Public bug reported:
I use popen() to send data to xmgr (the old Motif plotting app), but might be
reproduced with other apps listening to a pipe.
The fact is that I want the xmgr display the data and the calling program run
after xmgr window appears, so I used to do this trick:
file = popen( "cat - | xmgr -pipe &");
...
fprintf( file, "%f %f\n", x[i], y[i] );
...
pclose( file );
When bash is /bin/sh the code above works OK.
When dash is /bin/sh the "xmgr -pipe" never gets the data and the calling app
closes randomly.
When the "&" is not used, bash and dash work (but the app does not go on
until the xmgr is closed, so this is not the way I want it to work)
Is this a dash bug or a bash feature? I cannot see if it is or not from
what it says at popen manual page. I'm not a Unix guru neither.
I've work-around this with "sudo dpkg-reconfigure dash" so I can use
bash as /bin/sh instead of dash and recover the old behaviour
** Affects: dash (Ubuntu)
Importance: Undecided
Status: Unconfirmed
** Changed in: gksu (Ubuntu)
Sourcepackagename: gksu => dash
--
popen() C call behaviour changes from bash to dash
https://launchpad.net/bugs/69930
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