Vist the man page in this following order : C-x RET c utf-8 RET M-x man RET memset RET The following is the output: MEMSET(3) Linux Programmer's Manual MEMSET(3) NAME memset - fill memory with a constant byte SYNOPSIS #include void *memset(void *s, int c, size_t n); DESCRIPTION The memset() function fills the first n bytes of the memory area pointed to by s with the constant byte c. RETURN VALUE The memset() function returns a pointer to the memory area s. ATTRIBUTES For an explanation of the terms used in this section, see atâ€â€ tributes(7). ┌──────────┬───────────────┬─────────┠│Interface │ Attribute │ Value │ ├──────────┼───────────────┼─────────┤ │memset() │ Thread safety │ MT-Safe │ └──────────┴───────────────┴─────────┘ CONFORMING TO POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD. SEE ALSO bstring(3), bzero(3), swab(3), wmemset(3) COLOPHON This page is part of release 5.05 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU 2017-03-13 MEMSET(3) In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, cairo version 1.16.0) of 2021-07-17 built on electriphi Repository revision: 109c27341e35fae778b95e0eb5d4d72927bf4ea8 Repository branch: master Windowing system distributor 'The X.Org Foundation', version 11.0.12009000 System Description: Ubuntu 20.04.2 LTS Configured using: 'configure --with-modules --with-json --with-mailutils --with-gnutls --with-json --with-harfbuzz --with-imagemagick --with-jpeg --with-png --with-rsvg --with-tiff --with-wide-int --with-xft --with-xml2 --with-xpm --without-compress-install --with-x-toolkit=no --with-gnutls --without-gconf --without-xwidgets --without-toolkit-scroll-bars --without-xaw3d --without-gsettings --with-mailutils --with-native-compilation prefix=/usr/local 'CFLAGS=-ggdb3 -O0 -march=native -fomit-frame-pointer' LDFLAGS=-ggdb3' Configured features: CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ IMAGEMAGICK JPEG JSON LCMS2 LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY OLDXMENU PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF X11 XDBE XIM XPM ZLIB Important settings: value of $LANG: en_IN value of $XMODIFIERS: @im=ibus locale-coding-system: iso-latin-1-unix Major mode: Lisp Interaction Minor modes in effect: recentf-mode: t dap-tooltip-mode: t dap-ui-many-windows-mode: t dap-ui-controls-mode: t dap-ui-mode: t treemacs-filewatch-mode: t treemacs-follow-mode: t treemacs-git-mode: deferred treemacs-fringe-indicator-mode: t edebug-mode: t dap-auto-configure-mode: t dap-mode: t rainbow-delimiters-mode: t global-emojify-mode: t emojify-mode: t global-hl-line-mode: t editorconfig-mode: t global-auto-revert-mode: t projectile-mode: t which-key-mode: t helm-mode: t shell-dirtrack-mode: t helm--remap-mouse-mode: t async-bytecomp-package-mode: t yas-global-mode: t yas-minor-mode: t override-global-mode: t tooltip-mode: t global-eldoc-mode: t eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t file-name-shadow-mode: t global-font-lock-mode: t 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