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lockf(1): Add EXAMPLES section

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* Add pretty small EXAMPLES section
 * While here, fix a warning in line 98 (new sentence in new line)

Approved by:	bcr@
Differential Revision:	https://reviews.freebsd.org/D25205
This commit is contained in:
fernape 2020-06-18 08:31:04 +00:00
parent ede6b26ba2
commit c05e9e0e3c
1 changed files with 22 additions and 2 deletions
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24
usr.bin/lockf/lockf.1
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd July 7, 1998
.Dd June 18, 2020
.Dt LOCKF 1
.Os
.Sh NAME
@ -95,7 +95,8 @@ Causes
.Nm
to fail if the specified lock
.Ar file
does not exist. If
does not exist.
If
.Fl n
is not specified,
.Nm
@ -160,6 +161,25 @@ The
did not exit normally,
but may have been signaled or stopped.
.El
.Sh EXAMPLES
The first job takes a lock and sleeps for 5 seconds in the background.
The second job tries to get the lock and timeouts after 1 second (PID numbers
will differ):
.Bd -literal -offset indent
$ lockf mylock sleep 5 & lockf -t 1 mylock echo "Success"
[1] 94410
lockf: mylock: already locked
.Ed
.Pp
The first job takes a lock and sleeps for 1 second in the background.
The second job waits up to 5 seconds to take the lock and echoes the message on
success (PID numbers will differ):
.Bd -literal -offset indent
$ lockf mylock sleep 1 & lockf -t 5 mylock echo "Success"
[1] 19995
Success
[1]+ Done lockf mylock sleep 1
.Ed
.Sh SEE ALSO
.Xr flock 2 ,
.Xr lockf 3 ,