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TIOCSLCKTRMIOS(2const) — Linux manual page

TIOCSLCKTRMIOS(2const)TIOCSLCKTRMIOS(2const)

NAME        top

       TIOCGLCKTRMIOS, TIOCSLCKTRMIOS - locking the termios structre

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <asm/termbits.h>/* Definition ofTIOC*CLKTRMIOSconstants */#include <sys/ioctl.h>int ioctl(intfd, TIOCGLCKTRMIOS, struct termios *argp);int ioctl(intfd, TIOCSLCKTRMIOS, const struct termios *argp);#include <asm/termbits.h>struct termios;

DESCRIPTION        top

       Thetermios structure of a terminal can be locked.  The lock is       itself atermios structure, with nonzero bits or fields indicating       a locked value.TIOCGLCKTRMIOS              Gets the locking status of thetermios structure of the              terminal.TIOCSLCKTRMIOS              Sets the locking status of thetermios structure of the              terminal.  Only a process with theCAP_SYS_ADMINcapability              can do this.

RETURN VALUE        top

       On success, 0 is returned.  On error, -1 is returned, anderrno is       set to indicate the error.

ERRORS        top

EPERMInsufficient permission.

CAVEATS        top

       Please note thatstruct termiosfrom<asm/termbits.h> is different       and incompatible withstruct termiosfrom<termios.h>.  These       ioctl calls requirestruct termiosfrom<asm/termbits.h>.

SEE ALSO        top

ioctl(2),ioctl_tty(2),TCSETS(2const)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17TIOCSLCKTRMIOS(2const)

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