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| author |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-04-27 23:17:02 +0200 |
|---|---|---|
| committer |   Jonathan Corbet <corbet@lwn.net> | 2020-05-05 09:22:21 -0600 |
| commit | 01478b833176761e188a465fc7a22bd4e07d040e (patch) | |
| tree | f74c057b7150f5d66bd31c9b8d5910ff96402cb2 /Documentation/filesystems/devpts.txt | |
| parent | docs: filesystems: convert coda.txt to ReST (diff) | |
| download | linux-dev-01478b833176761e188a465fc7a22bd4e07d040e.tar.xz linux-dev-01478b833176761e188a465fc7a22bd4e07d040e.zip | |
docs: filesystems: convert devpts.txt to ReST
- Add a SPDX header;
- Add a document title;
- Some whitespace fixes and new line breaks;
- Mark literal blocks as such;
- Add it to filesystems/index.rst.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/4ac8f3a7edd4d817acf0d173ead7ef74fe010c6c.1588021877.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/filesystems/devpts.txt')
| -rw-r--r-- | Documentation/filesystems/devpts.txt | 26 |
1 files changed, 0 insertions, 26 deletions
diff --git a/Documentation/filesystems/devpts.txt b/Documentation/filesystems/devpts.txt deleted file mode 100644 index 9f94fe276dea..000000000000 --- a/Documentation/filesystems/devpts.txt +++ /dev/null @@ -1,26 +0,0 @@ -Each mount of the devpts filesystem is now distinct such that ptys -and their indicies allocated in one mount are independent from ptys -and their indicies in all other mounts. - -All mounts of the devpts filesystem now create a /dev/pts/ptmx node -with permissions 0000. - -To retain backwards compatibility the a ptmx device node (aka any node -created with "mknod name c 5 2") when opened will look for an instance -of devpts under the name "pts" in the same directory as the ptmx device -node. - -As an option instead of placing a /dev/ptmx device node at /dev/ptmx -it is possible to place a symlink to /dev/pts/ptmx at /dev/ptmx or -to bind mount /dev/ptx/ptmx to /dev/ptmx. If you opt for using -the devpts filesystem in this manner devpts should be mounted with -the ptmxmode=0666, or chmod 0666 /dev/pts/ptmx should be called. - -Total count of pty pairs in all instances is limited by sysctls: -kernel.pty.max = 4096 - global limit -kernel.pty.reserve = 1024 - reserved for filesystems mounted from the initial mount namespace -kernel.pty.nr - current count of ptys - -Per-instance limit could be set by adding mount option "max=<count>". -This feature was added in kernel 3.4 together with sysctl kernel.pty.reserve. -In kernels older than 3.4 sysctl kernel.pty.max works as per-instance limit. |