监控文件锁，使用flock锁定

Question

我想获得一个持有共享锁的pid列表/tmp/file。这可以使用简单的命令行工具吗？

Answer 1

• 来自man lsof：

  FD 是文件的文件描述符编号或： FD 后跟以下字符之一，描述文件打开的模式：

            The mode character is followed by one of these lock characters, describing the type of lock applied to the file:
  
                 R for a read lock on the entire file;
                 W for a write lock on the entire file;
                 space if there is no lock.
  

因此，R在3uR平均读取/共享锁由发出613PID。

#lsof /tmp/file
COMMAND PID    USER   FD   TYPE DEVICE SIZE/OFF    NODE NAME
perl    613 turkish    3uR  REG    8,2        0 1306357 /tmp/file

• 直接从 读取/proc/locks比lsof，

  perl -F'[:\s]+' -wlanE'
    BEGIN { $inode = (stat(pop))[1]; @ARGV = "/proc/locks" }
    say "pid:$F[4] [$_]" if $F[7] == $inode
  ' /tmp/file