* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <5x1yfva7m8.fsf@kfs2.cua.dk> @ 2002-02-10 18:39 ` Pavel Janík 2002-02-10 19:57 ` Kim F. Storm [not found] ` <5xn0yhrtye.fsf@kfs2.cua.dk> 0 siblings, 2 replies; 13+ messages in thread From: Pavel Janík @ 2002-02-10 18:39 UTC (permalink / raw) Cc: emacs-devel From: storm@cua.dk (Kim F. Storm) Date: 09 Feb 2002 00:14:55 +0100 > I think it should at least be able to use the existing gnus and/or > rmail settings (they cannot be that hard to use). > You can then add extra mailboxes to check specifically. > > What about these options: > - display-time-pop3-check-rmail (nil/t, default t) > - display-time-pop3-check-gnus (nil/t, default t) > - display-time-pop3-mail-boxes (alist (server.passwd), default ()) Hmm, when I think about it - it would be better if those mail programs like RMAIL and Gnus could tells us alone if there is any new mail. Syntax of Gnus' mail-sources variable is pretty easy, but Gnus also support IMAP etc. and we should not duplicate code in display-time. What do you think? > With the pop3 sample code I posted some time ago, there is one serious > problem: If emacs cannot connect to the pop3 server, it may hang (no > user interaction) until the connect times out. That is not > satisfactory! > > I don't know if this is relevant for your code (sorry, but I haven't > had time to look at the code you sent me). The same applies to pop3.el from Gnus. -- Pavel Janík panic("sun_82072_fd_inb: How did I get here?"); -- 2.2.16 include/asm-sparc/floppy.h ^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: display-time, mail-icon and POP3 mailboxes 2002-02-10 18:39 ` display-time, mail-icon and POP3 mailboxes Pavel Janík @ 2002-02-10 19:57 ` Kim F. Storm [not found] ` <5xn0yhrtye.fsf@kfs2.cua.dk> 1 sibling, 0 replies; 13+ messages in thread From: Kim F. Storm @ 2002-02-10 19:57 UTC (permalink / raw) Cc: GNUS mailing list Pavel@Janik.cz (Pavel Janík) writes: > From: storm@cua.dk (Kim F. Storm) > Date: 09 Feb 2002 00:14:55 +0100 > > > I think it should at least be able to use the existing gnus and/or > > rmail settings (they cannot be that hard to use). > > You can then add extra mailboxes to check specifically. > > > > What about these options: > > - display-time-pop3-check-rmail (nil/t, default t) > > - display-time-pop3-check-gnus (nil/t, default t) > > - display-time-pop3-mail-boxes (alist (server.passwd), default ()) > > Hmm, when I think about it - it would be better if those mail programs like > RMAIL and Gnus could tells us alone if there is any new mail. Syntax of > Gnus' mail-sources variable is pretty easy, but Gnus also support IMAP > etc. and we should not duplicate code in display-time. What do you think? I agree. It seems to be the right approach for such packages to have a hook function for display-time to check for unread mail (using whatever method those packages support for retrieving mail). > > > With the pop3 sample code I posted some time ago, there is one serious > > problem: If emacs cannot connect to the pop3 server, it may hang (no > > user interaction) until the connect times out. That is not > > satisfactory! > > > > I don't know if this is relevant for your code (sorry, but I haven't > > had time to look at the code you sent me). > > The same applies to pop3.el from Gnus. In my experience [based on my own pop3 hacks], this is really, really annoying (since the poll runs through a timer)!!! If we want to support this in general, we must implement an async version of open-network-stream (or add an optional arg to it to make it async - that arg could be a function which is called when the connection has been opened. -- Kim F. Storm <storm@cua.dk> http://www.cua.dk ^ permalink raw reply [flat|nested] 13+ messages in thread
