diff options
| author | Todd C. Miller <millert@cvs.openbsd.org> | 2020-04-16 17:51:57 +0000 |
|---|---|---|
| committer | Todd C. Miller <millert@cvs.openbsd.org> | 2020-04-16 17:51:57 +0000 |
| commit | 8423dd6ccd990d66462b98fb58fae83fb5c67554 (patch) | |
| tree | a33a9d33a7aca75a470a6e2b3e10266ba37c20c2 /usr.sbin/cron/crontab.5 | |
| parent | a6506a84d2f65c8f086e792b81d97943bc0644ae (diff) | |
Add a mechanism to prevent cron jobs from running concurrently.
This adds a new "-s" flag to the command field which indicates that
only a single instance of the job should run concurrenty.
OK beck@ job@ deraadt@
Diffstat (limited to 'usr.sbin/cron/crontab.5')
| -rw-r--r-- | usr.sbin/cron/crontab.5 | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/usr.sbin/cron/crontab.5 b/usr.sbin/cron/crontab.5 index ef9ac0a6672..756d0656872 100644 --- a/usr.sbin/cron/crontab.5 +++ b/usr.sbin/cron/crontab.5 @@ -17,9 +17,9 @@ .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT .\" OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" -.\" $OpenBSD: crontab.5,v 1.38 2020/04/15 01:59:34 millert Exp $ +.\" $OpenBSD: crontab.5,v 1.39 2020/04/16 17:51:56 millert Exp $ .\" -.Dd $Mdocdate: April 15 2020 $ +.Dd $Mdocdate: April 16 2020 $ .Dt CRONTAB 5 .Os .Sh NAME @@ -217,6 +217,13 @@ option is an attempt to cure potentially copious volumes of mail coming from .Xr cron 8 . .It Fl q Ar command Execution will not be logged. +.It Fl s Ar command +Only a single instance of +.Ar command +will be run concurrently. +Additional instances of +.Ar command +will not be scheduled until the earlier one completes. .El .Pp Commands are executed by |