[Bug 1194] l3fwd-cat: calling unsafe functions from signal handler

[Bug 1194] l3fwd-cat: calling unsafe functions from signal handler

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1194

            Bug ID: 1194
           Summary: l3fwd-cat: calling unsafe functions from signal
                    handler
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: examples
          Assignee: dev@dpdk.org
          Reporter: stephen@networkplumber.org
  Target Milestone: ---

The handling of SIGINT and SIGTERM in the l2fwd-cat example is unsafe and
non-portable.  The signal handler could be called by any thread at any time.

The current method (copy/paste from testpmd?) is to call cat_exit() in the
signal handler. This may race with other threads and cause problems.

The better solution is to set a flag in signal handler and then do the shutdown
aft er the main loop exits.

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