Questions tagged [mkfifo]
The mkfifo tag has no summary.
28 questions
-1
votes
1
answer
100
views
Serving a file (e.g. in Apache) from a named pipe (made with mkfifo)
Let's say I use Apache, and that I am in /var/www/html/. I do:
mkfifo test.tar
tar cvf - ~/test/* > test.tar &
In a browser, when trying to download http://localhost/test.tar I get:
...
- 2,609
5
votes
2
answers
628
views
Can I use named pipes to achieve temporal uncoupling?
I have 2 applications that pipe their data:
application1 | application2
Basically, application1 generates a log with events that application2 processes. The issue is that I frequently update ...
- 153
7
votes
1
answer
709
views
FIFO capture using cat not working as intended?
Hi I am trying to use a Unix FIFO to communicate between a Python script and a shell script. The intention is for the shell script to capture all output of the python script. So far I have the ...
- 345
-1
votes
3
answers
233
views
Empty named pipe
I try to create a named pipe, however, when I store data in it, it is still empty.
$ mkfifo myfifo
$ cat > myfifo
123
123
123
^[[D
^C
$ ls > myfifo
^C
$ cat < myfifo
(no output)
- 131
0
votes
1
answer
426
views
Setting large fs.pipe-max-size
When I increase fs.pipe-max-size like so:
echo "fs.pipe-max-size = N" >> /etc/sysctl.conf
sysctl -p
(N is ~4-10Mbytes)
And use F_SETPIPE_SZ to change named pipe sizes to N, sometimes ...
- 125
0
votes
0
answers
46
views
Strange incongruent output for both nc and fifo
I have this exact code:
#!/bin/bash
gtimeout(){
if type -f gtimeout &> /dev/null; then
command gtimeout "$@"
else
timeout "$@"
fi
}
export -f gtimeout;
...
- 10.9k
1
vote
0
answers
275
views
Unable to redirect stdout for background terraform process after it received input from named pipe
I have a terraform file:
terraform {
required_version = "1.3.5"
}
locals {
a = "foo"
b = "bar"
}
in a bash terminal, I can do:
$ echo "local.a" | ...
- 242
1
vote
1
answer
198
views
Speed up grep usage inside bash script
I am currently working on creating a bash script that is supposed to process large log files from one of my programs. When I first started the script took around 15 seconds to complete which wasn't ...
- 11
1
vote
1
answer
314
views
Process (mplayer) doesn't read from named pipe when started from webserver (lighttpd)
tl;dr
$ sudo -u www-data mplayer -slave -input file=/srv/mplayer.fifo -playlist /srv/list &
$ lsof /srv/mplayer.fifo | tail +2
mplayer 21059 www-data 4u FIFO 179,2 0t0 2359331 /srv/...
- 121
0
votes
1
answer
623
views
Adding 'Progress bar / counter' to a parallelised For Loop
I've been greatly inspired by this question: Parallelize a Bash FOR Loop to parallelise some tools I've written that involve very loooong while read loops (ie doing the same task / set of tasks ...
user279851
0
votes
1
answer
532
views
How to guarantee that that only a specific process reads from a named pipe?
Suppose that, at time (1), I create a named pipe using Python with the goal that eventually this Python process would write something to that named pipe. Why? Because, at time (2), there is another ...
- 173
3
votes
1
answer
1k
views
How to pipe all output streams to another process?
Take the following Bash script 3-output-writer.sh:
echo A >&1
echo B >&2
echo C >&3
Of course when ran as . 3-output-writer.sh it gets the error 3: Bad file descriptor, because ...
2
votes
2
answers
81
views
Process in Pipe which Processes 256 bytes at a Time
I have a c program on a Cyclone 5 that does an FFT using the connected FPGA. This program currently takes 256 bytes from stdin and then process it gives the FFT results on stdout. I run it like this ...
- 123
2
votes
1
answer
220
views
Using tee and paste results in a deadlock
I am trying to redirect stdout of a command into two "branches" using tee for separate processing. Finally I need to merge results of both "branches" using paste. I came up with the following code for ...
- 21
0
votes
1
answer
65
views
Why don't named pipes respect the order at which readers were attached?
I have this test script:
#!/usr/bin/env bash
fif="foooz"; rm "$fif" ; mkfifo "$fif"
( cat "$fif" | cat && echo "1") &
sleep 0.1
( cat "$fif" | cat && echo "2") &
sleep 0....
- 10.9k