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SIGLOST in recvfrom()

From: Pino Toscano
Subject: SIGLOST in recvfrom()
Date: Wed, 23 Nov 2011 16:42:41 +0100
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with the attached test source, I get SIGLOST in recvfrom().
Basically what happens in recvfrom() is the following:
- the __socket_recv() RPC returns a MACH_PORT_NULL 'addrport'
- execution goes inside the "if (addr != NULL)"
- the __socket_whatis_address() RPC fails because of the null port (I
  presume), so err is MACH_SEND_INVALID_DEST
- the generic "if (err)" is followed, and then __hurd_sockfail() raises

The question is: is __socket_recv() supposed to actually return an 
addrport in this case, or should recvfrom() just being able to 
gracefully cope with this situation?
On Linux the address length is set to 0 by recvfrom(), so I guess that 
this kind of sockets have no address?

Pino Toscano

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