tcflow(3p) [suse man page]
TCFLOW(3P) POSIX Programmer's Manual TCFLOW(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. 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 shall suspend or restart 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 shall be suspended. * If action is TCOON, suspended output shall be restarted. * If action is TCIOFF, the system shall transmit a STOP character, which is intended to cause the terminal device to stop transmitting data to the system. * If action is TCION, the system shall transmit 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 background process group on a fildes associated with its controlling termi- nal, shall cause the process group to be sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU signals, the process shall be allowed to perform the operation, and no signal is sent. RETURN VALUE
Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno set to indicate the error. ERRORS
The tcflow() function shall 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. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
tcsendbreak(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface, <termios.h>, <unistd.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 TCFLOW(3P)
Check Out this Related Man Page
TCFLOW(3P) POSIX Programmer's Manual TCFLOW(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. 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 shall suspend or restart 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 shall be suspended. * If action is TCOON, suspended output shall be restarted. * If action is TCIOFF and fildes 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. If fildes is associated with a pseudo-terminal, the STOP character need not be transmitted. * If action is TCION and fildes 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. If fildes 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 use tcflow() from a process which is a member of a background process group on a fildes associated with its controlling termi- nal, shall cause the process group to be sent a SIGTTOU signal. If the calling thread is blocking SIGTTOU signals or the process is ignor- ing SIGTTOU signals, the process shall be allowed to perform the operation, and no signal is sent. RETURN VALUE
Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno set to indicate the error. ERRORS
The tcflow() function shall fail if: EBADF The fildes argument is not a valid file descriptor. EINVAL The action argument is not a supported value. EIO The process group of the writing process is orphaned, the calling thread is not blocking SIGTTOU, and the process is not ignoring SIGTTOU. ENOTTY The file associated with fildes is not a terminal. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
tcsendbreak() The Base Definitions volume of POSIX.1-2008, Chapter 11, General Terminal Interface, <termios.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan- dard is the referee document. The original Standard can be obtained online at http://www.unix.org/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, see https://www.kernel.org/doc/man-pages/reporting_bugs.html . IEEE
/The Open Group 2013 TCFLOW(3P)