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Communicate with multiple process using named pipe
Post 302574491 by nimesh on Thursday 17th of November 2011 11:33:21 AM
11-17-2011
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1. UNIX for Advanced & Expert Users
Hi All,
I am facing a vague issue while trying to make two process talk to each
other using named pipe.
read process
=========
The process which reads, basically creates FIFO using
mkfifo - ret_val = mkfifo(HALF_DUPLEX, 0666);) func.
It then opens the pipe using open func - fd =... (1 Reply)
Discussion started by: sharanbr
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Hi All,
I am facing a vague issue while trying to make two process talk to each
other using named pipe.
read process
=========
The process which reads, basically creates FIFO using
mkfifo - ret_val = mkfifo(HALF_DUPLEX, 0666) func.
It then opens the pipe using open func - fd = open... (2 Replies)
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Gurus,
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I did
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Hi,
I want to use a Named pipe to get input from a growing file for further processing. When I prototype this scenario using a while loop, the data is not written to the named pipe.
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Hi,
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Ok, I can't seem to figure this out or find anything on the web about this.
I'm on Sun Solaris, UNIX.
I have the following test script:
#!/bin/ksh
touch test.file
LOG=./tmp.log
rm -f ${LOG}
PIPE=./tmp.pipe
mkfifo ${PIPE}
trap "rm -f ${PIPE}" EXIT
tee -a ${LOG} < ${PIPE} &
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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)