2017-04-12 23:12:04 +00:00
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# <a name="linuxRuntime" />Linux Runtime
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2017-02-01 00:45:59 +00:00
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2017-04-12 23:12:04 +00:00
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## <a name="runtimeLinuxFileDescriptors" />File descriptors
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2017-02-01 00:45:59 +00:00
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By default, only the `stdin`, `stdout` and `stderr` file descriptors are kept open for the application by the runtime.
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2017-04-12 23:12:04 +00:00
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The runtime MAY pass additional file descriptors to the application to support features such as [socket activation][socket-activated-containers].
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2017-02-01 00:45:59 +00:00
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Some of the file descriptors MAY be redirected to `/dev/null` even though they are open.
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2017-04-12 23:12:04 +00:00
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## <a name="runtimeLinuxDevSymbolicLinks" /> Dev symbolic links
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2017-02-01 00:45:59 +00:00
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2017-04-12 23:12:04 +00:00
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After the container has `/proc` mounted, the following standard symlinks MUST be setup within `/dev/` for the IO.
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2017-02-01 00:45:59 +00:00
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| Source | Destination |
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| --------------- | ----------- |
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| /proc/self/fd | /dev/fd |
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| /proc/self/fd/0 | /dev/stdin |
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| /proc/self/fd/1 | /dev/stdout |
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| /proc/self/fd/2 | /dev/stderr |
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2017-04-12 23:12:04 +00:00
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[socket-activated-containers]: http://0pointer.de/blog/projects/socket-activated-containers.html
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