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shared-conn
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Passing a net.Conn between processes.
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README.md
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shared-conn
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# Shared Conn > Passing a `net.Conn` between processes. ## Intro Toy program meant to address this [go forum issue](https://forum.golangbridge.org/t/bind-address-already-in-use-even-after-listener-closed/1510). This program creates a listener by binding to the supplied address, accesses the underlying FD, and passes it to a child process. The child process recreates the listener using the shared FD, then attempts to rebind the same address as the parent. It exposes two issues via command line flags. ## Setup ``` go get github.com/jdhenke/shared-conn ``` ## Usage ``` $ shared-conn -h Usage of shared-conn: -addr string address on which to listen (default ":1234") -ignoreFiles ignore closing FDs -triggerRace trigger race condition ``` ## Example Running with default settings *should* pass, although a race exists. ``` $ shared-conn parent | 17:36:02.190679 Using address=`:1234` parent | 17:36:02.193514 Closed listener. parent | 17:36:02.193528 Closed file. child | 17:36:02.196729 Using address=`:1234` child | 17:36:02.196920 Closed listener. child | 17:36:02.196929 Closed file. child | 17:36:02.196931 Rebinding... child | 17:36:02.196983 PASS parent | 17:36:02.197860 PASS ``` Running with trigger race *should* fail, although a race exists. ``` $ shared-conn -triggerRace parent | 17:36:08.220841 Using address=`:1234` child | 17:36:08.226717 Using address=`:1234` child | 17:36:08.226917 Closed listener. child | 17:36:08.226921 Closed file. child | 17:36:08.226922 Rebinding... child | 17:36:08.226972 Child could not recreate listener: listen tcp :1234: bind: address already in use parent | 17:36:10.226090 Closed listener. parent | 17:36:10.226135 Closed file. parent | 17:36:10.226188 Child process error: exit status 1 ``` Leaving the files open then attempting to rebind should always fail. ``` $ shared-conn -ignoreFiles parent | 17:36:14.632811 Using address=`:1234` parent | 17:36:14.635907 Closed listener. child | 17:36:14.638920 Using address=`:1234` child | 17:36:14.639092 Closed listener. child | 17:36:14.639095 Rebinding... child | 17:36:14.639142 Child could not recreate listener: listen tcp :1234: bind: address already in use parent | 17:36:14.639982 Child process error: exit status 1 ```
