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Full Discussion: Struggling with mkfifo
Top Forums UNIX for Dummies Questions & Answers Struggling with mkfifo Post 50034 by alan on Thursday 15th of April 2004 12:05:38 PM
Old 04-15-2004
Quote:
I too am interested in which version of unix that alan is using. Alan since you are new to unix, you may not yet know about the uname command. "uname -a" is a command that will tell us about your version of unix.
I am familiar with `uname -a`: I put my OS info in my first post but I guess it got lost in the clutter. I am on HP-UX B.11.00 U 9000/800.

Quote:
Were you running as root? Did you try the mkfifo command instead? Also after you create bla, run the command "ls -l bla" and post the results of that.
I am NOT running as root. I know nothing about my user ("dev1") permissions but I am certain that I don't have super-user privilege. I have tried to use both `mknod` and `mkfifo`in my /home directory but to no avail:


[dev1@la]/home/dev1% mkfifo bla
[dev1@la]/home/dev1% cat bla &
[1] 10907
[dev1@la]/home/dev1% echo "hello world" > bla
ksh: bla: cannot create
[dev1@la]/home/dev1% ls -l bla
prw-rw-r-- 1 dev1 cadev 0 Apr 15 10:43 bla|
[dev1@la]/home/dev1%

I got the same error msg when I use "mknod". Obviously (see the "p"), I am able to create my fifo but it is as far as I can go.

I am confused: If I look at the permission bits, it seems that my fifo is usable by my userid for read/write, correct?

Can this be related to my user permissions? How can I know which those are? I have no super-user privileges so SAM is not accessible...
 

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LEARN ABOUT DEBIAN

poc-fec

POC-FEC(1)							   User Command 							POC-FEC(1)

NAME

       poc-fec - send FEC MP3 streams

SYNOPSIS

       poc-fec [ -s address ] [ -p port ] [ -t ttl ] [ -q ] [ -k fec_k ] [ -n fec_n ] files...

DESCRIPTION

       poc-fec is a streaming server sending mp3 data using a custom FEC protocol. The streamed MP3 frames are first decomposed in autonomous data
       units (ADUs). These ADUs are grouped into ADU groups, which are encoded redundantly using a FEC method by Luigi Rizzo. A group of k ADUs is
       encoded	as  n  data  packets.  Any k of these n data packets is sufficient to recover the original k ADUs. It sends the files in the order
       given on the command-line. Use the filename - to stream from standard input. Normally, the FEC protocol is  used  to  stream  to  multicast
       groups.

OPTIONS

       -s address
	      Specify the address to send to (default 224.0.1.23).

       -p port
	      Specify the port to send to (default 1500).

       -t ttl Specify the TTL parameter to be set on outgoing parameters (default 1).

       -q     Don't output any information on standard error.

       -k fec_k
	      Specify the number of ADUs that will be encoded as an ADU group (default 20).

       -n fec_n
	      Specify the number of packets that the ADU groups will be encoded to (default 25). This number must be greater than the fec_k param-
	      eter.

EXAMPLES

       poc-fec -s 224.0.1.24 -p 8989 -t 2 -k 16 -n 32 bla.mp3
	      Send the file bla.mp3 using the RTP RFC fec protocol to the address 224.0.1.24 on port 8989, and set the TTL to  2.  MP3	frames	of
	      bla.mp3 are converted to ADUs and grouped in ADU groups of 16 ADUs. These 16 ADUs are encoded into 32 packets and streamed. A client
	      will have to receive at least 16 packets to recover the original ADUs.

AUTHORS

       Manuel Odendahl <manuel@bl0rg.net>, Florian Wesch <dividuum@bl0rg.net>

								   February 2005							POC-FEC(1)
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