TCSBRK(2const) - Linux manual page (original) (raw)

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 of **T*BRK*** constants */
   **#include <sys/ioctl.h>**

   **int ioctl(int** _fd_**, TCSBRK, int** _arg_**);**
   **int ioctl(int** _fd_**, TCSBRKP, int** _arg_**);**
   **int ioctl(int** _fd_**, TIOCSBRK);**
   **int ioctl(int** _fd_**, TIOCCBRK);**

DESCRIPTION top

   **TCSBRK** Equivalent to _tcsendbreak(fd, arg)_.

          If the terminal is using asynchronous serial data
          transmission, and _arg_ 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.  When _arg_ is nonzero,
          nobody knows what will happen.

          (SVr4, UnixWare, Solaris, and Linux treat
          _tcsendbreak(fd,arg)_ with nonzero _arg_ like _tcdrain(fd)_.
          SunOS treats _arg_ as a multiplier, and sends a stream of
          bits _arg_ times as long as done for zero _arg_.  DG/UX and AIX
          treat _arg_ (when nonzero) as a time interval measured in
          milliseconds.  HP-UX ignores _arg_.)

   **TCSBRKP**
          So-called "POSIX version" of **TCSBRK**.  It treats nonzero _arg_
          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, and _[errno](../man3/errno.3.html)_ is
   set to indicate the error.

SEE ALSO top

   [ioctl(2)](../man2/ioctl.2.html), [ioctl_tty(2)](../man2/ioctl%5Ftty.2.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 TCSBRK(2const)

Pages that refer to this page:ioctl_tty(2)