OpenBSD command: lockspool-优快云博客

lockspool是一款用于邮件客户端锁定用户邮箱的实用程序。它通过获取用户名.lock文件来确保邮件操作的安全进行。若成功创建锁文件，则输出'1'；反之输出'0'并显示错误信息。对于超级用户，还可以指定其他用户的邮箱进行锁定。

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LOCKSPOOL(1)               OpenBSD Reference Manual               LOCKSPOOL(1)

NAME
     lockspool - lock user's system mailbox

SYNOPSIS
     lockspool [username]

DESCRIPTION
     lockspool is useful for a client mail program to attain proper locking.
     lockspool obtains a username.lock for the calling user and retains it un-
     til stdin is closed or a signal like SIGINT, SIGTERM, or SIGHUP is re-
     ceived. Additionally, the superuser may specify the name of a user in
     order to lock a different mailbox.

     If lockspool is able to create the lock file, ``1'' is written to stdout,
     otherwise ``0'' is written and an error message is written to stderr.
     lockspool will try up to 10 times to get the lock (sleeping for a short
     period in between tries).

     The lockspool utility exits 0 on success, and 1 if an error occurs.

FILES
     /var/mail/username.lock user's mail lock file

SEE ALSO
     mail(1), mail.local(8), sendmail(8)

HISTORY
     The lockspool program appeared in OpenBSD 2.4.