diff options
| author | Max Reitz <mreitz@redhat.com> | 2017-06-11 14:37:14 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-06-15 11:04:05 +0200 |
| commit | 041e32b8d9d076980b4e35317c0339e57ab888f1 (patch) | |
| tree | a75e5f82c44a4c87d9294c85af14954b3939a918 /qemu-nbd.c | |
| parent | 0c9390d978cbf61e8f16c9f580fa96b305c43568 (diff) | |
qemu-nbd: Ignore SIGPIPE
qemu proper has done so for 13 years
(8a7ddc38a60648257dc0645ab4a05b33d6040063), qemu-img and qemu-io have
done so for four years (526eda14a68d5b3596be715505289b541288ef2a).
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>
Diffstat (limited to 'qemu-nbd.c')
| -rw-r--r-- | qemu-nbd.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/qemu-nbd.c b/qemu-nbd.c index 9464a0461c..4dd3fd4732 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -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); |