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28 .\" @(#)tcsendbreak.3 8.1 (Berkeley) 6/4/93
39 .Nd line control functions
47 .Fn tcflow "int fd" "int action"
49 .Fn tcflush "int fd" "int action"
51 .Fn tcsendbreak "int fd" "int len"
55 function waits until all output written to the terminal referenced by
57 has been transmitted to the terminal.
61 function suspends transmission of data to or the reception of data from
62 the terminal referenced by
64 depending on the value of
68 must be one of the following:
69 .Bl -tag -width "TCIOFF"
73 Restart suspended output.
75 Transmit a STOP character, which is intended to cause the terminal to stop
76 transmitting data to the system.
77 (See the description of IXOFF in the
82 Transmit a START character, which is intended to cause the terminal to start
83 transmitting data to the system.
84 (See the description of IXOFF in the
92 function discards any data written to the terminal referenced by
94 which has not been transmitted to the terminal, or any data received
95 from the terminal but not yet read, depending on the value of
99 must be one of the following:
100 .Bl -tag -width "TCIOFLUSH"
102 Flush data received but not read.
104 Flush data written but not transmitted.
106 Flush both data received but not read and data written but not transmitted.
111 function transmits a continuous stream of zero-valued bits for four-tenths
112 of a second to the terminal referenced by
116 argument is ignored in this implementation.
118 Upon successful completion, all of these functions return a value of zero.
120 If any error occurs, a value of -1 is returned and the global variable
122 is set to indicate the error, as follows:
127 argument is not a valid file descriptor.
131 argument is not a proper value.
133 The file associated with
137 A signal interrupted the
151 functions are expected to be compliant with the