Date: Tue, 12 Mar 2019 23:52:35 +0200 (EET) From: Aki Tuomi <aki.tuomi@open-xchange.com> To: Alan Somers <asomers@freebsd.org>, Larry Rosenman <ler@lerctr.org> Cc: Freebsd current <freebsd-current@freebsd.org> Subject: Re: kqueue send over unix socket? Message-ID: <306073586.2112.1552427555424@appsuite-dev-gw2.open-xchange.com> In-Reply-To: <CAOtMX2g2043BCet5HWJRUFApMbUP4cUOWVnRb8m7n1Lf95tM8w@mail.gmail.com>
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Hi! I am trying exactly that. dtrace output gives following # dtrace -s sendmsg.d -p 61387 dtrace: script 'sendmsg.d' matched 30667 probes CPU ID FUNCTION:NAME 0 16637 uipc_send:return kernel`sosend_generic+0x556 kernel`kern_sendit+0x296 kernel`sendit+0x19e kernel`sys_sendmsg+0x61 kernel`amd64_syscall+0xa38 kernel`0xffffffff80f5891d 0 35794 sosend_generic:return kernel`kern_sendit+0x296 kernel`sendit+0x19e kernel`sys_sendmsg+0x61 kernel`amd64_syscall+0xa38 kernel`0xffffffff80f5891d 0 32432 kern_sendit:return kernel`sendit+0x19e kernel`sys_sendmsg+0x61 kernel`amd64_syscall+0xa38 kernel`0xffffffff80f5891d 0 55533 free:return kernel`sendit+0x1b0 kernel`sys_sendmsg+0x61 kernel`amd64_syscall+0xa38 kernel`0xffffffff80f5891d 0 16604 sendit:return kernel`sys_sendmsg+0x61 kernel`amd64_syscall+0xa38 kernel`0xffffffff80f5891d 0 30776 sys_sendmsg:return kernel`amd64_syscall+0xa38 kernel`0xffffffff80f5891d > On 12 March 2019 23:37 Alan Somers <asomers@freebsd.org> wrote: > > > Is he trying to send the kqueue file descriptor itself using sendmsg > with SCM_RIGHTS? It sounds like kqueues cannot be sent over unix > sockets; not every file type necessarily can. But if you want to know > the nitty-gritty details, just run this: > dtrace -i 'fbt:::return /arg1 == 45/ {stack();}' -c "my_program > my_options" and that will usually tell you the exact function that set > the error. > > If the output is too large, then you can filter it by writing a D > program like this: > > #sendmsg.d > fbt:kernel:sys_sendmsg:entry > { > this->trigger = 1; > } > fbt:::return > / this->trigger == 1 && arg1 == 45 / > { > stack(); > } > fbt:kernel:sys_sendmsg:return > { > this->trigger = 0; > } > > dtrace -s sendmsg.d -c "my_program my_options" > > Hope that helps. > -Alan > > On Tue, Mar 12, 2019 at 3:22 PM Larry Rosenman <ler@lerctr.org> wrote: > > > > I'm working with Aki Tuomi of Dovecot and he asks: > > > > I tried to ask if you could ask from some Kernel hacker why I cannot > > send kqueue() fd over unix socket, I get "Operation not supported". > > > > Can anyone help me? > > > > > > > > -- > > Larry Rosenman http://www.lerctr.org/~ler > > Phone: +1 214-642-9640 E-Mail: ler@lerctr.org > > US Mail: 5708 Sabbia Dr, Round Rock, TX 78665-2106 > > _______________________________________________ > > freebsd-current@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-current > > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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