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* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <5xn0yhrtye.fsf@kfs2.cua.dk> @ 2002-02-11 18:48 ` Richard Stallman 2002-02-11 23:31 ` Kim F. Storm ` (2 more replies) 0 siblings, 3 replies; 13+ messages in thread From: Richard Stallman @ 2002-02-11 18:48 UTC (permalink / raw) Cc: emacs-devel, ding > > With the pop3 sample code I posted some time ago, there is one serious > > problem: If emacs cannot connect to the pop3 server, it may hang (no > > user interaction) until the connect times out. That is not > > satisfactory! > > The same applies to pop3.el from Gnus. If we want to support this in general, we must implement an async version of open-network-stream (or add an optional arg to it to make it async - that arg could be a function which is called when the connection has been opened. Is it hanging in open-network-stream? If so, precisely where in open-network-stream is it waiting? It may be a straightforward matter to implement quitting from a few places where the waiting typically happens. That would fix this problem. ^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: display-time, mail-icon and POP3 mailboxes 2002-02-11 18:48 ` Richard Stallman @ 2002-02-11 23:31 ` Kim F. Storm [not found] ` <a49p7s$657$1@quimby2.netfonds.no> [not found] ` <5x3d07iojn.fsf@kfs2.cua.dk> 2 siblings, 0 replies; 13+ messages in thread From: Kim F. Storm @ 2002-02-11 23:31 UTC (permalink / raw) Richard Stallman <rms@gnu.org> writes: > > > With the pop3 sample code I posted some time ago, there is one serious > > > problem: If emacs cannot connect to the pop3 server, it may hang (no > > > user interaction) until the connect times out. That is not > > > satisfactory! > > > > The same applies to pop3.el from Gnus. > > If we want to support this in general, we must implement an async > version of open-network-stream (or add an optional arg to it to make > it async - that arg could be a function which is called when the > connection has been opened. > > Is it hanging in open-network-stream? If so, > precisely where in open-network-stream is it waiting? > It may be a straightforward matter to implement quitting from > a few places where the waiting typically happens. > That would fix this problem. I haven't debugged this specifically with emacs, but in other programs, it has been necessary to make connect non-blocking with fcntl(s,F_SETFL,O_NONBLOCK) and then use the writefds of select to know when the connect has completed (at least on GNU/Linux). -- Kim F. Storm <storm@cua.dk> http://www.cua.dk ^ permalink raw reply [flat|nested] 13+ messages in thread
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* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <a49p7s$657$1@quimby2.netfonds.no> @ 2002-02-12 16:25 ` Jan Vroonhof 0 siblings, 0 replies; 13+ messages in thread From: Jan Vroonhof @ 2002-02-12 16:25 UTC (permalink / raw) storm@cua.dk (Kim F. Storm) writes: > I haven't debugged this specifically with emacs, but in other > programs, it has been necessary to make connect non-blocking with > fcntl(s,F_SETFL,O_NONBLOCK) and then use the writefds of select to > know when the connect has completed (at least on GNU/Linux). Does anybody know whether Linux generates SIGIO when the socket is ready in this case, or do you absolutely need to poll using select()? I also recall somebody stating recently that this behavior isn't really portable? Can somebody confirm in the positive and/or negative. Jan ^ permalink raw reply [flat|nested] 13+ messages in thread
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* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <5x3d07iojn.fsf@kfs2.cua.dk> @ 2002-02-12 16:32 ` Paul Jarc [not found] ` <m3u1sm4q4f.fsf@multivac.cwru.edu> 2002-02-13 15:38 ` Richard Stallman 2 siblings, 0 replies; 13+ messages in thread From: Paul Jarc @ 2002-02-12 16:32 UTC (permalink / raw) storm@cua.dk (Kim F. Storm) wrote: > I haven't debugged this specifically with emacs, but in other > programs, it has been necessary to make connect non-blocking with > fcntl(s,F_SETFL,O_NONBLOCK) and then use the writefds of select to > know when the connect has completed (at least on GNU/Linux). See also <URL:http://cr.yp.to/docs/connect.html>. paul ^ permalink raw reply [flat|nested] 13+ messages in thread
