FCRON(8)

NAME
fcron - daemon to execute scheduled tasks

SYNOPSIS
fcron [ -c file ] [ -d ] [ -b ] [ -s time ] [ -m num ] [ -q num ] fcron [ -c file ] [ -d ] [ -f ] [ -o ] [ -y ] [ -p file ] [ -l time ] fcron [ -n dir ] fcron [ -h ] fcron [ -V ]

DESCRIPTION

Fcron should be started from /etc/rc or /etc/rc.local. Unless the -f (or --foreground) option is given, it will return immediately, so you don't need to start it with '&'.

Fcron loads users fcrontabs (see fcrontab(5)) files previously installed by fcrontab (see fcrontab(1)). Then, fcron calculates the time and date of each job's next execution, and determines how long it has to sleep, and sleeps for this amount of time. When it wakes up, it checks all jobs loaded and runs them if needed. When a job is executed, fcron forks, changes its user and group permissions to match those of the user the job is being done for, executes that job and mails the outputs to the user (this can be changed: see fcrontab(5)).

Informative message about what fcron is doing are sent to syslogd(8) under facility cron, priority notice. Warning and error messages are sent respectively at priority warning and error.

    Note: fcron sleeps at least 20 seconds after it has been started before executing a job to avoid to use too much resources during system boot.

OPTIONS

-f

--foreground
    Don't fork to the background. In this mode, fcron will output informational message to standard error as well as to syslogd.

-b

--background
    Force running in background, even if fcron has been compiled to run in foreground as default.

-s time

--savetime time
    Save fcrontabs on disk every time sec (default is 1800).

-m num

--maxserial num
    Run at most num serial jobs simultaneously. By default, this value is set to 1. See also: option serial in fcrontab(5).

-q num

--queuelen num
    Sets the sizes of the queues that are used to manage serial jobs and the lavg queue each to num. This means that (A) at most num serial jobs can be in the waiting state and (B) at most num jobs can wait until the system average load drops below a set value.

-c file

--configfile file
    Make fcron use config file file instead of default config file /etc/fcron.conf. To interact with that running fcron process, fcrontab must use the same config file (which is defined by fcrontab's option -c). That way, several fcron processes can run simultaneously on a single system (but each fcron process *must* have a different spool dir and pid file from the other processes).

-o

--once
    Execute all jobs that need to be run at the time fcron was started, wait for them, then return. Sets --sleeptime to 0. May be especially useful when used with options -y and -f in a script run, for instance, at dialup connection. See also: fcrontab's options volatile, stdout.

-y

--nosyslog
    Don't log to syslog at all. May be useful when running in foreground.

-p file

--logfilepath file
    If set, log to the file given as argument. fcron will log to both that file and syslog in parallel unless -y is also set.

-l time

--firstsleep time
    Sets the initial delay (in seconds) before any job is executed, default to 20 seconds.

-n dir

--newspooldir dir
    Create dir as a new spool directory for fcron. Set correctly its mode and owner. Then, exit.

-h

--help
    Display a brief description of the options.

-V

--version
    Display an informational message about fcron, including its version and the license under which it is distributed.

-d

--debug
    Run in debug mode (more details on stderr -- if option -f is set -- and in log file)

RETURN VALUES

Fcron returns 0 on normal exit, and 1 on error.

SIGNALS

SIGTERM
    Save configuration (time remaining until next execution, time and date of next execution, etc), wait for all running jobs and exit.

SIGUSR1
    Force fcron to reload its configuration.

SIGUSR2
    Make fcron print its current schedule on syslog. It also toggles on/off the printing on debug info on syslog.

SIGHUP
    Tell fcron to check if there is any configuration update (this signal is used by fcrontab(1))

SIGCONT
    Notify fcron that the system was just resumed from suspend (to memory or disk). This will trigger fcron to read the /var/run/fcron.suspend and update the task schedules accordingly. Note that fcron doesn't need this to detect suspend/resume on Linux.

CONFORMING TO

Should be POSIX compliant.

FILES

/etc/fcron.conf
    Configuration file for fcron, fcrontab and fcrondyn: contains paths (spool dir, pid file) and default programs to use (editor, shell, etc). See fcron.conf(5) for more details.

/etc/fcron.allow
    Users allowed to use fcrontab and fcrondyn (one name per line, special name "all" acts for everyone)

/etc/fcron.deny
    Users who are not allowed to use fcrontab and fcrondyn (same format as allow file)

/etc/pam.d/fcron (or /etc/pam.conf)
    PAM configuration file for fcron. Take a look at pam(8) for more details.

/var/run/fcron.suspend
    Location of fcron suspend file, for non-Linux systems. This should be used to let fcron know how long the system was suspended (to memory or disk), so as task schedules can be updated accordingly. The file must be owned by root:root, and not writable by others. When the system resumes, write the number of seconds (as a string) the system was suspended into this file, and then send a SIGCONT signal to make fcron process (and then delete) that file. This is not needed on Linux as fcron uses Linux-specific APIs to detect the resume and measure the suspend duration.

SEE ALSO
fcrontab(1), fcrondyn(1), fcrontab(5), fcron.conf(5), fcron(8). If you're learning how to use fcron from scratch, I suggest that you read the HTML version of the documentation (if your are not reading it right now! :) ): the content is the same, but it is easier to navigate thanks to the hyperlinks.

AUTHOR

Thibault Godouet <fcron@free.fr>