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Message-ID: <1329902695.18384.101.camel@edumazet-laptop> Date: Wed, 22 Feb 2012 10:24:55 +0100 From: Eric Dumazet <eric.dumazet@...il.com> To: David Miller <davem@...emloft.net> Cc: piergiorgio.beruto@...il.com, netdev@...r.kernel.org, Michael Kerrisk <mtk.manpages@...il.com> Subject: [PATCH net-next] af_unix: MSG_TRUNC support for dgram sockets Piergiorgio Beruto expressed the need to fetch size of first datagram in queue for AF_UNIX sockets and suggested a patch against SIOCINQ ioctl. I suggested instead to implement MSG_TRUNC support as a recv() input flag, as already done for RAW, UDP & NETLINK sockets. len = recv(fd, &byte, 1, MSG_PEEK | MSG_TRUNC); MSG_TRUNC asks recv() to return the real length of the packet, even when is was longer than the passed buffer. There is risk that a userland application used MSG_TRUNC by accident (since it had no effect on af_unix sockets) and this might break after this patch. Signed-off-by: Eric Dumazet <eric.dumazet@...il.com> Tested-by: Piergiorgio Beruto <piergiorgio.beruto@...il.com> CC: Michael Kerrisk <mtk.manpages@...il.com> --- net/unix/af_unix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 0be4d24..8ee85aa 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1845,7 +1845,7 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, if (UNIXCB(skb).fp) siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); } - err = size; + err = (flags & MSG_TRUNC) ? skb->len - skip : size; scm_recv(sock, msg, siocb->scm, flags); -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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