From 5eb07282aa143d610a79caa2551e115d026c11c3 Mon Sep 17 00:00:00 2001 From: root Date: Mon, 10 Jan 2011 13:53:49 +0000 Subject: *** empty log message *** --- ev_port.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/ev_port.c b/ev_port.c index 801de15..4aa0f4b 100644 --- a/ev_port.c +++ b/ev_port.c @@ -37,6 +37,17 @@ * either the BSD or the GPL. */ +/* useful reading: + * + * http://bugs.opensolaris.org/view_bug.do?bug_id=6268715 (random results) + * http://bugs.opensolaris.org/view_bug.do?bug_id=6455223 (just totally broken) + * http://bugs.opensolaris.org/view_bug.do?bug_id=6873782 (manpage ETIME) + * http://bugs.opensolaris.org/view_bug.do?bug_id=6874410 (implementation ETIME) + * http://www.mail-archive.com/networking-discuss@opensolaris.org/msg11898.html ETIME vs. nget + * http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/event_port.c (libc) + * http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/portfs/port.c#1325 (kernel) + */ + #include #include #include @@ -85,18 +96,20 @@ port_poll (EV_P_ ev_tstamp timeout) struct timespec ts; uint_t nget = 1; + /* we initialise this to something we will skip in the loop, as */ + /* port_getn can return with nget unchanged, but no indication */ + /* whether it was the original value or has been updated :/ */ + port_events [0].portev_source = 0; + EV_RELEASE_CB; EV_TS_SET (ts, timeout); res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); EV_ACQUIRE_CB; - if (res == -1) - { - if (errno != EINTR && errno != ETIME) - ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)"); - - return; - } + /* port_getn may or may not set nget on error */ + /* so we rely on port_events [0].portev_source not being updated */ + if (res == -1 && errno != ETIME && errno != EINTR) + ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)"); for (i = 0; i < nget; ++i) { @@ -130,6 +143,8 @@ port_init (EV_P_ int flags) if ((backend_fd = port_create ()) < 0) return 0; + assert (("libev: PORT_SOURCE_FD must not be zero"), PORT_SOURCE_FD); + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ -- cgit v1.2.3