AFAICT userspace calls shutdown(sock, how) with 'how' set to one of SHUT_RD (0),
SHUT_WR (1) or SHUT_RDWR(2).
The kernel code typically wants the bitmask of RCV_SHUTDOWN (1) | SEND_SHUTDOWN (2).
If you look at the af_unix.c unix_shutdown() there is a comment where it
add's one in order to do the conversion.
But I can't find the conversion before tcp_shutdown() or sctp_shutdown()
checks for 'how & SEND_SHUTDOWN'.
Which implies that shutdown(sock, SHUT_WR) doesn't work.
What have I missed?
Should I be passing 2 or 3 to a direct call to sock->ops->shutdown()?
(We currently pass 2 - which does outward disconnect anyway).
David
On Wed, 2014-02-26 at 15:18 +0000, David Laight wrote:
AFAICT userspace calls shutdown(sock, how) with 'how' set to one of SHUT_RD (0),
SHUT_WR (1) or SHUT_RDWR(2).
The kernel code typically wants the bitmask of RCV_SHUTDOWN (1) | SEND_SHUTDOWN (2).
If you look at the af_unix.c unix_shutdown() there is a comment where it
add's one in order to do the conversion.
But I can't find the conversion before tcp_shutdown() or sctp_shutdown()
checks for 'how & SEND_SHUTDOWN'.
Which implies that shutdown(sock, SHUT_WR) doesn't work.
What have I missed?
Should I be passing 2 or 3 to a direct call to sock->ops->shutdown()?
(We currently pass 2 - which does outward disconnect anyway).
Take a look at inet_shutdown()
From: Eric Dumazet
On Wed, 2014-02-26 at 15:18 +0000, David Laight wrote:
quoted
AFAICT userspace calls shutdown(sock, how) with 'how' set to one of SHUT_RD (0),
SHUT_WR (1) or SHUT_RDWR(2).
The kernel code typically wants the bitmask of RCV_SHUTDOWN (1) | SEND_SHUTDOWN (2).
If you look at the af_unix.c unix_shutdown() there is a comment where it
add's one in order to do the conversion.
But I can't find the conversion before tcp_shutdown() or sctp_shutdown()
checks for 'how & SEND_SHUTDOWN'.
Which implies that shutdown(sock, SHUT_WR) doesn't work.
What have I missed?
Should I be passing 2 or 3 to a direct call to sock->ops->shutdown()?
(We currently pass 2 - which does outward disconnect anyway).
Take a look at inet_shutdown()
Thanks - the lack of 'grep-friendly' structure member names makes
chasing through this code hard work.
David