File util-linux-flock-limitations.patch of Package util-linux.33154

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File util-linux-flock-limitations.patch of Package util-linux.33154

From f4d9018183ff9a6cd6a77bf33461b60570ec7622 Mon Sep 17 00:00:00 2001
From: Stanislav Brabec <sbrabec@suse.cz>
Date: Fri, 25 Mar 2022 09:26:48 +0100
Subject: flock: Decribe limitations of flock: deadlock, NFS, CIFS

The flock(1) does not refer to limitations of flock(2). Provide an
documentation entry point for solving of problems with flock on NFS
and CIFS and mention risk of deadlock.

Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>
Signed-off-by: Karel Zak <kzak@redhat.com>
---
 sys-utils/flock.1.adoc | 6 ++++++
 1 file changed, 6 insertions(+)

Index: util-linux-2.37.4/sys-utils/flock.1.adoc
===================================================================
--- util-linux-2.37.4.orig/sys-utils/flock.1.adoc
+++ util-linux-2.37.4/sys-utils/flock.1.adoc
@@ -95,6 +95,12 @@ The command uses <sysexits.h> exit statu
 
 When using the _command_ variant, and executing the child worked, then the exit status is that of the child command.
 
+== NOTES
+
+*flock* does not detect deadlock. See *flock*(2) for details.
+
+Some file systems (e. g. NFS and CIFS) have a limited implementation of *flock*(2) and flock may always fail. For details see *flock*(2), *nfs*(5) and *mount.cifs*(8). Depending on mount options, flock can always fail there.
+
 == EXAMPLES
 
 Note that "shell> " in examples is a command line prompt.
Index: util-linux-2.37.4/sys-utils/flock.1
===================================================================
--- util-linux-2.37.4.orig/sys-utils/flock.1
+++ util-linux-2.37.4/sys-utils/flock.1
@@ -109,6 +109,11 @@ Display help text and exit.
 The command uses <sysexits.h> exit status values for everything, except when using either of the options \fB\-n\fP or \fB\-w\fP which report a failure to acquire the lock with an exit status given by the \fB\-E\fP option, or 1 by default. The exit status given by \fB\-E\fP has to be in the range of 0 to 255.
 .sp
 When using the \fIcommand\fP variant, and executing the child worked, then the exit status is that of the child command.
+.SH "NOTES"
+.sp
+\fBflock\fP does not detect deadlock. See \fBflock\fP(2) for details.
+.sp
+Some file systems (e. g. NFS and CIFS) have a limited implementation of \fBflock\fP(2) and flock may always fail. For details see \fBflock\fP(2), \fBnfs\fP(5) and \fBmount.cifs\fP(8). Depending on mount options, flock can always fail there.
 .SH "EXAMPLES"
 .sp
 Note that "shell> " in examples is a command line prompt.

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