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Full Discussion: client app not letting go of socket
Top Forums UNIX for Dummies Questions & Answers client app not letting go of socket Post 47857 by Perderabo on Friday 20th of February 2004 09:13:33 AM
Old 02-20-2004
The local program did a shutdown() or a close() on the socket in question. This sent a FIN packet to the remote system and put the socket in FIN_WAIT_1. The remote system ACKED the FIN packet and the local system got the ACK. That moved the socket to FIN_WAIT_2.

The idea is that at some point the remote system will close() or shutdown() its side on the socket. When that happens, the remote system will send a FIN. The local system will then ACK that FIN and move the socket to TIME_WAIT.

But if the remote system had a hung program, the remote system's kernel will still ACK the first FIN. Then if the remote system is rebooted, things will hang forever.

FIN_STATE_2 happens a lot when the remote systems are pc's. You must not run netstat very much.
 

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LEARN ABOUT OPENSOLARIS

fs

default_fs(4)							   File Formats 						     default_fs(4)

NAME

       default_fs, fs - specify the default file system type for local or remote file systems

DESCRIPTION

       When  file  system  administration commands have both specific and generic components (for example, fsck(1M)), the file system type must be
       specified. If it is not explicitly specified using the -F FSType command line option, the generic command looks in /etc/vfstab in order	to
       determine  the  file  system type, using the supplied raw or block device or mount point.  If the file system type can not be determined by
       searching /etc/vfstab, the command will use the default file system type specified in either /etc/default/fs or /etc/dfs/dfstypes,  depend-
       ing on whether the file system is local or remote.

       The default local file system type is specified in /etc/default/fs by a line of the form LOCAL=fstype (for example, LOCAL=ufs). The default
       remote file system type is determined by the first entry in the /etc/dfs/fstypes file.

       File system administration commands will determine whether the file system is local or remote by examining the specified device	name.	If
       the device  name starts with ``/'' (slash), it is considered to be local; otherwise it is remote.

       The default file system types can be changed by editing the default files with a text editor.

FILES

       /etc/vfstab	   list of default parameters for each file system

       /etc/default/fs	   the default local file system type

       /etc/dfs/fstypes    the default remote file system type

SEE ALSO

       fsck(1M), fstypes(4), vfstab(4)

SunOS 5.11							    20 Mar 1992 						     default_fs(4)
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