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TCSBRK(2const) — Linux manual page

TCSBRK(2const)TCSBRK(2const)

NAME        top

       TCSBRK, TCSBRKP, TIOCSBRK, TIOCCBRK - sending a break

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <asm/termbits.h>/* Definition ofT*BRK*constants */#include <sys/ioctl.h>int ioctl(intfd, TCSBRK, intarg);int ioctl(intfd, TCSBRKP, intarg);int ioctl(intfd, TIOCSBRK);int ioctl(intfd, TIOCCBRK);

DESCRIPTION        top

TCSBRKEquivalent totcsendbreak(fd, arg).              If the terminal is using asynchronous serial data              transmission, andarg is zero, then send a break (a stream              of zero bits) for between 0.25 and 0.5 seconds.  If the              terminal is not using asynchronous serial data              transmission, then either a break is sent, or the function              returns without doing anything.  Whenarg is nonzero,              nobody knows what will happen.              (SVr4, UnixWare, Solaris, and Linux treattcsendbreak(fd,arg) with nonzeroarg liketcdrain(fd).              SunOS treatsarg as a multiplier, and sends a stream of              bitsarg times as long as done for zeroarg.  DG/UX and AIX              treatarg (when nonzero) as a time interval measured in              milliseconds.  HP-UX ignoresarg.)TCSBRKP              So-called "POSIX version" ofTCSBRK.  It treats nonzeroarg              as a time interval measured in deciseconds, and does              nothing when the driver does not support breaks.TIOCSBRK              Turn break on, that is, start sending zero bits.TIOCCBRK              Turn break off, that is, stop sending zero bits.

RETURN VALUE        top

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

SEE ALSO        top

ioctl(2),ioctl_tty(2)

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            2025-05-17TCSBRK(2const)

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