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From: Max Reitz <mreitz@redhat.com>
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Date: Sun, 11 Jun 2017 14:37:14 +0200
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Subject: [PATCH] qemu-nbd: Ignore SIGPIPE
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qemu proper has done so for 13 years
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(8a7ddc38a60648257dc0645ab4a05b33d6040063), qemu-img and qemu-io have
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done so for four years (526eda14a68d5b3596be715505289b541288ef2a).
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Ignoring this signal is especially important in qemu-nbd because
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otherwise a client can easily take down the qemu-nbd server by dropping
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the connection when the server wants to send something, for example:
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$ qemu-nbd -x foo -f raw -t null-co:// &
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[1] 12726
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$ qemu-io -c quit nbd://localhost/bar
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can't open device nbd://localhost/bar: No export with name 'bar' available
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[1] + 12726 broken pipe qemu-nbd -x foo -f raw -t null-co://
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In this case, the client sends an NBD_OPT_ABORT and closes the
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connection (because it is not required to wait for a reply), but the
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server replies with an NBD_REP_ACK (because it is required to reply).
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Message-Id: <20170611123714.31292-1-mreitz@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 041e32b8d9d076980b4e35317c0339e57ab888f1)
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---
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qemu-nbd.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/qemu-nbd.c b/qemu-nbd.c
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index 483dd77a77..5deb37e03e 100644
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--- a/qemu-nbd.c
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+++ b/qemu-nbd.c
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@@ -581,6 +581,10 @@ int main(int argc, char **argv)
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sa_sigterm.sa_handler = termsig_handler;
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sigaction(SIGTERM, &sa_sigterm, NULL);
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+#ifdef CONFIG_POSIX
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+ signal(SIGPIPE, SIG_IGN);
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+#endif
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+
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module_call_init(MODULE_INIT_TRACE);
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qcrypto_init(&error_fatal);
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