[Tcl-bugs] [ tcl-Bugs-219149 ] bad interaction of input redirect from named pipe with backg

[<no...@so...>]

Bugs item #219149, was opened at 2000-10-26 01:02
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=219149&group_id=10894

Category: 26. Channel Types
Group: = 8.0p2
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Andreas Kupries (andreas_kupries)
Summary: bad interaction of input redirect from named pipe with backg

Initial Comment:
OriginalBugID: 950 Bug
Version: 8.0p2
SubmitDate: '1998-12-14'
LastModified: '1999-12-07'
Severity: SER
Status: Assigned
Submitter: pat
ChangedBy: hobbs
OS: Linux
Machine: Other
FixedDate: '2000-10-25'
ClosedDate: '2000-10-25'


Name: Harald

ReproducibleScript:
Run the following script.

#!/bin/sh
# exec tclsh8.0 "$0" 

exec mkfifo fifo
puts [exec cat <fifo >@stdout &]

ObservedBehavior:
Although there is an `&' at the end
of the exec-arguments, the exec does
not return.

DesiredBehavior:
If `&' is at the end of exec-args,
exec should always return soon, independent of input redirection.


There is a not-so-perfect workaround. The fifo can be opened with NONBLOCK and the handle to the opened fifo can be used to redirect input. However then the child-process sees a non-blocking
input channel, which is probably not what was intended.
--
Verified in 8.2.2 on Solaris. 
-- 12/07/1999 hobbs



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>Comment By: Don Porter (dgp)
Date: 2002-07-05 16:34

Message:
Logged In: YES 
user_id=80530

Is this still a valid bug report?

If so, it may be the oldest Open bug in Tcl.

----------------------------------------------------------------------

Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-09-11 16:00

Message:
Logged In: YES 
user_id=75003

Harald = <ki...@ii...> ...
Harald Kirsch, author of 'bras'.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=219149&group_id=10894