tcflow - Perform flow control functions
int action );
Standard C Library (libc)
Interfaces documented on this reference page conform to
industry standards as follows:
tcflow(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information
about industry standards and associated tags.
Specifies an open file descriptor. Specifies one of the
following: Suspend output. Restart suspended output.
Transmit a STOP character, which is intended to cause the
terminal device to stop transmitting data to the system.
Transmit a START character, which is intended to cause the
terminal device to start transmitting data to the system.
The tcflow() function suspends transmission or reception
of data on the object referred to by the filedes parameter,
depending on the value of the action parameter.
A process group is sent a SIGTTOU signal if the tcflow()
function is called from one of its member processes. If
the calling process is blocking or ignoring SIGTTOU signals,
the process is allowed to perform the operation and
no signal is sent.
Upon successful completion, a value of 0 (zero) is
returned. Otherwise, a value of -1 is returned and errno
is set to indicate the error.
The tcflow() function sets errno to the specified values
for the following conditions:
The filedes parameter does not specify a valid file
descriptor. The action parameter is not a supported
value. The file associated with the filedes parameter is
not a terminal.
Functions: tcdrain(3), tcflush(3), tcsendbreak(3)
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