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* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <m3u1sm4q4f.fsf@multivac.cwru.edu> @ 2002-02-13 0:27 ` Kim F. Storm [not found] ` <5x4rkmfcp8.fsf@kfs2.cua.dk> 1 sibling, 0 replies; 13+ messages in thread From: Kim F. Storm @ 2002-02-13 0:27 UTC (permalink / raw) Cc: ding prj@po.cwru.edu (Paul Jarc) writes: > storm@cua.dk (Kim F. Storm) wrote: > > I haven't debugged this specifically with emacs, but in other > > programs, it has been necessary to make connect non-blocking with > > fcntl(s,F_SETFL,O_NONBLOCK) and then use the writefds of select to > > know when the connect has completed (at least on GNU/Linux). > > See also <URL:http://cr.yp.to/docs/connect.html>. Nice summary, thanks! In any case, I think it would make sense for open-network-stream to have an optional 5th argument which serves two purposes: If it is omitted or nil, the current blocking connect is used. If it is non-nil, a non-blocking connect is attempted - if supported by the o/s (and the emacs code) - and when the connection is established, the argument (which must be a function) is called to initiate using the connection. The arguments to that function will probably be the process and buffer (this is still TBD). If the o/s (or emacs) does not support non-blocking connect, a blocking connect will be performed - and the supplied function will simply be called before open-network-stream returns (it may need an arg indicating whether a blocking or non-blocking connect was made to arrange for different things to happen when open-network-stream returns). -- Kim F. Storm <storm@cua.dk> http://www.cua.dk ^ permalink raw reply [flat|nested] 13+ messages in thread
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* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <5x4rkmfcp8.fsf@kfs2.cua.dk> @ 2002-02-14 3:12 ` Richard Stallman 2002-02-14 9:41 ` Kim F. Storm [not found] ` <5xlmdwe6ym.fsf@kfs2.cua.dk> 0 siblings, 2 replies; 13+ messages in thread From: Richard Stallman @ 2002-02-14 3:12 UTC (permalink / raw) Cc: emacs-devel, ding If it is non-nil, a non-blocking connect is attempted - if supported by the o/s (and the emacs code) - and when the connection is established, the argument (which must be a function) is called to initiate using the connection. Would it make sense to use the sentinel function for this? It already does a similar job. ^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: display-time, mail-icon and POP3 mailboxes 2002-02-14 3:12 ` Richard Stallman @ 2002-02-14 9:41 ` Kim F. Storm [not found] ` <5xlmdwe6ym.fsf@kfs2.cua.dk> 1 sibling, 0 replies; 13+ messages in thread From: Kim F. Storm @ 2002-02-14 9:41 UTC (permalink / raw) Cc: emacs-devel, ding Richard Stallman <rms@gnu.org> writes: > If it is non-nil, a non-blocking connect is attempted - if supported > by the o/s (and the emacs code) - and when the connection is > established, the argument (which must be a function) is called to > initiate using the connection. > > Would it make sense to use the sentinel function for this? It already > does a similar job. Yes, that sounds like a good idea. The steps for making a non-blocking open-network-stream could be: (defun my-stream-connected (p) ...) (defun my-sentinel (p s) (cond ((equal s "connected\n") ...) ;; connection established (my-stream-connected p)) ((equal s "failed\n") ...) ;; connect failed ) (t ...))) (defun ... (setq p (open-network-stream .... t)) (when p (cond ((eq (process-status p) 'connecting) ;; New return value ;; connecting, so set sentinel (set-process-sentinel p 'my-sentinel)) ((eq (process-status p) 'open) ;; non-blocking connect not supported, connected (my-stream-connected p)) ((eq (process-status p) 'closed) ;; failure... ;; will this happen? -- open-network-stream should return nil instead (delete-process p) ;; necessary? (setq p nil))))) Doesn't seem to be too complicated to use... -- Kim F. Storm <storm@cua.dk> http://www.cua.dk ^ permalink raw reply [flat|nested] 13+ messages in thread
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* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <5xlmdwe6ym.fsf@kfs2.cua.dk> @ 2002-02-15 10:36 ` Richard Stallman 0 siblings, 0 replies; 13+ messages in thread From: Richard Stallman @ 2002-02-15 10:36 UTC (permalink / raw) Cc: emacs-devel, ding (setq p (open-network-stream .... t)) (when p (cond ((eq (process-status p) 'connecting) ;; New return value ;; connecting, so set sentinel (set-process-sentinel p 'my-sentinel)) There may be a timing error here: each call to process-status allows the value to change. Perhaps the sentinel should be passed as an argument to open-network-stream, so