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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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MKFIFO(1)						    BSD General Commands Manual 						 MKFIFO(1)

NAME
mkfifo -- make fifos SYNOPSIS
mkfifo [-m mode] fifo_name ... DESCRIPTION
mkfifo creates the fifos requested, in the order specified. By default, the resulting fifos have mode 0666 (rw-rw-rw-), limited by the cur- rent umask(2). The options are as follows: -m Set the file permission bits of newly-created fifos to mode, without respect to the current umask. The mode is specified as in chmod(1). In symbolic mode strings, the ``+'' and ``-'' operators are interpreted relative to an assumed initial mode of ``a=rw'' mkfifo requires write permission in the parent directory. mkfifo exits with 0 if successful, and with >0 if an error occurred. LEGACY DESCRIPTION
In legacy mode, the fifo's file permission bits are always limited by the current umask. For more information about legacy mode, see compat(5). SEE ALSO
mkdir(1), rm(1), umask(1), mkfifo(2), umask(2), compat(5), mknod(8) STANDARDS
The mkfifo utility is expected to be IEEE Std 1003.2-1992 (``POSIX.2'') compliant. HISTORY
mkfifo command appeared in 4.4BSD. 4.4BSD January 5, 1994 4.4BSD
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