在Mac OS X中的强制性文件锁定 [英] Mandatory file locking in Mac OS X

问题描述

根据人页以下方法仅支持咨询锁：羊群，提供lockf 和的fcntl 。有什么办法来强制锁的某些文件由一个单一的过程中，例如用写锁定，这样其他进程将无法打开该文件的写权限？

According to a man pages the following approaches supports only advisory locking: flock, lockf and fcntl. Is there any way to mandatory lock a some file by a single process, for example with a write lock, so that other process will not able to open this file with the write permissions?

推荐答案

没有。在UNIX系列操作系统不支持一般强制性文件锁定 ¹ 。这包括的Linux，BSD和OS X。

No. Operating systems in the Unix family do not generally support mandatory file locking¹. This includes Linux, BSD, and OS X.

在一些Unix系统，你是无法打开文件，如果它们是可执行映像当前正在运行的写pvented $ P $; 的open（）将失败， ETXTBSY 。然而，你可以永远只是取消链接（删除）该文件并创建一个新的来代替，并没有将prevent这一点。

On some Unixes, you are prevented from opening files for writing if they are executable images that are currently running; open() will fail with ETXTBSY. However, you can always just unlink (delete) the file and create a new one instead, and nothing will prevent that.

¹ ：这是不完全正确的，但强制性文件锁需要一点的工作，强制锁是特定于平台的，和OS X对他们没有支持

¹: This is not entirely true, but mandatory file locks require a bit of work, mandatory locks are platform-specific, and OS X has no support for them.

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