TCSBRK(2const)                                                  TCSBRK(2const)

NAME
       TCSBRK, TCSBRKP, TIOCSBRK, TIOCCBRK - sending a break

LIBRARY
       Standard C library (libc, -lc)

SYNOPSIS
       #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
       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
       On success, 0 is returned.  On error, -1 is returned, and errno is set
       to indicate the error.

SEE ALSO
       ioctl(2), ioctl_tty(2)

Linux man-pages 6.9.1             2024-06-13                    TCSBRK(2const)