On Thu, Sep 30, 2010 at 09:03:33AM +0200, Ed Schouten wrote: > Hi Jeremy, > > * Jeremy Chadwick <free...@jdc.parodius.com> wrote: > > 1) "mysqld_safe > /dev/null 2>&1 &" never released the tty > > 2) "nohup mysqld_safe > /dev/null 2>&1 &" did release the tty > > What happens if you run the following command? > > daemon -cf mysqld_safe
Let's try it and find out. This is all being done from pts/2. icarus# ps -auxwww -U mysql | grep mysqld_safe mysql 9997 0.0 0.0 8228 1592 1- I 11:38PM 0:00.01 /bin/sh /usr/local/bin/mysqld_safe --defaults-extra-file=/storage/mysql/my.cnf --user=mysql --datadir=/storage/mysql --pid-file=/storage/mysql/icarus.home.lan.pid --skip-innodb icarus# /usr/local/etc/rc.d/mysql-server stop Stopping mysql. Waiting for PIDS: 10078. icarus# daemon -c -f -u mysql /usr/local/bin/mysqld_safe --defaults-extra-file=/storage/mysql/my.cnf --user=mysql --datadir=/storage/mysql --pid-file=/storage/mysql/icarus.home.lan.pid --skip-innodb icarus# ps -auxwww -U mysql USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND mysql 11036 0.0 0.0 8228 1600 ?? Is 12:21AM 0:00.01 /bin/sh /usr/local/bin/mysqld_safe --defaults-extra-file=/storage/mysql/my.cnf --user=mysql --datadir=/storage/mysql --pid-file=/storage/mysql/icarus.home.lan.pid --skip-innodb mysql 11116 0.0 0.3 35100 11032 ?? I 12:21AM 0:00.02 [mysqld] icarus# exit $ exit [another window, different tty] icarus# pstat -t | grep pts/2 icarus# Summary: looks good to me. > The point is that FreeBSD's pts(4) driver only deallocates TTYs when > it's really sure nothing uses it anymore. Even if there is not a single > file descriptor referring to the slave device, it has to wait until > there exist no processes which have the TTY as its controlling TTY. Ah I see. Well that would explain the difference between Linux and FreeBSD then -- it sounds like Linux has a one-off with regards to fds that point to /dev/null. > The `pstat -t' command is quite useful to figure out whether there is > still a session associated with the TTY. > > See the following thread: > > http://lists.freebsd.org/pipermail/freebsd-ports/2010-July/062417.html Ahhh, two people pointing me to the same thread, sweet. :-) I wasn't subscribed to -ports back in July, else I'd almost certainly have said something then. It's exactly as you stated in that thread -- the tty is in "G" state (waiting to be freed/process to exist). Please note the below output was obtained *before* attempting the "daemon -cf" stuff you recommended. icarus# pstat -t | grep pts/1 pts/1 0 0 0 0 0 0 0 0 9372 0 G Until rc(8) can be updated to support daemon(8) natively, the ~76 ports which Do The Wrong Thing(tm) should get updated to do it this way. Ones like mysqlXX-server should be placed high on the priority list given their popularity/importance. -- | Jeremy Chadwick j...@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
