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46 .TH TCFLOW 3C "Aug 14, 2002"
48 tcflow \- suspend or restart the transmission or reception of data
54 \fBint\fR \fBtcflow\fR(\fBint\fR \fIfildes\fR, \fBint\fR \fIaction\fR);
60 The \fBtcflow()\fR function suspends transmission or reception of data on the
61 object referred to by \fIfildes\fR, depending on the value of \fIaction\fR. The
62 \fIfildes\fR argument is an open file descriptor associated with a terminal.
67 If \fIaction\fR is \fBTCOOFF\fR, output is suspended.
73 If \fIaction\fR is \fBTCOON\fR, suspended output is restarted.
79 If \fIaction\fR is \fBTCIOFF\fR, the system transmits a \fBSTOP\fR character,
80 which is intended to cause the terminal device to stop transmitting data to the
87 If \fIaction\fR is \fBTCION\fR, the system transmits a \fBSTART\fR character,
88 which is intended to cause the terminal device to start transmitting data to
93 The default on the opening of a terminal file is that neither its input nor its
97 Attempts to use \fBtcflow()\fR from a process which is a member of a background
98 process group on a \fIfildes\fR associated with its controlling terminal, will
99 cause the process group to be sent a \fBSIGTTOU\fR signal. If the calling
100 process is blocking or ignoring \fBSIGTTOU\fR signals, the process is allowed
101 to perform the operation, and no signal is sent.
105 Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is
106 returned and \fBerrno\fR is set to indicate the error.
110 The \fBtcflow()\fR function will fail if:
117 The \fIfildes\fR argument is not a valid file descriptor.
126 The \fIaction\fR argument is not a supported value.
135 The file associated with \fIfildes\fR is not a terminal.
140 The \fBtcflow()\fR function may fail if:
147 The process group of the writing process is orphaned, and the writing process
148 is not ignoring or blocking \fBSIGTTOU\fR.
154 See \fBattributes\fR(5) for descriptions of the following attributes:
162 ATTRIBUTE TYPE ATTRIBUTE VALUE
164 Interface Stability Standard
166 MT-Level MT-Safe, and Async-Signal-Safe
172 \fBtcsendbreak\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5),