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84 lines
1.6 KiB
Groff
84 lines
1.6 KiB
Groff
.Dd June 22, 2015
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.Dt ATRUN 8
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.Os
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.Sh NAME
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.Nm atrun
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.Nd run jobs queued for later execution
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.Sh SYNOPSIS
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.Nm atrun
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.Op Fl l Ar load_avg
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.Op Fl d
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.Sh DESCRIPTION
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.Nm Atrun
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runs jobs queued by
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.Xr at 1 .
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.Pp
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The system
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.Xr crontab 5
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file
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.Pa /etc/crontab
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must contain the line
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.Bd -literal
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*/5 * * * * root /usr/libexec/atrun
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.Ed
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.Pp
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so
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.Nm
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is invoked every five minutes.
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.Pp
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At every invocation,
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.Nm
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starts all the jobs in the lowercase queues whose start
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time has elapsed.
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In addition, if the load average over the last minute was less than
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the specified limit, then a maximum of one batch job (denoted by the
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uppercase queues) is started.
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.Pp
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Before starting a job,
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.Nm
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checks the status of its owner's account with
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.Xr pam 3
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and refuses to run the job if the account is unavailable,
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e.g., locked out or expired.
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.Sh OPTIONS
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.Bl -tag -width indent
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.It Fl l Ar load_avg
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Specify a limiting load factor, over which batch jobs should
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not be run, instead of the default of 1.5 * number of active CPUs.
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.It Fl d
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Debug; print error messages to standard error instead of using
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.Xr syslog 3 .
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.El
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.Sh WARNINGS
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For
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.Nm
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to work, a
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.Xr cron 8
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daemon must be running
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.Nm
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periodically.
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.Sh FILES
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.Bl -tag -width /etc/pam.d/atrun -compact
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.It Pa /etc/pam.d/atrun
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.Xr pam.conf 5
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configuration file for
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.Nm
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.It Pa /var/at/jobs
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Directory containing job files
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.It Pa /var/at/spool
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Directory containing output spool files
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.El
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.Sh SEE ALSO
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.Xr at 1 ,
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.Xr crontab 1 ,
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.Xr pam 3 ,
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.Xr syslog 3 ,
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.Xr crontab 5 ,
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.Xr pam.conf 5 ,
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.Xr cron 8
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.Sh BUGS
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The functionality of
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.Nm
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should be merged into
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.Xr cron 8 .
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