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Re: passfd on more platforms
From: |
Paolo Bonzini |
Subject: |
Re: passfd on more platforms |
Date: |
Mon, 14 Mar 2011 14:45:35 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.7 |
On 03/14/2011 02:36 PM, Bastien ROUCARIES wrote:
Or you could ask throught the socket, the process id of the receiving
process than send the handle.
Remember:
It is assumed that the two sides have coordinated and agreed to
transfer a file descriptor already, so that the sendfd is met with a
recvfd instead of an ordinary read.
No, you cannot unfortunately. Say that process 1 will do this:
send "getfd\n"
sendfd
then the following will work on Unix in process 2:
recv(socket, buf, 512) => return 6, buf = "getfd\n"
parse getfd
recvfd
If the recvfd info is sent on the normal channel (i.e. not out-of-band),
process 2 is going to fail like this:
recv(socket, buf, 512) => return 17, buf = "getfd\n0x12345678\0"
parse getfd
recvfd fails, or even worse it blocks (possibly forever)
even if recvfd doesn't block, parsing 0x12345678\0 fails
Paolo
- passfd on Solaris, (continued)
- passfd on Solaris, Bruno Haible, 2011/03/13
- passfd on more platforms, Bruno Haible, 2011/03/13
- Re: passfd on more platforms, Eric Blake, 2011/03/14
- Re: passfd on more platforms, Paolo Bonzini, 2011/03/14
- Re: passfd on more platforms, Bastien ROUCARIES, 2011/03/14
- Re: passfd on more platforms,
Paolo Bonzini <=
- Re: passfd on more platforms, Bastien ROUCARIES, 2011/03/14
- Re: passfd on more platforms, Paolo Bonzini, 2011/03/14
- Re: passfd on more platforms, Eric Blake, 2011/03/14
- Re: passfd on more platforms, Bastien ROUCARIES, 2011/03/14
- Re: passfd on more platforms, Paolo Bonzini, 2011/03/14
- Re: passfd on more platforms, Bastien ROUCARIES, 2011/03/14
- Re: passfd on more platforms, Paolo Bonzini, 2011/03/14
- Re: passfd on more platforms, Bastien ROUCARIES, 2011/03/14
- Re: passfd on more platforms, Paolo Bonzini, 2011/03/14
- Re: passfd on more platforms, Bastien ROUCARIES, 2011/03/14