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fdescfs
FDESCFS(5) FreeBSD 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 <mppATFreeBSD.org>,
and was based on the mount_fdescfs(8) manual page written by Jan-Simon
Pendry.
FreeBSD 6.2 December 14, 1996 FreeBSD 6.2
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