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Does sendmsg only work on AF_UNIX sockets?

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Does sendmsg only work on AF_UNIX sockets?

Subject: Does sendmsg only work on AF_UNIX sockets?
From: Dave Camp <email@hidden>
Date: Tue, 11 Nov 2008 12:22:20 -0800

My test code seems to bear this out, but I though I should ask anyway before giving up... if I want to send a file descriptor to another process via sendmsg(), will that only work over a unix domain socket, or is there some way to get that to work over a local AF_INET socket?

Or, is there some other way of getting a file descriptor from one process to another that I should be looking at (one that doesn't require write access to the file system)?

Thanks,
Dave

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