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From:	"Pierre Bogossian" <bogossian AT mail DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Bad interaction between cygwin and ProcessBuilder when redirecting stdout
Date:	Thu, 18 Sep 2014 23:31:56 +0200
Sensitivity:	Normal
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Hi,
 
I'm trying to use ProcessBuilder to execute cygwin programs.
ProcessBuilder is a Java API to run command lines.
 
The problem I'm dealing with is that redirecting the stdout (or stderr) of a cygwin program to a file in append mode doesn't work.
The file is not written.
If I do the same with a normal windows program (not a cygwin one), it works. So it seems to be a cygwin related issue.
If I redirect the stdout of the cygwin program to a file in write mode (instead of append mode), it does work too.
 
Here's the groovy code I've used for testing:
 
/////////////////////
dir = "C:\\\\pbtest\\\\";
logFile = dir + "foo.txt";
 
ProcessBuilder pb = new ProcessBuilder()
        .command("sh", "writer.sh")
        .directory(new File(dir));
 
// redirect stdout to a file in write mode
//pb.redirectOutput(ProcessBuilder.Redirect.to(new File(logFile)));
 
// redirect stdout to a file in append mode
pb.redirectOutput(ProcessBuilder.Redirect.appendTo(new File(logFile)));
 
pb.start();
/////////////////////
 
Where the script writer.sh just echoes a line on stdout.
 
I've used "Process Monitor" to trace the accesses that are made to foo.txt both in the "append" and in the "write" cases.
I've attached the two trace files to this mail.
You'll notice that in the "append" case, sh doesn't even do the "WriteFile" call.
The other difference between the two traces is the option list java is passing to the "CreateFile" call:
 
In the "write" case:
    Desired Access: Generic Write, Read Attributes, Disposition: OverwriteIf

In the "append" case:
    Desired Access: Append Data/Add Subdirectory/Create Pipe Instance, Write EA, Read Attributes, Write Attributes, Read Control, Synchronize, Disposition: OpenIf

NB: I'm running cygwin 1.7.32 (32-bit) on Windows 7 (64-bit). The Java version is 1.7.0_40.
 
Regards,
 
Pierre

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Content-Disposition: attachment; filename=pb_append.txt

16:02:51,0072167	java.exe	5612	CreateFile	C:\pbtest\foo.txt	SUCCESS	Desired Access: Append Data/Add Subdirectory/Create Pipe Instance, Write EA, Read Attributes, Write Attributes, Read Control, Synchronize, Disposition: OpenIf, Options: Synchronous IO Non-Alert, Non-Directory File, Attributes: N, ShareMode: Read, Write, AllocationSize: 0, OpenResult: Opened
16:02:51,0952435	sh.exe	3192	DeviceIoControl	C:\pbtest\foo.txt	INVALID PARAMETER	Control: 0x1b0050 (Device:0x1b Function:20 Method: 0)
16:02:51,0952795	sh.exe	3192	QueryNameInformationFile	C:\pbtest\foo.txt	SUCCESS	Name: \pbtest\foo.txt
16:02:51,0969548	sh.exe	3192	CreateFile	C:\pbtest\foo.txt	SUCCESS	Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open For Backup, Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
16:02:51,0970670	sh.exe	3192	QueryInformationVolume	C:\pbtest\foo.txt	SUCCESS	VolumeCreationTime: 31/01/2013 21:13:11, VolumeSerialNumber: 5003-210E, SupportsObjects: True, VolumeLabel: CSC ESOE
16:02:51,0970883	sh.exe	3192	QueryAttributeInformationVolume	C:\pbtest\foo.txt	SUCCESS	FileSystemAttributes: Case Preserved, Case Sensitive, Unicode, ACLs, Compression, Named Streams, Object IDs, Reparse Points, Sparse Files, Quotas, Transactions, 0x3c00000, MaximumComponentNameLength: 255, FileSystemName: NTFS
16:02:51,0971132	sh.exe	3192	QueryNetworkOpenInformationFile	C:\pbtest\foo.txt	SUCCESS	CreationTime: 18/09/2014 13:38:07, LastAccessTime: 18/09/2014 15:43:47, LastWriteTime: 18/09/2014 16:02:25, ChangeTime: 18/09/2014 16:02:25, AllocationSize: 01/01/1601 02:00:00, EndOfFile: 01/01/1601 02:00:00, FileAttributes: A
16:02:51,0971351	sh.exe	3192	CloseFile	C:\pbtest\foo.txt	SUCCESS	
16:02:51,1362820	sh.exe	3192	CloseFile	C:\pbtest\foo.txt	SUCCESS	

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16:02:25,7924624	java.exe	5612	CreateFile	C:\pbtest\foo.txt	SUCCESS	Desired Access: Generic Write, Read Attributes, Disposition: OverwriteIf, Options: Synchronous IO Non-Alert, Non-Directory File, Attributes: N, ShareMode: Read, Write, AllocationSize: 0, OpenResult: Overwritten
16:02:25,9070108	sh.exe	6712	DeviceIoControl	C:\pbtest\foo.txt	INVALID PARAMETER	Control: 0x1b0050 (Device:0x1b Function:20 Method: 0)
16:02:25,9070460	sh.exe	6712	QueryNameInformationFile	C:\pbtest\foo.txt	SUCCESS	Name: \pbtest\foo.txt
16:02:25,9094194	sh.exe	6712	CreateFile	C:\pbtest\foo.txt	SUCCESS	Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open For Backup, Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
16:02:25,9095628	sh.exe	6712	QueryInformationVolume	C:\pbtest\foo.txt	SUCCESS	VolumeCreationTime: 31/01/2013 21:13:11, VolumeSerialNumber: 5003-210E, SupportsObjects: True, VolumeLabel: CSC ESOE
16:02:25,9095844	sh.exe	6712	QueryAttributeInformationVolume	C:\pbtest\foo.txt	SUCCESS	FileSystemAttributes: Case Preserved, Case Sensitive, Unicode, ACLs, Compression, Named Streams, Object IDs, Reparse Points, Sparse Files, Quotas, Transactions, 0x3c00000, MaximumComponentNameLength: 255, FileSystemName: NTFS
16:02:25,9096107	sh.exe	6712	QueryNetworkOpenInformationFile	C:\pbtest\foo.txt	SUCCESS	CreationTime: 18/09/2014 13:38:07, LastAccessTime: 18/09/2014 15:43:47, LastWriteTime: 18/09/2014 16:02:25, ChangeTime: 18/09/2014 16:02:25, AllocationSize: 01/01/1601 02:00:00, EndOfFile: 01/01/1601 02:00:00, FileAttributes: A
16:02:25,9096323	sh.exe	6712	CloseFile	C:\pbtest\foo.txt	SUCCESS	
16:02:25,9332531	sh.exe	6712	WriteFile	C:\pbtest\foo.txt	SUCCESS	Offset: 0, Length: 15, Priority: Normal
16:02:25,9335022	sh.exe	6712	CloseFile	C:\pbtest\foo.txt	SUCCESS	


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