18 lines
773 B
Markdown
18 lines
773 B
Markdown
# Linux Runtime
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## File descriptors
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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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The runtime MAY pass additional file descriptors to the application to support features such as [socket activation](http://0pointer.de/blog/projects/socket-activated-containers.html).
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Some of the file descriptors MAY be redirected to `/dev/null` even though they are open.
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## Dev symbolic links
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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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| 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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