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-rw-r--r--doc/guix.texi6
-rw-r--r--gnu/system/file-systems.scm14
2 files changed, 19 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 42e62d4648..7bc10dc566 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3084,6 +3084,12 @@ Manual}). Pseudo-terminals are used by terminal emulators such as
@command{xterm}.
@end defvr
+@defvr {Scheme Variable} %shared-memory-file-system
+This file system is mounted as @file{/dev/shm} and is used to support
+memory sharing across processes (@pxref{Memory-mapped I/O,
+@code{shm_open},, libc, The GNU C Library Reference Manual}).
+@end defvr
+
@defvr {Scheme Variable} %binary-format-file-system
The @code{binfmt_misc} file system, which allows handling of arbitrary
executable file types to be delegated to user space. This requires the
diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm
index 76460d95af..8700530a76 100644
--- a/gnu/system/file-systems.scm
+++ b/gnu/system/file-systems.scm
@@ -108,10 +108,22 @@
(create-mount-point? #t)
(options (string-append "gid=" (number->string %tty-gid) ",mode=620"))))
+(define %shared-memory-file-system
+ ;; Shared memory.
+ (file-system
+ (device "tmpfs")
+ (mount-point "/dev/shm")
+ (type "tmpfs")
+ (check? #f)
+ (flags '(no-suid no-dev))
+ (options "size=50%") ;TODO: make size configurable
+ (create-mount-point? #t)))
+
(define %base-file-systems
;; List of basic file systems to be mounted. Note that /proc and /sys are
;; currently mounted by the initrd.
(list %devtmpfs-file-system
- %pseudo-terminal-file-system))
+ %pseudo-terminal-file-system
+ %shared-memory-file-system))
;;; file-systems.scm ends here