Implementing application locks within SQL Server (Distributed Locking Pattern)
In my application I have to perform a distributed locking pattern. Because we already have an instance of SQL Server to use, we decided that it would be easiest to implement the locking at SQL layer of...
View ArticleWhy does “cat /tmp/out1 > /tmp/in2 &” appear as “bash” with the “ps” command?
Consider: mkfifo /tmp/out1 mkfifo /tmp/in2 cat /tmp/out1 > /tmp/in2 & When I run ps it appears as bash in the CMD section. Why?
View Articlecreate several /dev/xconsole files automatically upon boot
I understand from my previous question that the /dev/xconsole file can be created using mkfifo. On my system (Debian Wheezy), /dev/xconsole gets created automatically. I am wondering who creates it...
View ArticleAm I missing something for mkfifo to work?
I am trying to get frontend-term/omxplayer-console working on a raspberry pi. Specifically I am referring to the way I am supposed to be able to press keyboard characters and it translates those into...
View ArticleWhy does my named pipe keep getting modified?
I have a named fifo created from a C program like this: res = mkfifo("/home/myfolder/myfifo", 0666); after that there are only reads and writes. Now, from this answer : Does a named pipe change the...
View ArticleCreate a named pipe / fifo that executes a command when read
I’m looking to supply a process that only reads from a local file with content from an http URL. The process is a daemon that is hard-coded to read a specific file in it’s current working directory and...
View ArticleSetup and hold time violation constraints for Xilinx Fifo generator
I have a problem concerning the Xilinx Fifo generator and timing contraints described in the fifo manual. I am using the fifo generator version 9.2 (manual ) to generate a fifo. I would like to insert...
View ArticleNamed pipes: several experiments leads to confusion [closed]
I’ve come across various articles and SO questions and I am still confused about something that I use on daily basis, but never realized how confusing it can be. I am experimenting with (named) pipes...
View ArticleTriggering zero-byte reads on FIFO/pty
I’d like to know how to emulate the ICANON behavior of ^D: namely, trigger an immediate, even zero-byte, read in the program on the other end of a FIFO or PTY or socket or somesuch. In particular, I...
View ArticleHow to make a fifo in C?
I have to use mkfifo in my C program in Ubuntu. But I have an error when I compile: no such file or directory . I think the problem because I have not set the panel_fifo environment variables. But I...
View ArticleBASH: Fifo troubles – seems selective about input
So I am having a problem with a BASH service in Debian 7 that I’ve been working on for quite a while and that randomly started having trouble with its fifo, or so it seems. It is based on kind of your...
View ArticleWhy does `cat` seem to iterate over JSON arrays?
I’m puzzled by this behaviour of cat when trying to output a heredoc containing JSON in bash 3.2: input: $ cat <(cat <<EOF > {"x":[{"a":1,"b":2}]} > EOF) output: {"x":["a":1]}...
View ArticleWhy process does not (seem to) exist before fifo read
I have a trivial Python script: #!/usr/bin/python import os, sys sys.stderr.write('I am %s' % os.getpid()) sys.stderr.flush() print "hello" sys.stderr.write('I am done') When I run this script from...
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FIFO-related data transmission problems between microcontroller and PC
I have a situation in which a microcontroller is to perform a large number of ADC conversions and format the results into commands (or data packages) and send these to a PC using the UART. In order to...
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FIFO for spartan 3AN : no storage on board but ok in simulation
I made a FIFO using the Core Generator and I’m trying to implement a code that use it… 1) By putting the switch (T9) ON, I start transmitting some datas to my fifo (Here H-e-l-l-o for test) 2) By...
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