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..
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FSTAT(8) System Manager's Manual FSTAT(8)
NAME
fstat - file status
SYNOPSIS
fstat [ -u user ] [ -p pid ] [ filename... ]
DESCRIPTION
Fstat identifies open files. A file is considered open if a process has it open, if it is the working directory for a process, or if it is
an active pure text file. If no options are specified, fstat reports on all open files.
Options:
-u Report all files open by a specified user.
-p Report all files open by a specified process id.
filename...
Restrict reports to the specified files. If the file is a block special file, fstat additionally reports on any open files on that
device, treating it as a mounted file system.
The following fields are printed
USER The username of the owner of the process.
CMD The command name of the process.
PID The process id.
FD The file number in the per-process open file table. The special names "text" and "wd" mean that the file is the pure text inode or
the working directory for the process. If the file number is followed by an asterick (*), then the file is not an inode, but either
a socket, fifo, or has an error of some kind. In this case the rest of the entry is variable format, doesn't correspond to the rest
of the headings, and is enclosed in parenthesis. The following paragraph describing sockets will explain the variable format.
DEVICE
Major minor number of the device this file exists on.
INODE The inode number of the file.
SIZE The size in bytes of the file.
TYPE The type of the file. (see sys/file.h)
Sockets The formating of open sockets depends on the protocol domain. In all cases the first field is the domain name, the second field is
the socket type (stream, dgram, etc), and the third is the socket flags field (in hex). The remaining fields are protocol dependent. For
tcp, it is the address of the tcpcb, and for udp, the inpcb (socket pcb). For unix domain sockets, its the address of the socket pcb and
the address of the connected pcb (if connected). Otherwise the protocol number and address of the socket itself are printed. The idea is
not to duplicate netstat, but to make available enough information for further analysis. For example, the addresses mentioned above are
the addresses which the "netstat -A" command would print for tcp, udp, and unixdomain. Note that since pipe(2) is implemented with sock-
ets, a pipe appears as a connected unix domain stream socket. A unidirectional unix domain socket indicates the direction of flow with an
arrow ("<-" or "->"), and a full duplex socket shows a double arrow ("<->").
BUGS
Socket information clutters the output.
Since fstat takes a snapshot of the system, it is only correct for a very short period of time.
SEE ALSO
ps(1), pstat(8)
4th Berkeley Distribution December 12, 1987 FSTAT(8)