> From: Andreas Schwab <[SNIP]>
> Subject: Re: mkfifo and tee within a function
> Sent: 2006-11-28 15:09
>
> Nathan Coulter <[SNIP]> writes:
>
> > Could anyone please provide a few pointers on how to accomplish this, and
> perhaps explain the results from the above examples?
>
> A process writing to a pipe that has no reader will receive EPIPE/SIGPIPE
> and die thereof by default. So it all depends on timing.
>
I think that is true for an anonymous pipe, but not for a named pipe. Timing
is not the issue here. A command which opens a named pipe for writing should
block until a reader comes online. In the following example, I get an error
with "source', but not with "cat". Why?
$>cmd_print () { mkfifo zout; tee zout & cat zout >/dev/null ; rm zout; }
$>cmd_print <<EOF
> date
> EOF
[1] 5263
date
[1]+ Done tee zout
$>cmd_print () { mkfifo zout; tee zout & source zout ; rm zout; }
$>cmd_print <<EOF
> date
> EOF
[1] 5267
$>date
tee: zout: Broken pipe
Finally, my workaround to this is:
$>cmd_print () { mkfifo zout; tee zout & eval "$(cat zout)" ; rm zout; }
$>cmd_print <<EOF
> date
> EOF
[1] 5274
date
Tue Nov 28 11:21:19 CST 2006
[1]+ Done tee zout
$>
--
Nathan Coulter
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