@node tcflow, termios
@subheading Syntax

@example
#include <termios.h>

int tcflow (int fd, int action);
@end example

@subheading Description

This function suspends transmission of data to, or reception of data
from, the device/file open on handle @var{fd}.  The @var{action}
argument can take one of these values:

@table @code
@item TCOOFF
the output is suspended
@item TCOON
the output is resumed
@item TCIOFF
the STOP character is transmitted
@item TCION
the START character is transmitted
@end table

The current START and STOP characters are stored in the @code{termios}
structure that is currently in effect.  @xref{Termios functions}, for
more details about that.

Note that the DJGPP termios emulation handles console only.

@subheading Return Value

Zero on success, nonzero on failure.



@subheading Portability

@portability !ansi, posix