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-rw-r--r--usr.bin/pkill/pkill.18
1 files changed, 8 insertions, 0 deletions
diff --git a/usr.bin/pkill/pkill.1 b/usr.bin/pkill/pkill.1
index 143bbc4..badeb59 100644
--- a/usr.bin/pkill/pkill.1
+++ b/usr.bin/pkill/pkill.1
@@ -91,6 +91,12 @@ The following options are available:
Restrict matches to a process whose PID is stored in the
.Ar pidfile
file.
+The
+.Ar pidfile
+file must be locked with the
+.Xr flock 2
+syscall or created with
+.Xr pidfile 3 .
.It Fl G Ar gid
Restrict matches to processes with a real group ID in the comma-separated
list
@@ -233,8 +239,10 @@ An internal error occurred.
.Xr kill 1 ,
.Xr killall 1 ,
.Xr ps 1 ,
+.Xr flock 2 ,
.Xr kill 2 ,
.Xr sigaction 2 ,
+.Xr pidfile 3 ,
.Xr re_format 7
.\" Xr signal 7
.Sh HISTORY
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