The function of lock file named ".s.PGSQL.<port>.lock" on Linux?

When the psql server is started under Linux platform, in /tmp directory
there is a lock files named ".s.PGSQL..lock". So I want to know what
is the function of this lock file? And does the server work well without
this lock file?

Additionally, I know that the file ".s.PGSQL." is used as the unix
domain socket file. But the file ".s.PGSQL..lock" makes me still
pazzled. Could you explain that? Thanks.


Best wishes.





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