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Bug 594536 - Extra fork when tcsh processes backquotes
Extra fork when tcsh processes backquotes
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: tcsh (Show other bugs)
All Linux
high Severity high
: rc
: ---
Assigned To: Jaromír Končický
BaseOS QE - Apps
: Patch, ZStream
Depends On:
Blocks: 640251 673556 688170 689383
  Show dependency treegraph
Reported: 2010-05-20 19:42 EDT by Bryan Mason
Modified: 2018-11-14 15:11 EST (History)
6 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 689383 (view as bug list)
Last Closed: 2013-09-23 07:04:39 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Proposed Patch (701 bytes, patch)
2010-05-20 19:45 EDT, Bryan Mason
no flags Details | Diff

  None (edit)
Description Bryan Mason 2010-05-20 19:42:51 EDT
Description of problem:

    When tcsh-6.14 performs command substitution within backquotes, an
    extra fork() is performed.  this can cause issues when a command
    run within the backquotes wants to find the PID of the main tcsh
    process from which it was fork()ed.

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


How reproducible:


Steps to Reproduce:

    1. Run "echo `pstree -p $$`"
Actual results:


    (note that tcsh forks twice)
Expected results:


    (note that tcsh only forks once to run pstree)

Additional info:

    This has been reported and accepted upstream:


    This was not a problem with tcsh-6.13
Comment 1 Bryan Mason 2010-05-20 19:45:07 EDT
Created attachment 415541 [details]
Proposed Patch

This patch assumes that the patch in Bug 531353 has already been applied.

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