Re: I need to watch a file descriptor while I don't know the corresponding file path

[Ujjwal Thaakar]

I propose we write one. Do you guys think I should do it?

On Sunday, April 21, 2013 7:25:05 PM UTC+5:30, Ujjwal Thaakar wrote:

Is there any provision like fs.Watch but for file descriptors?

[Matt]

If you're on Linux you can probably watch /proc/<pid>/fd/<fdno>

On Sun, Apr 21, 2013 at 9:55 AM, Ujjwal Thaakar <ujjwal...@gmail.com> wrote:

Is there any provision like fs.Watch but for file descriptors?

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[Nikhil Marathe]

Fds can refer to non files so there doesn't seem to be js level support. You'll want to use UV_poll_t https://github.com/search?q=uv_poll_t+repo%3AJoyent%2Fnode&ref=searchresults&type=Code

Nikhil

[Ujjwal Thaakar]

I'm really looking for a *nix level support

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Thanks
Ujjwal

[Ujjwal Thaakar]

When there is stat, there is fstat so I see it only reasonable that there should be a FWatch support at the js level and then Watch can be a special case of this. Watch does the same thing I guess at the backend using UV_poll_t so why not give direct support to watching fds. What do you think?

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Thanks
Ujjwal

[Nikhil Marathe]

File watchers use is specific routines at the back such as inotify, kqueue or fsevent. That said this is not the same as what UV_poll_t does. The former is for watching higher level changes to files, that is be notified when the file changes, the latter is for I/O readiness.

What is your use case for adding FD based fswatch?

Nikhil

[Ujjwal Thaakar]

I want to read the file descriptor returned by libpcap to know when I should read the live capture dump

[Ujjwal Thaakar]

This was possible previously with IOWatcher but what now?

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Thanks
Ujjwal

[Ben Noordhuis]

On Mon, Apr 22, 2013 at 6:15 PM, Ujjwal Thaakar <ujjwal...@gmail.com> wrote:
> This was possible previously with IOWatcher but what now?

new net.Socket({ fd: fd })