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10 .TH TCFLOW 3C "Aug 14, 2002"
12 tcflow \- suspend or restart the transmission or reception of data
18 \fBint\fR \fBtcflow\fR(\fBint\fR \fIfildes\fR, \fBint\fR \fIaction\fR);
24 The \fBtcflow()\fR function suspends transmission or reception of data on the
25 object referred to by \fIfildes\fR, depending on the value of \fIaction\fR. The
26 \fIfildes\fR argument is an open file descriptor associated with a terminal.
31 If \fIaction\fR is \fBTCOOFF\fR, output is suspended.
37 If \fIaction\fR is \fBTCOON\fR, suspended output is restarted.
43 If \fIaction\fR is \fBTCIOFF\fR, the system transmits a \fBSTOP\fR character,
44 which is intended to cause the terminal device to stop transmitting data to the
51 If \fIaction\fR is \fBTCION\fR, the system transmits a \fBSTART\fR character,
52 which is intended to cause the terminal device to start transmitting data to
57 The default on the opening of a terminal file is that neither its input nor its
61 Attempts to use \fBtcflow()\fR from a process which is a member of a background
62 process group on a \fIfildes\fR associated with its controlling terminal, will
63 cause the process group to be sent a \fBSIGTTOU\fR signal. If the calling
64 process is blocking or ignoring \fBSIGTTOU\fR signals, the process is allowed
65 to perform the operation, and no signal is sent.
69 Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is
70 returned and \fBerrno\fR is set to indicate the error.
74 The \fBtcflow()\fR function will fail if:
81 The \fIfildes\fR argument is not a valid file descriptor.
90 The \fIaction\fR argument is not a supported value.
99 The file associated with \fIfildes\fR is not a terminal.
104 The \fBtcflow()\fR function may fail if:
111 The process group of the writing process is orphaned, and the writing process
112 is not ignoring or blocking \fBSIGTTOU\fR.
118 See \fBattributes\fR(5) for descriptions of the following attributes:
126 ATTRIBUTE TYPE ATTRIBUTE VALUE
128 Interface Stability Standard
130 MT-Level MT-Safe, and Async-Signal-Safe
136 \fBtcsendbreak\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5),