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FDESCFS(5)		    BSD	File Formats Manual		    FDESCFS(5)

NAME
     fdescfs --	file-descriptor	file system

SYNOPSIS
     fdescfs /dev/fd fdescfs rw	0 0

DESCRIPTION
     The file-descriptor file system, or fdescfs, provides access to the per-
     process file descriptor namespace in the global file system namespace.
     The conventional mount point is /dev/fd.

     The file system's contents	appear as a list of numbered files which cor-
     respond to	the open files of the process reading the directory.  The
     files /dev/fd/0 through /dev/fd/# refer to	file descriptors which can be
     accessed through the file system.	If the file descriptor is open and the
     mode the file is being opened with	is a subset of the mode	of the exist-
     ing descriptor, the call:

	   fd =	open("/dev/fd/0", mode);

     and the call:

	   fd =	fcntl(0, F_DUPFD, 0);

     are equivalent.

     Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR	are
     ignored.

FILES
     /dev/fd/#

SEE ALSO
     mount_devfs(8), mount_fdescfs(8)

HISTORY
     The fdescfs file system first appeared in 4.4BSD.	The fdescfs manual
     page first	appeared in FreeBSD 2.2.

AUTHORS
     The fdescfs manual	page was written by Mike Pritchard <mpp@FreeBSD.org>,
     and was based on the mount_fdescfs(8) manual page written by Jan-Simon
     Pendry.

BSD			       December	14, 1996			   BSD

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | AUTHORS

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