Editing POLLHUP polling
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'''This page is a work in progress''' | |||
Recently I've been trying to listen on multiple sockets at once for events like reading or writing. This has worked fine, but as I've tried to listen for a socket close event I've found the documentation poor and often contradictory. This page is my attempt to figure this topic out. | Recently I've been trying to listen on multiple sockets at once for events like reading or writing. This has worked fine, but as I've tried to listen for a socket close event I've found the documentation poor and often contradictory. This page is my attempt to figure this topic out. | ||
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* 1997: Linux 2.1.23pre1 added the poll system call, with no AF_UNIX socket support | * 1997: Linux 2.1.23pre1 added the poll system call, with no AF_UNIX socket support | ||
* 1998: Linux 2.1.106pre added AF_UNIX socket support | * 1998: Linux 2.1.106pre added AF_UNIX socket support | ||
* 2000: Linux 2.3.41pre2 returns POLLIN on empty socket close | * 2000: Linux 2.3.41pre2 returns POLLIN on empty socket close | ||
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The history of OpenBSD's behaviour is as follows: | The history of OpenBSD's behaviour is as follows: | ||
* 1996: | * 1996 may 18: poll() as a system call def0fdca14684753dfcf5932f90c11d82dd5c6da | ||
* 2013: | * 2013 oct 4: 1dd598610a0d79ae84da34f1e0d0f8bebdd38ecd | ||
* 2013 oct 6: 8e5efd0e12529b9c3820f5399c9da6a63281c34f | |||
* 2013 sep 28: 54beff47b69a9978611dfbe9f827c01d91357417 | |||
* 2015 may 10: b7b44fe5796e416f560eb15867dc757db11a47d6 POLLHUP? | |||
* 2020 jun 15: 2b88cdafd374c425bef518b6071e7ccde4677902 EVHUP | |||
* 2003 sep 23: 154dfaaa7e8e replace select backends | |||
* 2020 jun 15: 2b88cdafd374c425bef518b6071e7ccde4677902 match POLLHUP | |||
* 2022 feb 8: c5e59ae303d9 final switch to kqueue | |||
== NetBSD == | == NetBSD == | ||
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== Conclusions == | == Conclusions == | ||
poll can be used to check for socket closure alone on some systems, but it isn't portable. But it's a little more portable than kqueue and epoll? | |||