Date: Sun, 14 May 2017 12:41:58 +0000 (UTC) From: Maxim Sobolev <sobomax@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r318268 - stable/11/sys/kern Message-ID: <201705141241.v4ECfwgE026105@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: sobomax Date: Sun May 14 12:41:58 2017 New Revision: 318268 URL: https://svnweb.freebsd.org/changeset/base/318268 Log: MFC r316874: restore ability to shutdown(2) datagram sockets. Modified: stable/11/sys/kern/uipc_socket.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/kern/uipc_socket.c ============================================================================== --- stable/11/sys/kern/uipc_socket.c Sun May 14 12:00:00 2017 (r318267) +++ stable/11/sys/kern/uipc_socket.c Sun May 14 12:41:58 2017 (r318268) @@ -2342,13 +2342,27 @@ int soshutdown(struct socket *so, int how) { struct protosw *pr = so->so_proto; - int error; + int error, soerror_enotconn; if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) return (EINVAL); + + soerror_enotconn = 0; if ((so->so_state & - (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING)) == 0) - return (ENOTCONN); + (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING)) == 0) { + /* + * POSIX mandates us to return ENOTCONN when shutdown(2) is + * invoked on a datagram sockets, however historically we would + * actually tear socket down. This is known to be leveraged by + * some applications to unblock process waiting in recvXXX(2) + * by other process that it shares that socket with. Try to meet + * both backward-compatibility and POSIX requirements by forcing + * ENOTCONN but still asking protocol to perform pru_shutdown(). + */ + if (so->so_type != SOCK_DGRAM) + return (ENOTCONN); + soerror_enotconn = 1; + } CURVNET_SET(so->so_vnet); if (pr->pr_usrreqs->pru_flush != NULL) @@ -2359,11 +2373,12 @@ soshutdown(struct socket *so, int how) error = (*pr->pr_usrreqs->pru_shutdown)(so); wakeup(&so->so_timeo); CURVNET_RESTORE(); - return (error); + return ((error == 0 && soerror_enotconn) ? ENOTCONN : error); } wakeup(&so->so_timeo); CURVNET_RESTORE(); - return (0); + + return (soerror_enotconn ? ENOTCONN : 0); } void
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201705141241.v4ECfwgE026105>