MOUNT_PTYFS(8) BSD System Manager's Manual MOUNT_PTYFS(8)NAME
mount_ptyfs -- mount the /dev/pts file system
SYNOPSIS
mount_ptyfs [-g group|gid] [-m mode] [-o options] ptyfs mount_point
DESCRIPTION
The mount_ptyfs command attaches an instance of the pseudo-terminal device filesystem to the global filesystem namespace. The conventional
mount point is /dev/pts. The directory specified by mount_point is converted to an absolute path before use. This command is normally exe-
cuted by mount(8) at boot time.
The filesystem contains pseudo-terminal slave device nodes which are allocated dynamically via ptm(4), or they are already open via tradi-
tional BSD style ptys.
The options are as follows:
-g group|gid
Specify the group ownership of the slave pseudo-tty.
-m mode
Specify the default mode of the slave pseudo-tty.
-o Options are specified with a -o flag followed by a comma separated string of options.
mount_ptyfs specific options are group which corresponds to -g, and mode which corresponds to -m. See the mount(8) man page for pos-
sible options and their meanings.
FILES
n The nth pseudo-terminal device in use.
SEE ALSO mount(2), unmount(2), ptm(4), fstab(5), mount(8)HISTORY
The mount_ptyfs utility first appeared in NetBSD 3.0.
BUGS
When multiple instances are mounted, they all display the union of the ptys used in each instance, not just the ones used in the particular
instance.
BSD September 19, 2012 BSD
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MOUNT_FDESC(8) BSD System Manager's Manual MOUNT_FDESC(8)NAME
mount_fdesc -- mount the file-descriptor file system
SYNOPSIS
mount_fdesc [-o options] fdesc mount_point
DESCRIPTION
The mount_fdesc command attaches an instance of the per-process file descriptor namespace to the global filesystem namespace. The conven-
tional mount point is /dev and the filesystem should be union mounted in order to augment, rather than replace, the existing entries in /dev.
The directory specified by mount_point is converted to an absolute path before use.
This command is normally executed by mount(8) at boot time.
The options are as follows:
-o Options are specified with a -o flag followed by a comma separated string of options. See the mount(8) man page for possible options
and their meanings.
The contents of the mount point are fd, stderr, stdin, stdout and tty.
fd is a directory whose contents appear as a list of numbered files which correspond 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 existing descriptor, the call:
fd = open("/dev/fd/0", mode);
and the call:
fd = fcntl(0, F_DUPFD, 0);
are equivalent.
The files /dev/stdin, /dev/stdout and /dev/stderr appear as symlinks to the relevant entry in the /dev/fd sub-directory. Opening them is
equivalent to the following calls:
fd = fcntl(STDIN_FILENO, F_DUPFD, 0);
fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR are ignored.
The /dev/tty entry is an indirect reference to the current process's controlling terminal. It appears as a named pipe (FIFO) but behaves in
exactly the same way as the real controlling terminal device.
FILES
/dev/fd/#
/dev/stdin
/dev/stdout
/dev/stderr
/dev/tty
SEE ALSO mount(2), unmount(2), tty(4), fstab(5), mount(8)HISTORY
The mount_fdesc utility first appeared in 4.4BSD.
BUGS
This filesystem may not be NFS-exported.
BSD March 27, 1994 BSD