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46 .TH TCFLUSH 3C "Aug 14, 2002"
48 tcflush \- flush non-transmitted output data, non-read input data or both
54 \fBint\fR \fBtcflush\fR(\fBint\fR \fIfildes\fR, \fBint\fR \fIqueue_selector\fR);
60 Upon successful completion, \fBtcflush()\fR discards data written to the object
61 referred to by \fIfildes\fR (an open file descriptor associated with a
62 terminal) but not transmitted, or data received but not read, depending on the
63 value of \fIqueue_selector\fR:
68 If \fIqueue_selector\fR is \fBTCIFLUSH\fR it flushes data received but not
75 If \fIqueue_selector\fR is \fBTCOFLUSH\fR it flushes data written but not
82 If \fIqueue_selector\fR is \fBTCIOFLUSH\fR it flushes both data received but
83 not read and data written but not transmitted.
87 Attempts to use \fBtcflush()\fR from a process which is a member of a
88 background process group on a \fIfildes\fR associated with its controlling
89 terminal, will cause the process group to be sent a \fBSIGTTOU\fR signal. If
90 the calling process is blocking or ignoring \fBSIGTTOU\fR signals, the process
91 is allowed to perform the operation, and no signal is sent.
95 Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is
96 returned and \fBerrno\fR is set to indicate the error.
100 The \fBtcflush()\fR function will fail if:
107 The \fIfildes\fR argument is not a valid file descriptor.
116 The \fIqueue_selector\fR argument is not a supported value.
125 The file associated with \fIfildes\fR is not a terminal.
130 The \fBtcflush()\fR function may fail if:
137 The process group of the writing process is orphaned, and the writing process
138 is not ignoring or blocking \fBSIGTTOU\fR.
144 See \fBattributes\fR(5) for descriptions of the following attributes:
152 ATTRIBUTE TYPE ATTRIBUTE VALUE
154 Interface Stability Standard
156 MT-Level MT-Safe, and Async-Signal-Safe
162 \fBtcdrain\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5), \fBtermio\fR(7I)