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Full Discussion: IPC between processes, pipes, etc
Top Forums Programming IPC between processes, pipes, etc Post 302425590 by Corona688 on Friday 28th of May 2010 02:01:33 PM
Old 05-28-2010
You're missing my point. You can't connect processes that already exist with anonymous pipes. Therefore the instructions you want, connecting any 3 processes with pipes, simply don't exist.

All of the pipes must be created in the parent first. That way, when it creates children, they will share these pipes, allowing them(and of course the parent) to redirect their I/O through them how they please. To give more detailed instructions I'll need to know which of your processes created which others.
 

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LEARN ABOUT HPUX

streampipes

streampipes(5)							File Formats Manual						    streampipes(5)

NAME

       streampipes - force all pipes to be STREAMS-based

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION

       This tunable determines the type of pipe that is created by the system call.  If set to the default value of zero, all pipes created by are
       normal HP-UX file-system pipes.	If the value is non-zero, creates STREAMS-based pipes, and STREAMS modules can be pushed onto the  result-
       ing stream.

       If this tunable is set to a non-zero value, the and module and driver must be configured in file

   Who Is Expected to Change This Tunable?
       Any customer.

   Restrictions on Changing
       Changes to this tunable take effect at next reboot.

   When Should the Tunable Be Turned On?
       If the customer uses applications that require STREAMS-based pipes, this tunable should be turned on.

   What Are the Side Effects of Turning the Tunable On?
       STREAMS-based pipes performance may differ from normal file system pipes.

   When Should the Tunable Be Turned Off?
       If the customer does not need the STREAMS-based pipes, this tunable should be turned off.

   What Are the Side Effects of Turning the Tunable Off?
       Applications that try to push STREAMS modules onto the pipe will fail.

   What Other Tunable Should Be Changed at the Same Time as This One?
       If this tunable is set to a non-zero value, the and module and driver must be configured in the file

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters						    streampipes(5)
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