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tcflow(3C)		 Standard C Library Functions		    tcflow(3C)

NAME
       tcflow - suspend or restart the transmission or reception of data

SYNOPSIS
       #include <termios.h>

       int tcflow(int fildes, int action);

DESCRIPTION
       The tcflow() function suspends transmission or reception of data on the
       object referred to by fildes, depending on the  value  of  action.  The
       fildes argument is an open file descriptor associated with a terminal.

	 ·  If action is TCOOFF, output is suspended.

	 ·  If action is TCOON, suspended output is restarted.

	 ·  If	action is TCIOFF, the system transmits a STOP character, which
	    is intended to cause the terminal device to stop transmitting data
	    to the system.

	 ·  If	action is TCION, the system transmits a START character, which
	    is intended to cause the terminal  device  to  start  transmitting
	    data to the system.

       The default on the opening of a terminal file is that neither its input
       nor its output are suspended.

       Attempts to use tcflow() from a process which is a member  of  a	 back‐
       ground process group on a fildes associated with its controlling termi‐
       nal, will cause the process group to be sent a SIGTTOU signal.  If  the
       calling process is blocking or ignoring SIGTTOU signals, the process is
       allowed to perform the operation, and no signal is sent.

RETURN VALUES
       Upon successful completion, 0 is returned. Otherwise,  −1  is  returned
       and errno is set to indicate the error.

ERRORS
       The tcflow() function will fail if:

       EBADF	       The fildes argument is not a valid file descriptor.

       EINVAL	       The action argument is not a supported value.

       ENOTTY	       The file associated with fildes is not a terminal.

       The tcflow() function may fail if:

       EIO	       The  process  group of the writing process is orphaned,
		       and the writing process is  not	ignoring  or  blocking
		       SIGTTOU.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬───────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	     ATTRIBUTE VALUE	     │
       ├─────────────────────────────┼───────────────────────────────┤
       │Interface Stability	     │Standard			     │
       ├─────────────────────────────┼───────────────────────────────┤
       │MT-Level		     │MT-Safe, and Async-Signal-Safe │
       └─────────────────────────────┴───────────────────────────────┘

SEE ALSO
       tcsendbreak(3C), attributes(5), standards(5), termio(7I)

SunOS 5.10			  14 Aug 2002			    tcflow(3C)

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