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Why files get created with srwxrwxrwt under /dev/?

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Operating Systems Solaris Why files get created with srwxrwxrwt under /dev/?
# 1  
Old 09-15-2015
Why files get created with srwxrwxrwt under /dev/?
Code:
$ uname -a
SunOS myhost 5.11 11.2 sun4v sparc sun4v

I see following 0 byte (regular)files getting created under /dev/mydisks directory :

Code:
srwxrwxrwt   1 gusr   dba       0 Sep 14 23:57 VF_10
srwxrwxrwt   1 gusr   dba       0 Sep 14 23:57 DATA1
srwxrwxrwt   1 gusr   dba       0 Sep 14 23:57 DATA2

Code:
$ echo test > testfile
bash: testfile: Permission denied

Even though the command above returns an error I see the file being created with 'srwxrwxrwt'
Code:
$ ls -ltr
total 0
srwxrwxrwt   1 gusr   dba       0 Sep 14 23:57 testfile
srwxrwxrwt   1 gusr   dba       0 Sep 14 23:57 VF_10
srwxrwxrwt   1 gusr   dba       0 Sep 14 23:57 DATA1
srwxrwxrwt   1 gusr   dba       0 Sep 14 23:57 DATA2

$ file testfile
testfile:       socket

Note that this happens for regular files only under /dev directory. What setting or env. is causing this behavior?
Why 0 byte files? Why regular files get 'srwxrwxrwt' under /dev?
Are these really 'socket' files?
Last edited by DukeNuke2; 09-15-2015 at 03:56 AM..
# 2  
Old 09-15-2015
They are not regular files, which permissions would have started with a dash, but file named domain sockets as file rightly reports.
Last edited by jlliagre; 09-15-2015 at 07:16 AM..
# 3  
Old 09-15-2015
Well, my concern is when I try to create a regular file under /dev it gets created as 0 byte file with srwxrwxrwt. Why?
# 4  
Old 09-15-2015
Are you creating them, though? In your test above you get 'permission denied'. Which is what you'd expect trying to write to socket files, which don't work that way.
# 5  
Old 09-15-2015
My intention is to create a text file under /dev directory.
But whenever I try creating it through a program or even from the command line as mentioned earlier they get created as 'socket' files. Some weird process is doing this.
# 6  
Old 09-15-2015
I wonder if it's some odd property of the filesystem itself. I don't know Solaris in any detail but /dev/ is often its own pseudo-filesystem with unusual properties. Usually one doesn't make txt files under /dev.
# 7  
Old 09-15-2015
In fact, /dev is not a regular file system.

Source code for the open call on Illumos /dev file system is here: Cross Reference: /illumos-gate/usr/src/uts/common/fs/dev/sdev_vnops.c It's been a few years since that was forked from OpenSolaris code, but it's probably still really close to Solaris 11.2 /dev file system code.
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