that there is no time at which the connection is open and has no sentinel. ^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <5x3d07iojn.fsf@kfs2.cua.dk> 2002-02-12 16:32 ` Paul Jarc [not found] ` <m3u1sm4q4f.fsf@multivac.cwru.edu> @ 2002-02-13 15:38 ` Richard Stallman 2002-02-13 22:13 ` Kim F. Storm [not found] ` <5x3d0558tf.fsf@kfs2.cua.dk> 2 siblings, 2 replies; 13+ messages in thread From: Richard Stallman @ 2002-02-13 15:38 UTC (permalink / raw) Cc: emacs-devel, ding I haven't debugged this specifically with emacs, but in other programs, it has been necessary to make connect non-blocking with fcntl(s,F_SETFL,O_NONBLOCK) and then use the writefds of select to know when the connect has completed (at least on GNU/Linux). Would you like to write that code? ^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: display-time, mail-icon and POP3 mailboxes 2002-02-13 15:38 ` Richard Stallman @ 2002-02-13 22:13 ` Kim F. Storm [not found] ` <5x3d0558tf.fsf@kfs2.cua.dk> 1 sibling, 0 replies; 13+ messages in thread From: Kim F. Storm @ 2002-02-13 22:13 UTC (permalink / raw) Cc: emacs-devel, ding Richard Stallman <rms@gnu.org> writes: > I haven't debugged this specifically with emacs, but in other > programs, it has been necessary to make connect non-blocking with > fcntl(s,F_SETFL,O_NONBLOCK) and then use the writefds of select to > know when the connect has completed (at least on GNU/Linux). > > Would you like to write that code? I could give it a try - but I can only test it on GNU/Linux, so I will need to make some sensible choices about how to conditionally support this feature. I think I will need to test for the availability of HAVE_SELECT, F_SETFL, O_NONBLOCK, and HAVE_GETPEERNAME (which is used to check whether the connect actually succeeded). But that might not work on all systems, so I may need to add a BROKEN_NON_BLOCKING_CONNECT define which can be set for systems where this doesn't work (just to be defencive). There is currently no HAVE_GETPEERNAME check in configure, but I suppose that can be added (by someone who speaks autoconf :-) -- Kim F. Storm http://www.cua.dk ^ permalink raw reply [flat|nested] 13+ messages in thread
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* Re: display-time, mail-icon and POP3 mailboxes [not found] ` <5x3d0558tf.fsf@kfs2.cua.dk> @ 2002-02-15 10:37 ` Richard Stallman 0 siblings, 0 replies; 13+ messages in thread From: Richard Stallman @ 2002-02-15 10:37 UTC (permalink / raw) Cc: emacs-devel, ding I think I will need to test for the availability of HAVE_SELECT, F_SETFL, O_NONBLOCK, and HAVE_GETPEERNAME (which is used to check whether the connect actually succeeded). But that might not work on all systems, so I may need to add a BROKEN_NON_BLOCKING_CONNECT define which can be set for systems where this doesn't work (just to be defencive). Ok, that sounds fine. There is currently no HAVE_GETPEERNAME check in configure, but I suppose that can be added (by someone who speaks autoconf :-) If that function would be in libc, it is trivial--just see how the other such functions are handled and getpeername to the list. ^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2002-02-15 10:37 UTC | newest] Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <m3ofj1fwhj.fsf@Janik.cz> [not found] ` <200202081357.g18Dvfw05454@aztec.santafe.edu> [not found] ` <m3bsezk837.fsf@Janik.cz> [not found] ` <5x1yfva7m8.fsf@kfs2.cua.dk> 2002-02-10 18:39 ` display-time, mail-icon and POP3 mailboxes Pavel Janík 2002-02-10 19:57 ` Kim F. Storm [not found] ` <5xn0yhrtye.fsf@kfs2.cua.dk> 2002-02-11 18:48 ` Richard Stallman 2002-02-11 23:31 ` Kim F. Storm [not found] ` <a49p7s$657$1@quimby2.netfonds.no> 2002-02-12 16:25 ` Jan Vroonhof [not found] ` <5x3d07iojn.fsf@kfs2.cua.dk> 2002-02-12 16:32 ` Paul Jarc [not found] ` <m3u1sm4q4f.fsf@multivac.cwru.edu> 2002-02-13 0:27 ` Kim F. Storm [not found] ` <5x4rkmfcp8.fsf@kfs2.cua.dk> 2002-02-14 3:12 ` Richard Stallman 2002-02-14 9:41 ` Kim F. Storm [not found] ` <5xlmdwe6ym.fsf@kfs2.cua.dk> 2002-02-15 10:36 ` Richard Stallman 2002-02-13 15:38 ` Richard Stallman 2002-02-13 22:13 ` Kim F. Storm [not found] ` <5x3d0558tf.fsf@kfs2.cua.dk> 2002-02-15 10:37 ` Richard Stallman
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