site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Thread-index: AccTgPfzNlRD3n90EdunVQAX8i08Wg== Thread-topic: Kernel log: app uses send/recv on a pipe User-agent: Microsoft-Entourage/11.2.5.060620 Hi, I noticed the following kernel message in system log: Nov 28 20:10:42 TK-MB kernel[0]: CommandDroplet[1993] uses send/recv on a pipe CommandDroplet is the application that I develop as part of OnMyCommand which wraps Unix or AppleScript scripts with some GUI. I have been experimenting with it recently trying to make popen execution non-blocking. The problem is with pipe caching (you cannot work it around) which locks the reading and you get stuck in in fread (or fgets). I wanted to improve it but nothing seemed to work until I created a CFSocket on the file description from the stream. It works beautifully as a CFRunLoop source - providing a data in callback and not blocking. But the kernel message is a signal that there might be something wrong with it. See below for the code I used. When I #undef USE_CFSOCKET the kernel does not complain. I would really hate to go back to the previous synchronous/blocking code. Thanks, Tom http://www.abracode.com/free/cmworkshop/ bool POpenExecutor::Execute( const char *inCommand ) { if(inCommand == NULL) return true; FILE *fp = popen( inCommand, "r" ); if ( fp != NULL ) { #ifdef USE_CFSOCKET CFSocketContext context; context.version = 0; context.info = this; context.retain = NULL; context.release = NULL; context.copyDescription = NULL; int fileDesc = fileno(fp); mFileDescSocket = ::CFSocketCreateWithNative( kCFAllocatorDefault, fileDesc, kCFSocketDataCallBack, PopenCFSocketCallback, &context); if(mFileDescSocket != NULL) { mSource = ::CFSocketCreateRunLoopSource(kCFAllocatorDefault, mFileDescSocket, 0); if(mSource != NULL) ::CFRunLoopAddSource( ::CFRunLoopGetCurrent(), mSource, kCFRunLoopDefaultMode ); } return false; //not finished yet #else //USE_CFSOCKET static char oneLine[1024]; oneLine[0] = 0; do { fgets (oneLine, sizeof(oneLine), fp); } while( feof(fp) == 0 ); (void) pclose( fp ); return true; //finished #endif //USE_CFSOCKET } return true; //error condition. finished } _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com