RE: [Webware-discuss] Re: init script bugs (AppServer autoreloads )

[Hancock, D. (DHANCOCK) <DHA...@ar...>]

I hope the following is helpful.  It's a function "daemon" that exists on
Linux (Redhat, at least, maybe other SysV init systems, too).  It's used to
make a backgrounded daemon out of a foreground process, and it looks like it
deals with getting the *right* PID.  Another possibility is to switch to
daemontools, which EXPECTS its managed processes to be foreground processes.

Caveat: I'm not using either of these techniques for handling WebKit
processes.

# A function to start a program.
daemon() {
        # Test syntax.
        local gotbase= force=
        local base= user= nice= bg= pid
        nicelevel=0
        while [ "$1" != "${1##[-+]}" ]; do
          case $1 in
            '')    echo $"$0: Usage: daemon [+/-nicelevel] {program}"
                   return 1;;
            --check)
                   base=$2
                   gotbase="yes"
                   shift 2
                   ;;
            --check=?*)
                   base=${1#--check=}
                   gotbase="yes"
                   shift
                   ;;
            --user)
                   user=$2
                   shift 2
                   ;;
            --user=?*)
                   user=${1#--user=}
                   shift
                   ;;
            --force)
                   force="force"
                   shift
                   ;;
            [-+][0-9]*)
                   nice="nice -n $1"
                   shift
                   ;;
            *)     echo $"$0: Usage: daemon [+/-nicelevel] {program}"
                   return 1;;
          esac
        done

        # Save basename.
        [ -z "$gotbase" ] && base=${1##*/}

        # See if it's already running. Look *only* at the pid file.
        pid=`pidfileofproc $base`

        [ -n "${pid:-}" -a -z "${force:-}" ] && return

        # make sure it doesn't core dump anywhere; while this could mask
        # problems with the daemon, it also closes some security problems
        ulimit -S -c 0 >/dev/null 2>&1

        # Echo daemon
        [ "${BOOTUP:-}" = "verbose" -a -z "$LSB" ] && echo -n " $base"

        # And start it up.
        if [ -z "$user" ]; then
           $nice initlog $INITLOG_ARGS -c "$*"
        else
           $nice initlog $INITLOG_ARGS -c "su -s /bin/bash - $user -c
\"$*\""
        fi
        [ "$?" -eq 0 ] && success $"$base startup" || failure $"$base
startup"
}


Cheers!
--
David Hancock | dha...@ar... | 410-266-4384


-----Original Message-----
From: Hollis Blanchard [mailto:ho...@pe...] 
Sent: Monday, December 15, 2003 12:47 AM
To: web...@li...
Subject: [Webware-discuss] Re: init script bugs (AppServer autoreloads)


On Sunday, Dec 14, 2003, at 23:18 US/Central, Hollis Blanchard wrote:
>
> +               su -s /bin/sh -c "$LAUNCH" $WEBKIT_USER >> $LOG 2>&1 &

Unfortunately the su causes $! to return a PID for the su process, 
which disappears instantly. So writing it to /var/run/webkit.pid later 
in the init script is worthless; what we really want is the PID of 
$LAUNCH. I guess the trailing & needs to be moved, but I can't figure 
it out right now. Anyone else?

Note that an su command was already present in the script, though 
commented out. I seem to recall that not working either when I tried it.

-Hollis



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