From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
To: Helmut Eller <eller.helmut@gmail.com>
Cc: 5723@debbugs.gnu.org
Subject: bug#5723: 23.1.94; make-network-process and emacs hangs
Date: Fri, 19 Mar 2010 10:47:05 +0900 [thread overview]
Message-ID: <wlvdct5bhi.wl%mituharu@math.s.chiba-u.ac.jp> (raw)
In-Reply-To: <wlvdcu6ltf.wl%mituharu@math.s.chiba-u.ac.jp>
>>>>> On Thu, 18 Mar 2010 18:06:20 +0900, YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> said:
>>> If your case blocks at `connect', then it can't be quit with C-g
>>> regardless of SYNC_INPUT on those ports/systems, because atimer is
>>> turned off during the `connect' call.
>> Why is the timer turned off around connect? Handling SIGALARM
>> during connect doesn't seem much different from handling SIGIO.
> I think your argument makes sense.
The current code closes the socket and call `connect' again if
(blocking) `connect' is interrupted by a signal.
2004-11-09 Kim F. Storm <storm@cua.dk>
* process.c (Fmake_network_process): Remove kludge for interrupted
connects on BSD. If connect is interrupted, just close socket and
start over rather than sleeping and retry with same socket.
(http://cvs.savannah.gnu.org/viewvc/emacs/src/process.c?root=emacs&r1=1.443&r2=1.444)
UNIX Network Programming (Richard Stevens et al.) says "What we must
do in this scenario is call /select/" (Section 16,5, Volume 1 third
edition).
Also, POSIX says:
If connect() is interrupted by a signal that is caught while blocked
waiting to establish a connection, connect() shall fail and set
errno to [EINTR], but the connection request shall not be aborted,
and the connection shall be established asynchronously.
...
When the connection has been established asynchronously, select()
and poll() shall indicate that the file descriptor for the socket is
ready for writing.
(http://www.opengroup.org/onlinepubs/000095399/functions/connect.html)
Perhaps we should try this, not just removing `turn_on_atimers' calls.
YAMAMOTO Mitsuharu
mituharu@math.s.chiba-u.ac.jp
next prev parent reply other threads:[~2010-03-19 1:47 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-15 16:01 bug#5723: 23.1.94; make-network-process and emacs hangs Leo
2010-03-15 18:24 ` Dan Nicolaescu
2010-03-15 19:22 ` Stefan Monnier
2010-03-15 22:49 ` Helmut Eller
2010-03-16 0:45 ` YAMAMOTO Mitsuharu
2010-03-17 12:01 ` Leo
2010-03-18 1:57 ` YAMAMOTO Mitsuharu
2010-03-18 7:43 ` Helmut Eller
2010-03-18 9:06 ` YAMAMOTO Mitsuharu
2010-03-19 1:47 ` YAMAMOTO Mitsuharu [this message]
2010-03-19 6:41 ` Helmut Eller
2010-03-19 10:21 ` YAMAMOTO Mitsuharu
2010-03-19 13:29 ` Stefan Monnier
2010-03-20 0:30 ` YAMAMOTO Mitsuharu
2010-03-20 12:34 ` Leo
2010-03-24 22:00 ` Chong Yidong
2010-03-24 23:31 ` YAMAMOTO Mitsuharu
2010-03-25 1:25 ` Chong Yidong
2010-03-18 9:58 ` Leo
2010-03-18 2:20 ` YAMAMOTO Mitsuharu
2010-03-18 10:00 ` Leo
2010-03-18 10:37 ` YAMAMOTO Mitsuharu
2010-03-18 10:47 ` Leo
2010-03-18 11:01 ` YAMAMOTO Mitsuharu
2010-03-17 11:53 ` Leo
2010-03-25 9:00 ` bug#5723: (no subject) YAMAMOTO Mitsuharu
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