Am Montag, den 02.10.2006, 17:51 +0200 schrieb Ales Katona:
> FreeBSD might or might not have /proc mounted. Default is no however, so
> you can't be sure.
>
> However you can still save the pid # of the process in some file, then
> when starting a new one, read this number, check output of ps (or use
> syscalls if applicable) for given number and if "pos" finds the name of
> your app then it's running. Otherwise start and override the file.
>
> This way even if you crash and then another process takes your old pid
> you still can see if it's your app or not.
At least FreeBSD 4 has a pid-file in /var/run:
$ ls /var/run/
cron.pid emacs ld.so.hints ppp sshd.pid
dev.db inetd.pid log printer syslog.pid
dhcpd isdnd.pid mountd.pid run utmp
dmesg.boot ld-elf.so.hints moused.pid sendmail.pid
$ cat /var/run/cron.pid
122
$ ps aux|grep cron
root 122 0,0 0,1 1056 768 ?? Ss 12:14am 0:00,00 /usr/sbin/cron
Don't know about os version 5 or 6 or 7 though ...
HTH,
Marc
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