Re: [Persistentperl-users] Bug in 2.22 on Fedora Core 1

[Sam H. <sa...@da...>]

There's nothing in the code that sets the action for SIGCHLD to SIG_IGN.


 > Hi,
 > 
 > I use persistentperl 2.22 on FC1 with OpenWebmail.
 > 
 > The following error is presented in the messages log:
 > 
 > May 15 06:00:01 gazelle kernel: application bug: perperl_backend(8615) has 
 > SIGCHLD set to SIG_IGN but calls wait().
 > May 15 06:00:01 gazelle kernel: (see the NOTES section of 'man 2 wait'). 
 > Workaround activated.
 > 
 > and reading the notes section of the man 2 wait page, has the following on 
 > this error:
 > 
 >        The Single Unix Specification describes a flag SA_NOCLDWAIT  (not  sup-
 >        ported under Linux) such that if either this flag is set, or the action
 >        for SIGCHLD is set to SIG_IGN then children that  exit  do  not  become
 >        zombies and a call to wait() or waitpid() will block until all children
 >        have exited, and then fail with errno set to ECHILD.
 > 
 >        The original POSIX standard left the behaviour of  setting  SIGCHLD  to
 >        SIG_IGN  unspecified.   Later  standards,  including  SUSv2  and  POSIX
 >        1003.1-2001 specify the behaviour just described as  an  XSI-compliance
 >        option.   Linux  does  not conform to the second of the two points just
 >        described: if a wait() or waitpid() call is made while SIGCHLD is being
 >        ignored,  the  call  behaves  just  as  though  SIGCHLD  were not being
 >        ignored, that is, the call blocks until the next child  terminates  and
 >        then returns the PID and status of that child.
 > 
 > Can we fix this?
 > 
 > Michael.
 > 
 > 
 > 
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