Messages in this thread Patch in this message | | | From | Rao Shoaib <> | Subject | [RFC net-next af_unix v1 1/1] net:af_unix: Allow unix sockets to raise SIGURG | Date | Tue, 18 May 2021 00:43:43 -0700 |
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From: Rao Shoaib <rao.shoaib@oracle.com>
TCP sockets allow SIGURG to be sent to the process holding the other end of the socket. Extend Unix sockets to have the same ability.
The API is the same in that the sender uses sendmsg() with MSG_OOB to raise SIGURG. Unix sockets behave in the same way as TCP sockets with SO_OOBINLINE set.
SIGURG is ignored by default, so applications which do not know about this feature will be unaffected. In addition to installing a SIGURG handler, the receiving application must call F_SETOWN or F_SETOWN_EX to indicate which process or thread should receive the signal.
Signed-off-by: Rao Shoaib <rao.shoaib@oracle.com> Signed-off-by: Matthew Wilcox <matthew.wilcox@oracle.com> --- net/unix/af_unix.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 5a31307ceb76..c8400c002882 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1838,8 +1838,6 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, return err; err = -EOPNOTSUPP; - if (msg->msg_flags&MSG_OOB) - goto out_err; if (msg->msg_namelen) { err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; @@ -1904,6 +1902,9 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, sent += size; } + if (msg->msg_flags & MSG_OOB) + sk_send_sigurg(other); + scm_destroy(&scm); return sent; -- 2.31.1
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