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@(#)tcsendbreak.3 8.1 (Berkeley) 6/4/93
$FreeBSD: releng/10.2/lib/libc/gen/tcsendbreak.3 165903 2007-01-09 00:28:16Z imp $
.Dd June 4, 1993 .Dt TCSENDBREAK 3 .Os .Sh NAME .Nm tcsendbreak , .Nm tcdrain , .Nm tcflush , .Nm tcflow .Nd line control functions .Sh LIBRARY .Lb libc .Sh SYNOPSIS n termios.h .Ft int .Fn tcdrain "int fd" .Ft int .Fn tcflow "int fd" "int action" .Ft int .Fn tcflush "int fd" "int action" .Ft int .Fn tcsendbreak "int fd" "int len" .Sh DESCRIPTION The .Fn tcdrain function waits until all output written to the terminal referenced by .Fa fd has been transmitted to the terminal.
p The .Fn tcflow function suspends transmission of data to or the reception of data from the terminal referenced by .Fa fd depending on the value of .Fa action . The value of .Fa action must be one of the following: l -tag -width "TCIOFF" t Fa TCOOFF Suspend output. t Fa TCOON Restart suspended output. t Fa TCIOFF Transmit a STOP character, which is intended to cause the terminal to stop transmitting data to the system. (See the description of IXOFF in the .Ql Input Modes section of .Xr termios 4 ) . t Fa TCION Transmit a START character, which is intended to cause the terminal to start transmitting data to the system. (See the description of IXOFF in the .Ql Input Modes section of .Xr termios 4 ) . .El
p The .Fn tcflush function discards any data written to the terminal referenced by .Fa fd which has not been transmitted to the terminal, or any data received from the terminal but not yet read, depending on the value of .Fa action . The value of .Fa action must be one of the following: l -tag -width "TCIOFLUSH" t Fa TCIFLUSH Flush data received but not read. t Fa TCOFLUSH Flush data written but not transmitted. t Fa TCIOFLUSH Flush both data received but not read and data written but not transmitted. .El
p The .Fn tcsendbreak function transmits a continuous stream of zero-valued bits for four-tenths of a second to the terminal referenced by .Fa fd . The .Fa len argument is ignored in this implementation. .Sh RETURN VALUES Upon successful completion, all of these functions return a value of zero. .Sh ERRORS If any error occurs, a value of -1 is returned and the global variable .Va errno is set to indicate the error, as follows: l -tag -width Er t Bq Er EBADF The .Fa fd argument is not a valid file descriptor. t Bq Er EINVAL The .Fa action argument is not a proper value. t Bq Er ENOTTY The file associated with .Fa fd is not a terminal. t Bq Er EINTR A signal interrupted the .Fn tcdrain function. .El .Sh SEE ALSO .Xr tcsetattr 3 , .Xr termios 4 .Sh STANDARDS The .Fn tcsendbreak , .Fn tcdrain , .Fn tcflush and .Fn tcflow functions are expected to be compliant with the .St -p1003.1-88 specification.