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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man5/proc_pid_root.5
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-.\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com>
-.\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org>
-.\"
-.\" SPDX-License-Identifier: GPL-3.0-or-later
-.\"
-.TH proc_pid_root 5 2023-08-15 "Linux man-pages 6.7"
-.SH NAME
-/proc/pid/root/ \- symbolic link to root directory
-.SH DESCRIPTION
-.TP
-.IR /proc/ pid /root/
-UNIX and Linux support the idea of a per-process root of the
-filesystem, set by the
-.BR chroot (2)
-system call.
-This file is a symbolic link that points to the process's
-root directory, and behaves in the same way as
-.IR exe ,
-and
-.IR fd/* .
-.IP
-Note however that this file is not merely a symbolic link.
-It provides the same view of the filesystem (including namespaces and the
-set of per-process mounts) as the process itself.
-An example illustrates this point.
-In one terminal, we start a shell in new user and mount namespaces,
-and in that shell we create some new mounts:
-.IP
-.in +4n
-.EX
-$ \fBPS1=\[aq]sh1# \[aq] unshare \-Urnm\fP
-sh1# \fBmount \-t tmpfs tmpfs /etc\fP # Mount empty tmpfs at /etc
-sh1# \fBmount \-\-bind /usr /dev\fP # Mount /usr at /dev
-sh1# \fBecho $$\fP
-27123
-.EE
-.in
-.IP
-In a second terminal window, in the initial mount namespace,
-we look at the contents of the corresponding mounts in
-the initial and new namespaces:
-.IP
-.in +4n
-.EX
-$ \fBPS1=\[aq]sh2# \[aq] sudo sh\fP
-sh2# \fBls /etc | wc \-l\fP # In initial NS
-309
-sh2# \fBls /proc/27123/root/etc | wc \-l\fP # /etc in other NS
-0 # The empty tmpfs dir
-sh2# \fBls /dev | wc \-l\fP # In initial NS
-205
-sh2# \fBls /proc/27123/root/dev | wc \-l\fP # /dev in other NS
-11 # Actually bind
- # mounted to /usr
-sh2# \fBls /usr | wc \-l\fP # /usr in initial NS
-11
-.EE
-.in
-.IP
-.\" The following was still true as at kernel 2.6.13
-In a multithreaded process, the contents of the
-.IR /proc/ pid /root
-symbolic link are not available if the main thread has already terminated
-(typically by calling
-.BR pthread_exit (3)).
-.IP
-Permission to dereference or read
-.RB ( readlink (2))
-this symbolic link is governed by a ptrace access mode
-.B PTRACE_MODE_READ_FSCREDS
-check; see
-.BR ptrace (2).
-.SH SEE ALSO
-.BR proc (5)