I have run into a problem after upgrading s system from 7.2 to 8.3 with a script that has worked correctly for about a decade. The script, written in perl, starts about 25 processes to gather information from a number of other systems. I create an array of filehandles, one per remote system and then open each with an ssh command: $pid = open $fh, "ssh -xa $_ <command> 2>& 1 |" I then set up a 30 second watchdog via sigalarm that will kill any process that has not completed and exited and do a wait for each process to complete with a waitpid. (The processes normally all complete in about 2 seconds.)
Each ssh command will return between about 14 and 32 KB of ASCII data, written line at a time with lines of no more than 80- characters.. On each run after the upgrade between 8 and 15 of the processes will hang and only a portion of the data will be available when I read the filehandle. Anyone have any idea what could have changed between FreeBSD 7.2 and 8.3? It looks like a bug or a new limitation on pipe operations. I don't know much about Perl internals, but I assume that no read is done on the pipe until I attempt to read the filehandle, so I believe it is some limit on writes to the pipe with no reads done. I have modified the script to write to files instead of a pipe and it is working again, but I would like to understand what broke my script. -- R. Kevin Oberman, Network Engineer E-mail: kob6...@gmail.com _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
