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qemu-nbd: Ignore SIGPIPE 

qemu proper has done so for 13 years
(8a7ddc38a6), qemu-img and qemu-io have
done so for four years (526eda14a6).
Ignoring this signal is especially important in qemu-nbd because
otherwise a client can easily take down the qemu-nbd server by dropping
the connection when the server wants to send something, for example:

$ qemu-nbd -x foo -f raw -t null-co:// &
[1] 12726
$ qemu-io -c quit nbd://localhost/bar
can't open device nbd://localhost/bar: No export with name 'bar' available
[1]  + 12726 broken pipe  qemu-nbd -x foo -f raw -t null-co://

In this case, the client sends an NBD_OPT_ABORT and closes the
connection (because it is not required to wait for a reply), but the
server replies with an NBD_REP_ACK (because it is required to reply).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20170611123714.31292-1-mreitz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Max Reitz 2017-06-11 14:37:14 +02:00 committed by Paolo Bonzini
parent 0c9390d978
commit 041e32b8d9
1 changed files with 4 additions and 0 deletions
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4
qemu-nbd.c
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@ -581,6 +581,10 @@ int main(int argc, char **argv)
sa_sigterm.sa_handler = termsig_handler;
sigaction(SIGTERM, &sa_sigterm, NULL);
#ifdef CONFIG_POSIX
signal(SIGPIPE, SIG_IGN);
#endif
module_call_init(MODULE_INIT_TRACE);
qcrypto_init(&error_fatal);