Bug 177242

Summary:	Bash is not ignoring SIGPIPE
Product:	[Fedora] Fedora	Reporter:	Brian Gerst <brgerst>
Component:	bash	Assignee:	Tim Waugh <twaugh>
Status:	CLOSED NOTABUG	QA Contact:	Ben Levenson <benl>
Severity:	medium	Docs Contact:
Priority:	medium
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OS:	Linux
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Last Closed:	2006-01-10 14:27:52 UTC	Type:	---
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Description Brian Gerst 2006-01-08 05:05:35 UTC

From Bugzilla Helper:
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Description of problem:
According to the bash FAQ:
As of bash-3.1, bash will not report SIGPIPE errors by default.  You
can build a version of bash that will report such errors.

But it is still displaying errors:
cg-log: line 210: echo: write error: Broken pipe


Version-Release number of selected component (if applicable):
bash-3.1-2

How reproducible:
Always

Steps to Reproduce:
1. Use the cogito command, cg-log, which invokes less
2. The error shows when you exit less.
  

Actual Results:  cg-log: line 210: echo: write error: Broken pipe


Expected Results:  No error.

Additional info:

Comment 1 Tim Waugh 2006-01-09 14:46:23 UTC

Please provide a smaller, self-contained test case.  I haven't been able to
reproduce this.

while :; do echo foo; done | head -n1

..generates a SIGPIPE, and does not give out a warning.  What does that line do
when you run it?

Comment 2 Brian Gerst 2006-01-09 15:11:29 UTC

I found the culprit.  cg-log does "trap exit SIGPIPE".  Commenting out this line
silences the error.  Since older bashes didn't give the error message with this
trap in place, is it a bash regression, or should the script just not use the trap?

Comment 3 Tim Waugh 2006-01-09 15:48:29 UTC

Reported upstream.  Thanks for the smaller test case:

bash -c 'trap exit SIGPIPE; echo foo' | :

Comment 4 Tim Waugh 2006-01-10 14:27:52 UTC

Intentional behaviour change.