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Top Forums UNIX for Advanced & Expert Users Named pipes using MKS Toolkit Post 302433115 by ArndW on Monday 28th of June 2010 02:37:54 PM
Old 06-28-2010
Named pipes using MKS Toolkit

I'm not sure whether or not this question really belongs in this forum and will accept rebuke should I have mistakenly put it in the wrong place (hopefully the rebuke will be accompanied by an answer, though)

I wish to implement named pipe communication between two process using MKS Toolkit. I have used the "mkfifo" command to create the named pipe in the appropriate directory, but I cannot find a way, from the command line, to write to the pipe without destroying it. If I do something like "ls > mypipe.fifo" then the pipe is destroyed and the mypipe.fifo is converted to a normal text file.

I found a reference to using the MKS call to popen() in order to open a pipe, but am not able (allowed) to write and install a user-written c program on the MKS installation. Thus I am looking for some method of writing to the named pipe using a command line call and haven't found anything in the documentation or by searching the web.
 

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mknod(8)						      System Manager's Manual							  mknod(8)

NAME
mknod - Creates a special file SYNOPSIS
/usr/sbin/mknod special_file [ b major_device# minor_device# | c major_device# minor_device#] /usr/sbin/mknod filename p DESCRIPTION
The mknod command makes a directory entry. The first argument is the name of the special device file. Select a name that is descriptive of the device. The mknod command has two forms. In the first form, the second argument is the b or c flag. The last two arguments are numbers specifying the major_device, which helps the operating system find the device driver code, and the minor_device, the unit drive, or line number, which may be either decimal or octal. The assignment of major device numbers is specific to each system. You can determine the device numbers by examining the conf.c system source file. If you change the contents of the conf.c file to add a device driver, you must rebuild the kernel. In the second form of mknod, you use the p flag to create named pipes (FIFOs). Only the superuser can create a character or device special file. FLAGS
Indicates that the special file corresponds to a block-oriented device (disk or tape) Indicates that the special file corresponds to a character-oriented device Creates named pipes (FIFOs) EXAMPLES
To create the special file for a new drive, /dev/disk/dsk20, with a major device number of 1 and a minor device number of 2, enter: mknod /dev/disk/dsk20 b 1 2 This command creates the special file, /dev/disk/dsk20, which is a block special file with major device number 1 and minor device number 2. To create a pipe named fifo, enter: mknod fifo p This command creates the pipe fifo, which is not necessarily in the current directory. FILES
Specifies the command path Specifies the system device numbers specification file delim off mknod(8)
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