[Bug 224507] New port: devel/liblockfile standard lockfile library

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224507

            Bug ID: 224507
           Summary: New port: devel/liblockfile standard lockfile library
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: yasu at utahime.org

Created attachment 189015
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=189015&action=edit
patch file

This library implements a number of functions found in -lmail on SysV systems.
These functions are designed to lock the standard mailboxes in /var/mail (or
wherever the system puts them).

In additions, this library adds a number of functions to create, manage and
remove generic lockfiles.

The lockfiles are created by this library in an NFS-safe manner, that is by
using a tempfile and using link(2) to create the lockfile. It works around
several defects in NFS servers to make sure the lockfile is created atomically.

The locking strategy is compatible with other well-written NFS-safe programs
that create lockfiles - such as procmail, exim and mutt.

If you are trying to lock a mailbox in a directory writable for group mail, the
locking functions will call a helper application which runs setgid to do the
actual locking. The helper application "dotlockfile" can also be used directly,
for example for use in shellscripts.

This means a program such as a MUA doesn't need to be setgid mail anymore to be
able to lock the mailbox.

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