[Bug 194858] New: Utilize the kern.proc.cwd sysctl to obtain the current working directory of given process.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194858

            Bug ID: 194858
           Summary: Utilize the kern.proc.cwd sysctl to obtain the current
                    working directory of given process.
           Product: Ports Tree
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: btw at mail.ustc.edu.cn

Created attachment 149122
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149122&action=edit
patch for tmux

sysctl kern.proc.cwd has been added in r274167.

This patch utilizes the new sysctl to obtain the current working directory of
given process which could save a lot of overhead over kern.proc.filedesc if 
the given proc has a lot of open fds.

The patch is against tmux-1.9a [1].

This job is done as part of JuniorJobs [2].

[1] http://cznic.dl.sourceforge.net/project/tmux/tmux/tmux-1.9/tmux-1.9a.tar.gz
[2]
https://wiki.freebsd.org/JuniorJobs#sysctl_reporting_current_working_directory

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