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)