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[Tcl-bugs] [ expect-Bugs-1279388 ] broken pipe with more introduced in expect-5.43, 5.41 works.
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From: SourceForge.net <no...@so...> - 2005-09-20 18:56:09
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Bugs item #1279388, was opened at 2005-09-01 07:39 Message generated for change (Comment added) made by andreas_kupries You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=113179&aid=1279388&group_id=13179 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None >Priority: 5 Submitted By: Claudio Fontana (sick_soul) Assigned to: Andreas Kupries (andreas_kupries) Summary: broken pipe with more introduced in expect-5.43, 5.41 works. Initial Comment: Hello, there seems to be a bug introduced in expect-5.43, where standard output can not be piped to more anymore. Here is my test and the answer on my system (GNU/Linux Slackware 10.1, customized, Kernel 2.6.12 on Intel P4): --------test.tcl-------- set biglist [list somestring somethingelse] for { set i 0 } { $i < 50 } { incr i } { lappend biglist more_stuff } foreach element $biglist { puts $element } ------------------------- # now use expect 5.41 as interpreter and pipe output through more $ /usr/bin/expect expect1.1> exp_version 5.41.0 expect1.2> exit $ /usr/bin/expect test.tcl | more somestring somethingelse more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff --More-- ... # now test using expect-5.43 as interpreter and pipe through more $ /home/claudio/usr/bin/expect expect1.1> exp_version 5.43.0 expect1.2> exit $ /home/claudio/usr/bin/expect test.tcl | more ... more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff more_stuff error writing "stdout": broken pipe while executing "puts $element" ("foreach" body line 2) invoked from within "foreach element $biglist { puts $element }" (file "test.tcl" line 7) ---------------------------------------------------- This error does not always happen, sometimes I get five or more clean runs before getting the broken pipe. Repeated runs with expect-5.41 never show the error. ---------------------------------------------------------------------- >Comment By: Andreas Kupries (andreas_kupries) Date: 2005-09-20 11:56 Message: Logged In: YES user_id=75003 Note: We do _not_ see ourselves as a fork. More of a branch were bugfixes can be added quickly as we need them. Whenever a new offficial release comes out it is integrated here. That is also why see keep Don as maintainer. He can get the code from here, and update stuff here. However he is not so fond of CVS and does not like working with it. ---------------------------------------------------------------------- Comment By: Claudio Fontana (sick_soul) Date: 2005-09-20 11:04 Message: Logged In: YES user_id=790036 I didn't know that the sf expect project and Don Libes releases diverged. But Don Libes appears as a project admin; that's a bit confusing. I already sent the bug report to Don Libes mail address at nist dot gov some eons ago, but he did not answer. ---------------------------------------------------------------------- Comment By: Andreas Kupries (andreas_kupries) Date: 2005-09-19 16:49 Message: Logged In: YES user_id=75003 Ok, it was not clear from the bug report that you were using Don Libes sources. The Expect sources here in SF may and currently do diverge from the official sources, having a number of fixes and things which are not in Don's source tree yet. Note that the problem is solved for you when a new source release of expect is available __to which Don has added fixes for the problems as well__. While we do send Don the fixes we put into the SF CVS, that does not mean that he will accept them into his sources. He may do nothing. Or he may choose to write his own fixes. ---------------------------------------------------------------------- Comment By: Claudio Fontana (sick_soul) Date: 2005-09-19 16:18 Message: Logged In: YES user_id=790036 >Hi Claudio. Hello, >First. I see that you provide me with a version number. Can >you please provide me with a bit more detail ? I.e. the >revision number of the Expect sources you retrieved from the >Expect CVS here at SourceForge (Date). I just report a problem in the official 5.43 file release. I am distributing my software with the expect source, among other packages, with an installer, and I cannot expect(1) all users to be able to update the expect version in the fullpack release from CVS. I also have to consider package dependencies, so I need to rely on a specific offical file release. >Second. I am unable to reproduce the problem on my Llinux >system and using the CVS Head of Expect here at SF. >[cut] Neither can I. The latest CVS seems to contain a fix already. For me, the problem is solved as soon as a new source release of expect is available. Thanks Claudio ---------------------------------------------------------------------- Comment By: Hemang Lavana (hemanglavana) Date: 2005-09-19 12:59 Message: Logged In: YES user_id=81875 Update: the problem occured as sooned as the output was piped to more cmd. I didn't have to press any keys. As per Andreas suggestion, I compiled expect from CVS head and the problem does NOT occur anymore. This bug can be marked as resolved from my side. Hemang. ---------------------------------------------------------------------- Comment By: Andreas Kupries (andreas_kupries) Date: 2005-09-19 12:22 Message: Logged In: YES user_id=75003 Hi Claudio. First. I see that you provide me with a version number. Can you please provide me with a bit more detail ? I.e. the revision number of the Expect sources you retrieved from the Expect CVS here at SourceForge (Date). Second. I am unable to reproduce the problem on my Llinux system and using the CVS Head of Expect here at SF. Neither with your script, nor Hemang's. does the message 'broken pipe' appear when quit "more" ? Or when "more" is running, without you doing anything ? Or do you have to scroll in the output of "more" ? (If your big list is not long to require scrolling you might extend it to 500 elements). With Hemang's script I was able to get the message when I exit "more", and Expect is still writing. In that situation I actually expect the message, because then the pipe is broken and Expect notified of the fact. So that would not be a bug IMHO. Hence my questions regarding the detailed timing of the message. ---------------------------------------------------------------------- Comment By: Hemang Lavana (hemanglavana) Date: 2005-09-16 21:09 Message: Logged In: YES user_id=81875 Hi, We are also seeing the same problem on solaris8, expect5.43 version. Here's a simplied version of the script to consistently reproduce this problem: godel:153> cat stdout-bug.tcl package require Expect puts exp_version=[package provide Expect] set biglist [string repeat [list somestring somethingelse] 10000] while {1} { puts $biglist } godel:154> /tmp/hlavana/ActiveTcl/bin/tclsh stdout-bug.tcl | more exp_version=5.43.0 somestring somethingelsesomestring somethingelsesomestring somethingelsesomestri ng somethingelsesomestring somet... ng somethingelsesomestring somethingelsesomestring somethingelsesomestring somet error writing "stdout": broken pipe while executing "puts $biglist" ("while" body line 2) invoked from within "while {1} { puts $biglist }" (file "stdout-bug.tcl" line 5) godel:155> Hemang. ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2005-09-05 12:37 Message: Logged In: NO requiring package Expect is not necessary to reproduce the error if you use the expect binary as the interpreter. If you run the tclsh interpreter, instead, the require package Expect line is necessary. ---------------------------------------------------------------------- Comment By: Claudio Fontana (sick_soul) Date: 2005-09-05 01:48 Message: Logged In: YES user_id=790036 ERRATA: add "package require Expect" at the beginning of the script to obtain the error described. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=113179&aid=1279388&group_id=13179 |
