tcsendbreak()

Assert a break condition over a communications line

Synopsis:

#include <termios.h>

int tcsendbreak( int fildes, 
                 int duration );

Arguments:

fildes: A file descriptor that's associated with the line that you want to assert the break on.
duration: The number of milliseconds that you want to break for.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The tcsendbreak() function asserts a break condition over the communication line associated with the opened file descriptor indicated by fildes.

The break condition lasts for at least duration milliseconds, or approximately 300 milliseconds if duration is zero. The system rounds the effective value of duration up to the next highest supported interval, which is typically a multiple of 100 milliseconds.

Returns:

0: Success.
-1: An error occurred (errno is set).

Errors:

EBADF: The argument fildes is invalid.
ENOSYS: The resource manager associated with fildes doesn't support this call.
ENOTTY: The argument fildes doesn't refer to a terminal device.

Examples:

#include <termios.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

int main( void )
  {
    int fd;

    fd = open( "/dev/ser1", O_RDWR );

    /* Send a 500 millisecond break */
    tcsendbreak( fd, 500 );

    close( fd );
    return EXIT_SUCCESS;
  }

Classification:

POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes