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)