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tcflow(3p) — Linux manual page

PROLOG \|NAME \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|EXAMPLES \|APPLICATION USAGE \|RATIONALE \|FUTURE DIRECTIONS \|SEE ALSO \|COPYRIGHT

TCFLOW(3P)              POSIX Programmer's ManualTCFLOW(3P)

PROLOG top

       This manual page is part of the POSIX Programmer's Manual.  The       Linux implementation of this interface may differ (consult the       corresponding Linux manual page for details of Linux behavior), or       the interface may not be implemented on Linux.

NAME top

       tcflow — suspend or restart the transmission or reception of data

SYNOPSIS top

       #include <termios.h>       int tcflow(intfildes, intaction);

DESCRIPTION top

Thetcflow() function shall suspend or restart transmission or reception of data on the object referred to byfildes, depending on the value ofaction. Thefildes argument is an open file descriptor associated with a terminal. * Ifaction is TCOOFF, output shall be suspended. * Ifaction is TCOON, suspended output shall be restarted. * Ifaction is TCIOFF andfildes refers to a terminal device, the system shall transmit a STOP character, which is intended to cause the terminal device to stop transmitting data to the system. Iffildes is associated with a pseudo-terminal, the STOP character need not be transmitted. * Ifaction is TCION andfildes refers to a terminal device, the system shall transmit a START character, which is intended to cause the terminal device to start transmitting data to the system. Iffildes is associated with a pseudo-terminal, the START character need not be transmitted. The default on the opening of a terminal file is that neither its input nor its output are suspended. Attempts to usetcflow() from a process which is a member of a background process group on afildes associated with its controlling terminal, shall cause the process group to be sent a SIGTTOU signal. If the calling thread is blocking SIGTTOU signals or the process is ignoring SIGTTOU signals, the process shall be allowed to perform the operation, and no signal is sent.

RETURN VALUE top

       Upon successful completion, 0 shall be returned. Otherwise, -1       shall be returned anderrno set to indicate the error.

ERRORS top

       Thetcflow() function shall fail if:EBADFThefildes argument is not a valid file descriptor.EINVALTheaction argument is not a supported value.EIOThe process group of the writing process is orphaned, the              calling thread is not blocking SIGTTOU, and the process is              not ignoring SIGTTOU.ENOTTYThe file associated withfildes is not a terminal.The following sections are informative.

EXAMPLES top

       None.

APPLICATION USAGE top

       None.

RATIONALE top

       None.

FUTURE DIRECTIONS top

       None.

COPYRIGHT top

       Portions of this text are reprinted and reproduced in electronic       form from IEEE Std 1003.1-2017, Standard for Information       Technology -- Portable Operating System Interface (POSIX), The       Open Group Base Specifications Issue 7, 2018 Edition, Copyright       (C) 2018 by the Institute of Electrical and Electronics Engineers,       Inc and The Open Group.  In the event of any discrepancy between       this version and the original IEEE and The Open Group Standard,       the original IEEE and The Open Group Standard is the referee       document. The original Standard can be obtained online athttp://www.opengroup.org/unix/online.html .       Any typographical or formatting errors that appear in this page       are most likely to have been introduced during the conversion of       the source files to man page format. To report such errors, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017TCFLOW(3P)

Pages that refer to this page:termios.h(0p)

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