoutJob = new Job("GDB version timeout job") { //$NON-NLS-1$
{ setSystem(true); }
@Override
protected IStatus run(IProgressMonitor arg) {
// Took too long. Kill the gdb process and
// let things clean up.
process.destroy();
finalProc.destroy();
return Status.OK_STATUS;
}
};
timeoutJob.schedule(10000);
InputStream stream = null;
String streamOutput = readStream(process.getInputStream());
String gdbVersion = getGDBVersionFromText(streamOutput);
if (gdbVersion == null || gdbVersion.isEmpty()) {
Exception detailedException = null;
if (!streamOutput.isEmpty()) {
// We got some output but couldn't parse it. Make that output visible to the user in the error dialog.
detailedException = new Exception("Unexpected output format: \n\n" + streamOutput); //$NON-NLS-1$
} else {
// We got no output. Check if we got something on the error stream.
streamOutput = readStream(process.getErrorStream());
if (!streamOutput.isEmpty()) {
detailedException = new Exception(streamOutput);
}
}
throw new DebugException(new Status(IStatus.ERROR, GdbPlugin.PLUGIN_ID, DebugException.REQUEST_FAILED,
"Could not determine GDB version using command: " + cmd, //$NON-NLS-1$
detailedException));
}
return gdbVersion;
} catch (IOException e) {
throw new DebugException(new Status(IStatus.ERROR, GdbPlugin.PLUGIN_ID, DebugException.REQUEST_FAILED,
"Error with command: " + cmd, e));//$NON-NLS-1$
} finally {
// If we get here we are obviously not stuck reading the stream so we can cancel the timeout job.
// Note that it may already have executed, but that is not a problem.
if (timeoutJob != null) {
timeoutJob.cancel();
}
if (process != null) {
process.destroy();
}
}
}
/**
* Read from the specified stream and return what was read.
*
* @param stream The input stream to be used to read the data. This method will close the stream.
* @return The data read from the stream
* @throws IOException If an IOException happens when reading the stream
*/
private static String readStream(InputStream stream) throws IOException {
StringBuilder cmdOutput = new StringBuilder(200);
try {
stream = process.getInputStream();
Reader r = new InputStreamReader(stream);
BufferedReader reader = new BufferedReader(r);
@ -330,31 +374,16 @@ public class LaunchUtils {
cmdOutput.append(line);
cmdOutput.append('\n');
}
} catch (IOException e) {
throw new DebugException(new Status(IStatus.ERROR, GdbPlugin.PLUGIN_ID, DebugException.REQUEST_FAILED,
"Error reading GDB STDOUT after sending: " + cmd, e.getCause()));//$NON-NLS-1$
return cmdOutput.toString();
} finally {
// If we get here we are obviously not stuck so we can cancel the timeout job.
// Note that it may already have executed, but that is not a problem.
timeoutJob.cancel();
// Cleanup to avoid leaking pipes
// Close the stream we used, and then destroy the process
// Bug 345164
if (stream != null) {
try {
stream.close();
} catch (IOException e) {}
}
process.destroy();
}
String gdbVersion = getGDBVersionFromText(cmdOutput.toString());
if (gdbVersion == null || gdbVersion.isEmpty()) {
throw new DebugException(new Status(IStatus.ERROR, GdbPlugin.PLUGIN_ID, DebugException.REQUEST_FAILED,
"Could not determine GDB version after sending: " + cmd, null));//$NON-NLS-1$
}
return gdbVersion;
}
public static boolean getIsAttach(ILaunchConfiguration config) {