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Add fd section for linux container process#113

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Add fd section for linux container process #113

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6 changes: 6 additions & 0 deletions runtime-linux.md
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## File descriptors
By default, only the `stdin`, `stdout` and `stderr` file descriptors are kept open for the application by the runtime.

@wkingwkingAug 28, 2015

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stdin, stdout, and stderr only seem to be attached between the runtime and the application when process.terminal is false. When it's true, the applications standard streams are attached to a TTY. See (1).

@mrunalpmrunalpAug 28, 2015

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Yes, what those fds point to depends on the TTY setting, but the main point being that these are open for the application process.

@wkingwkingAug 29, 2015

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On Fri, Aug 28, 2015 at 08:21:14AM -0700, Mrunal Patel wrote:

Yes, what those fds point to depends on the TTY setting, but the
main point being that these are open for the application process.

Ah, good point.

the standard streams should maybe not be in backticks. Alternatively,
these existing occurrences should be in backticks [1,2] ;).


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).

Some of the file descriptors may be redirected to /dev/null even though they are open.

@wkingwkingAug 29, 2015

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/dev/null should probably be in backticks.